7641 Cteatus: Difference between revisions
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{{Infobox planet |
{{Infobox planet |
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|minorplanet=yes |
| minorplanet = yes |
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| name = 7641 Cteatus |
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|name=(7641) 1986 TT<sub>6</sub> |
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|background=# |
| background = #C2FFFF |
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| image = |
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|image=[[File:Orbit of 7641.gif|300px]] |
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| image_size = |
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|caption=The highly inclined orbit of 1986 TT<sub>6</sub> |
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| caption = |
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|discoverer=[[Milan Antal|M. Antal]] |
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| discovery_ref =  <ref name="MPC-object" /> |
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|discovered=5 October 1986 |
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| discoverer = [[Milan Antal|M. Antal]] |
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|discovery_site=''Piwince'' |
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| discovery_site = [[Toruń Centre for Astronomy|Toruń–Piwnice]] |
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|alt_names=1975 VT<sub>5</sub>, 1975 XS<sub>4</sub>, 1986 VP<sub>5</sub>, 1991 HY, 1996 RN<sub>26</sub><ref name= "MPC" /> |
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| discovered = 5 October 1986 |
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|orbit_ref=<ref name="MPC">{{cite web | url=http://www.minorplanetcenter.net/db_search/show_object?object_id=7641&commit=Show | title=(7641) | publisher=International Astronomical Union | work=Minor Planet Center | accessdate=31 December 2013}}</ref><ref name = "JPL SBDB" /> |
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| mpc_name = (7641) Cteatus |
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|aphelion={{Convert|5.4925|AU|Gm|abbr=on|lk=on}} |
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| alt_names = {{mp|1986 TT|6}}{{·}}{{mp|1975 VT|5}}<br />{{mp|1975 XS|4}}{{·}}{{mp|1986 VP|5}}<br />1991 HY{{·}}{{mp|1996 RN|26}} |
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|perihelion={{Convert|4.9387|AU|Gm|abbr=on}} |
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| adjective = Cteatian |
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|semimajor={{Convert|5.2156|AU|Gm|abbr=on}} |
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| pronounced = |
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|eccentricity=0.053089 |
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| named_after = [[Cteatus]] <ref name="WGSBN-Bulletin-Archive" /><br />{{small|(Greek mythology)}} |
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|period=11.91 [[Julian year (astronomy)|yr]] (4350.63 [[Julian year (astronomy)|d]]) |
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| mp_category = [[Jupiter trojan]] <ref name="MPC-object" /><ref name="jpldata" /><ref name="lcdb" /><br />{{nowrap|[[Greek camp|Greek]] <ref name="MPC-Jupiter-Trojans" /><ref name="AstDys-object" />{{·}}[[Background asteroid|background]] <ref name="AstDys-object" />}} |
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|inclination=34.696° |
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| orbit_ref =  <ref name="jpldata" /> |
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|asc_node=242.06° |
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| epoch = 23 March 2018 ([[Julian day|JD]] 2458200.5) |
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|arg_peri=229.49° |
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| uncertainty = 0 |
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|mean_anomaly=104.73[[Degree (angle)|°]] |
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| observation_arc = 42.54 [[Julian year (astronomy)|yr]] (15,539 d) |
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|p_mean_motion=30.222 |
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| aphelion = 5.4898 [[Astronomical unit|AU]] |
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|single_temperature=121 K (-152°C) |
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| perihelion = 4.9398 AU |
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|abs_magnitude=9.3<ref name = "JPL SBDB" /> |
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| semimajor = 5.2148 AU |
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|rotation={{Convert|27.770|h|d|abbr=on|lk=on}}<ref name = "JPL SBDB" /> |
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| eccentricity = 0.0527 |
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|dimensions={{convert|68.97|km|mi|abbr=on}} <ref name = "JPL SBDB" /> |
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| period = 11.91 yr (4,350 d) |
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|albedo=0.0708 ± 0.007<ref name = "JPL SBDB" /> |
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| mean_anomaly = 171.71[[Degree (angle)|°]] |
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|epoch=13 January 2016 ([[Julian day|JD]] 2457400.5) |
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|mean_motion={{Deg2DMS|0. |
| mean_motion = {{Deg2DMS|0.0828|sup=ms}} / day |
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| inclination = 34.693° |
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|mean_radius=34.485 ± 1.6 km |
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| asc_node = 242.06° |
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|observation_arc=14746 days (40.37 yr) |
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| arg_peri = 228.81° |
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|uncertainty=0 |
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| jupiter_moid = 0.0165 AU |
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|moid={{Convert|4.00943|AU|Gm|abbr=on}} |
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| tisserand = 2.6420 |
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|jupiter_moid={{Convert|0.0108327|AU|Gm|abbr=on}} |
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| mean_diameter = {{val|68.89|ul=km}} {{small|(derived)}}<ref name="lcdb" /><br />{{val|68.97|3.2|u=km }}<ref name="SIMPS" /><br />{{val|71.84|1.64|u=km}}<ref name="Grav-2012" /><br />{{val|75.28|2.43|u=km}}<ref name="AKARI" /> |
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| rotation = {{val|27.770|0.013|ul=h}}<ref name="Mottola-2011" /> |
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| albedo = {{val|0.062|0.005}}<ref name="AKARI" /><br />{{val|0.0647}} {{small|(derived)}}<ref name="lcdb" /><br />{{val|0.065|0.011}}<ref name="Grav-2012" /><br />{{val|0.0708|0.007}}<ref name="SIMPS" /> |
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| spectral_type = [[D-type asteroid|D]] {{small|([[Pan-STARRS]])}}<ref name="Veres-2015" /><br />[[D-type asteroid|D]] {{small|([[Sloan Digital Sky Survey|SDSS]]-MOC)}}<ref name="SDSS-Taxonomy" /><br />[[D-type asteroid|C]] {{small|(assumed)}}<ref name="lcdb" /><br />[[Asteroid color indices|V–I]] {{=}} {{val|0.980|0.035}}<ref name="lcdb" /> |
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| abs_magnitude = {{val|9.09|0.41}}<ref name="Veres-2015" /><br />9.30<ref name="SIMPS" /><ref name="Grav-2012" /><ref name="AKARI" /><br />9.4<ref name="MPC-object" /><ref name="jpldata" /><ref name="lcdb" /> |
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}} |
}} |
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'''7641 Cteatus''', [[Minor planet provisional designation|''provisional designation'']]: {{mp|1986 TT|6}}, is a large [[Jupiter trojan]] from the [[Greek camp]], approximately {{convert|70|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 5 October 1986, by Slovak astronomer [[Milan Antal]] at the [[Toruń Centre for Astronomy]] in Piwnice, Poland.<ref name="MPC-object" /> The dark [[D-type asteroid]] is notably [[orbital inclination|inclined]] and has longer-than-average [[rotation period]] of 27.8 hours.<ref name="lcdb" /> It belongs to the [[#Largest Jupiter trojans|50 largest Jupiter trojans]]. It was named from Greek mythology for [[Cteatus]], the conjoined twin and father of [[Amphimachus I of Elis|Amphimachus]].<ref name="WGSBN-Bulletin-Archive" /> |
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'''(7641) 1986 TT<sub>6</sub>''' is a [[Jupiter Trojan]] asteroid in the [[Greek camp]] (L<sub>4</sub> [[Lagrangian Point]]). It was discovered on October 5, 1986, at the [[Piwince Observatory]] by [[Milan Antal]].<ref name = "JPL SBDB">{{cite sbdb|title=7641 (1986 TT6)|id=2007641|access-date=4 April 2016}}</ref> |
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== Orbit and classification == |
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==Physical Characteristics== |
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[[File:Orbit of 7641.gif|thumb|200px|left|Inclined orbit of ''Cteatus'']] |
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(7641) 1986 TT<sub>6</sub> is a medium-sized asteroid. It has an unusually slow rotation of 22.77 hours. Its low albedo suggests that it is a carbonaceous asteroid.<ref>{{cite book |title=The Cambridge Encyclopedia of Meteorites |last=Norton |first=O. Richard |year=2002 |publisher=Cambridge University Press |location=Cambridge |isbn=0-521-62143-7}}</ref> |
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''Cteatus'' is a dark Jovian [[asteroid]] orbiting in the leading Greek camp at Jupiter's {{L4}} [[Lagrangian point]], 60[[degree (angle)|°]] ahead of its orbit in a [[Orbital resonance|1:1 resonance]] ''(see [[Trojans in astronomy]])''. It is also a non-[[Asteroid family|family]] asteroid in the [[background asteroid|Jovian background population]].<ref name="AstDys-object" /><ref name="Ferret" /> |
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==References== |
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{{Reflist}} |
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It orbits the Sun at a distance of 4.9–5.5 [[Astronomical unit|AU]] once every 11 years and 11 months (4,350 days; [[semi-major axis]] of 5.21 AU). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.05 and a notably high [[orbital inclination|inclination]] of 35[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The asteroid was first observed as ''{{mp|1975 VT|5}}'' at [[Crimea–Nauchnij]] in November 1975. The body's [[observation arc]] begins with its official discovery observation at the Toruń Centre.<ref name="MPC-object" /> |
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==External links== |
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* {{JPL small body|id=7641}} |
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== Numbering and naming == |
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{{Minor planets navigator|7640 Marzari|(7642) 1988 TZ}} |
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This [[minor planet]] was numbered by the [[Minor Planet Center]] on 22 May 1997 ({{small|[[Minor Planet Circulars|M.P.C.]] 29897}}).<ref name="MPC-Circulars-Archive" /> On 14 May 2021, the object was named by the [[Working Group for Small Bodies Nomenclature]] (WGSBN), after [[Cteatus]] from Greek mythology, who had a conjoined twin. His son [[Amphimachus I of Elis|Amphimachus]] was one of the leaders of the Elean contingent in the [[Trojan War]].<ref name="WGSBN-Bulletin-Archive" /> |
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== Physical Characteristics == |
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In the [[Sloan Digital Sky Survey|SDSS]]-based taxonomy, ''Cteatus'' is a dark [[D-type asteroid]].<ref name="SDSS-Taxonomy" /> It has also been characterized as a D-type by [[Pan-STARRS]]{{'}} survey.<ref name="lcdb" /><ref name="Veres-2015" /> Its [[Asteroid color indices|V–I]] color index of 0.98 agrees with that of most Jovian D-type asteroids.<ref name="lcdb" /> |
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=== Rotation period === |
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In October 2009, a rotational [[lightcurve]] of ''Cteatus'' was obtained from [[Photometry (astronomy)|photometric]] observations by Italian astronomer [[Stefano Mottola]] at the [[Calar Alto Observatory]] in Spain. Lightcurve analysis gave a well-defined [[rotation period]] of 27.770 hours with a brightness amplitude of 0.40 [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=3]]}}).<ref name="lcdb" /><ref name="Mottola-2011" /> While not being a [[List of slow rotators (minor planets)|slow rotator]], its period is significantly longer than that of most larger Jupiter trojans, which have a spin rate of typically 10 hours. The body's relatively high brightness variation of 0.40 magnitude is also indicative of a non-spherical shape. |
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=== Diameter and albedo === |
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According to the surveys carried out by the Infrared Astronomical Satellite [[IRAS]], the Japanese [[Akari (satellite)|Akari satellite]] and the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], this asteroid measures between 68.97 and 75.28 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] between 0.062 and 0.071.<ref name="SIMPS" /><ref name="Grav-2012" /><ref name="AKARI" /> The ''Collaborative Asteroid Lightcurve Link'' derives an albedo of 0.0647 and a diameter of 68.89 kilometers based on an [[absolute magnitude]] of 9.4.<ref name="lcdb" /> |
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{{Largest Jupiter trojans}} |
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== References == |
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{{reflist|30em|refs= |
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<ref name="jpldata">{{cite web |
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|type = 2018-05-20 last obs. |
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|title = JPL Small-Body Database Browser: 7641 (1986 TT6) |
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|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007641 |
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|publisher = [[Jet Propulsion Laboratory]] |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="MPC-object">{{cite web |
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|title = 7641 (1986 TT6) |
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|work = Minor Planet Center |
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|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7641 |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="MPC-Jupiter-Trojans">{{cite web |
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|title = List of Jupiter Trojans |
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|work = Minor Planet Center |
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|date = 30 May 2018 |
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|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="MPC-Circulars-Archive">{{cite web |
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|title = MPC/MPO/MPS Archive |
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|work = Minor Planet Center |
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|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="WGSBN-Bulletin-Archive">{{cite web |
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|title = WGSBN Bulletin Archive |
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|work = Working Group for Small Bodies Nomenclature |
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|date = 14 May 2021 |
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|url = https://www.wgsbn-iau.org/files/Bulletins/index.html |
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|accessdate = 16 May 2021}} ([https://www.wgsbn-iau.org/files/Bulletins/V001/WGSBNBull_V001_001.pdf Bulletin #1])</ref> |
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<ref name="Grav-2012">{{cite journal |
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|first1 = T. |last1 = Grav |
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|first2 = A. K. |last2 = Mainzer |
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|first3 = J. M. |last3 = Bauer |
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|first4 = J. R. |last4 = Masiero |
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|first5 = C. R. |last5 = Nugent |
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|date = November 2012 |
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|title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |
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|journal = The Astrophysical Journal |
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|volume = 759 |
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|issue = 1 |
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|page = 10 |
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|bibcode = 2012ApJ...759...49G |
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|doi = 10.1088/0004-637X/759/1/49 |
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|arxiv = 1209.1549 |
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|s2cid = 119101711 |
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}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=07641 online catalog])</ref> |
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<ref name="AstDys-object">{{cite web |
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|title = Asteroid (7641) 1986 TT6 |
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|publisher = AstDyS-2, Asteroids – Dynamic Site |
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|url = https://newton.spacedys.com/astdys/index.php?n=7641&pc=1.1.6 |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="Ferret">{{cite web |
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|title = Asteroid (7641) 1986 TT6 |
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|work = Small Bodies Data Ferret |
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|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=7641 |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="SIMPS">{{cite journal |
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|first1 = E. F. |last1 = Tedesco |
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|first2 = P. V. |last2 = Noah |
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|first3 = M. |last3 = Noah |
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|first4 = S. D. |last4 = Price |
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|date = October 2004 |
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|title = IRAS Minor Planet Survey V6.0 |
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|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |
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|journal = NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 |
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|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |
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|bibcode = 2004PDSS...12.....T |
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|accessdate = 15 June 2018}}</ref> |
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<ref name="SDSS-Taxonomy">{{Cite journal |
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|first1 = J. M. |last1 = Carvano |
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|first2 = P. H. |last2 = Hasselmann |
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|first3 = D. |last3 = Lazzaro |
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|first4 = T. |last4 = Mothé-Diniz |
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|date = February 2010 |
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|title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids |
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|url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |
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|journal = Astronomy and Astrophysics |
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|volume = 510 |
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|page = 12 |
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|bibcode = 2010A&A...510A..43C |
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|doi = 10.1051/0004-6361/200913322 |
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|access-date= 30 October 2019|doi-access= free |
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}} [https://sbn.psi.edu/pds/resource/sdsstax.html (PDS data set)]</ref> |
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<ref name="lcdb">{{cite web |
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|title = LCDB Data for (7641) |
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|publisher = Asteroid Lightcurve Database (LCDB) |
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|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7641%7C |
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|accessdate = 10 June 2018}}</ref> |
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<ref name="AKARI">{{cite journal |
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|display-authors = 6 |
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|first1 = Fumihiko |last1 = Usui |
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|first2 = Daisuke |last2 = Kuroda |
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|first3 = Thomas G. |last3 = Müller |
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|first4 = Sunao |last4 = Hasegawa |
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|first5 = Masateru |last5 = Ishiguro |
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|first6 = Takafumi |last6 = Ootsubo |
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|first7 = Daisuke |last7 = Ishihara |
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|first8 = Hirokazu |last8 = Kataza |
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|first9 = Satoshi |last9 = Takita |
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|first10 = Shinki |last10 = Oyabu |
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|first11 = Munetaka |last11 = Ueno |
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|first12 = Hideo |last12 = Matsuhara |
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|first13 = Takashi |last13 = Onaka |
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|date = October 2011 |
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|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |
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|journal = Publications of the Astronomical Society of Japan |
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|volume = 63 |
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|issue = 5 |
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|pages = 1117–1138 |
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|bibcode = 2011PASJ...63.1117U |
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|doi = 10.1093/pasj/63.5.1117 |
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|doi-access= |
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}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=7641 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</ref> |
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<ref name="Mottola-2011">{{cite journal |
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|display-authors = 6 |
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|first1 = Stefano |last1 = Mottola |
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|first2 = Mario |last2 = Di Martino |
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|first3 = Anders |last3 = Erikson |
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|first4 = Maria |last4 = Gonano-Beurer |
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|first5 = Albino |last5 = Carbognani |
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|first6 = Uri |last6 = Carsenty |
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|first7 = Gerhard |last7 = Hahn |
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|first8 = Hans-Josef |last8 = Schober |
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|first9 = Felix |last9 = Lahulla |
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|first10 = Marco |last10 = Delbò |
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|first11 = Claes-Ingvar |last11 = Lagerkvist |
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|date = May 2011 |
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|title = Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects |
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|journal = The Astronomical Journal |
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|volume = 141 |
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|issue = 5 |
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|page = 32 |
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|bibcode = 2011AJ....141..170M |
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|doi = 10.1088/0004-6256/141/5/170 |
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|doi-access= free |
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|url= https://www.openaccessrepository.it/record/99323/files/fulltext.pdf |
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}}</ref> |
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<ref name="Veres-2015">{{cite journal |
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|display-authors = 6 |
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|first1 = Peter |last1 = Veres |
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|first2 = Robert |last2 = Jedicke |
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|first3 = Alan |last3 = Fitzsimmons |
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|first4 = Larry |last4 = Denneau |
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|first5 = Mikael |last5 = Granvik |
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|first6 = Bryce |last6 = Bolin |
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|first7 = Serge |last7 = Chastel |
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|first8 = Richard J. |last8 = Wainscoat |
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|first9 = William S. |last9 = Burgett |
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|first10 = Kenneth C. |last10 = Chambers |
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|first11 = Heather |last11 = Flewelling |
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|first12 = Nick |last12 = Kaiser |
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|first13 = Eugen A. |last13 = Magnier |
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|first14 = Jeff S. |last14 = Morgan |
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|first15 = Paul A. |last15 = Price |
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|first16 = John L. |last16 = Tonry |
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|first17 = Christopher |last17 = Waters |
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|date = November 2015 |
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|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |
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|journal = Icarus |
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|volume = 261 |
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|pages = 34–47 |
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|bibcode = 2015Icar..261...34V |
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|doi = 10.1016/j.icarus.2015.08.007 |
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|arxiv = 1506.00762 |
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|s2cid = 53493339 }}</ref> |
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}} <!-- end of reflist --> |
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== External links == |
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* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }}) |
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* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center |
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* {{AstDys|7641}} |
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* {{JPL small body}} |
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{{Minor planets navigator |7640 Marzari |number=7641 |(7642) 1988 TZ}} |
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{{Small Solar System bodies}} |
{{Small Solar System bodies}} |
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{{Authority control}} |
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{{DEFAULTSORT: |
{{DEFAULTSORT:Cteatus}} |
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[[Category:Articles created via the Article Wizard]] |
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[[Category:Jupiter trojans (Greek camp)|007641]] |
[[Category:Jupiter trojans (Greek camp)|007641]] |
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[[Category:Astronomical objects discovered in 1986|19861005]] |
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[[Category:Discoveries by Milan Antal]] |
[[Category:Discoveries by Milan Antal]] |
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[[Category: |
[[Category:Named minor planets]] |
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[[Category:Astronomical objects discovered in 1986|19861005]] |
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{{Jupiter-Trojan-stub}} |
Latest revision as of 13:07, 26 February 2024
Discovery [1] | |
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Discovered by | M. Antal |
Discovery site | Toruń–Piwnice |
Discovery date | 5 October 1986 |
Designations | |
(7641) Cteatus | |
Named after | Cteatus [2] (Greek mythology) |
1986 TT6 · 1975 VT5 1975 XS4 · 1986 VP5 1991 HY · 1996 RN26 | |
Jupiter trojan [1][3][4] Greek [5][6] · background [6] | |
Adjectives | Cteatian |
Orbital characteristics [3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 42.54 yr (15,539 d) |
Aphelion | 5.4898 AU |
Perihelion | 4.9398 AU |
5.2148 AU | |
Eccentricity | 0.0527 |
11.91 yr (4,350 d) | |
171.71° | |
0° 4m 58.08s / day | |
Inclination | 34.693° |
242.06° | |
228.81° | |
Jupiter MOID | 0.0165 AU |
TJupiter | 2.6420 |
Physical characteristics | |
Mean diameter | 68.89 km (derived)[4] 68.97±3.2 km[7] 71.84±1.64 km[8] 75.28±2.43 km[9] |
27.770±0.013 h[10] | |
0.062±0.005[9] 0.0647 (derived)[4] 0.065±0.011[8] 0.0708±0.007[7] | |
D (Pan-STARRS)[11] D (SDSS-MOC)[12] C (assumed)[4] V–I = 0.980±0.035[4] | |
9.09±0.41[11] 9.30[7][8][9] 9.4[1][3][4] | |
7641 Cteatus, provisional designation: 1986 TT6, is a large Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered on 5 October 1986, by Slovak astronomer Milan Antal at the Toruń Centre for Astronomy in Piwnice, Poland.[1] The dark D-type asteroid is notably inclined and has longer-than-average rotation period of 27.8 hours.[4] It belongs to the 50 largest Jupiter trojans. It was named from Greek mythology for Cteatus, the conjoined twin and father of Amphimachus.[2]
Orbit and classification[edit]
Cteatus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[6][13]
It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 11 months (4,350 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.05 and a notably high inclination of 35° with respect to the ecliptic.[3] The asteroid was first observed as 1975 VT5 at Crimea–Nauchnij in November 1975. The body's observation arc begins with its official discovery observation at the Toruń Centre.[1]
Numbering and naming[edit]
This minor planet was numbered by the Minor Planet Center on 22 May 1997 (M.P.C. 29897).[14] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Cteatus from Greek mythology, who had a conjoined twin. His son Amphimachus was one of the leaders of the Elean contingent in the Trojan War.[2]
Physical Characteristics[edit]
In the SDSS-based taxonomy, Cteatus is a dark D-type asteroid.[12] It has also been characterized as a D-type by Pan-STARRS' survey.[4][11] Its V–I color index of 0.98 agrees with that of most Jovian D-type asteroids.[4]
Rotation period[edit]
In October 2009, a rotational lightcurve of Cteatus was obtained from photometric observations by Italian astronomer Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a well-defined rotation period of 27.770 hours with a brightness amplitude of 0.40 magnitude (U=3).[4][10] While not being a slow rotator, its period is significantly longer than that of most larger Jupiter trojans, which have a spin rate of typically 10 hours. The body's relatively high brightness variation of 0.40 magnitude is also indicative of a non-spherical shape.
Diameter and albedo[edit]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures between 68.97 and 75.28 kilometers in diameter and its surface has an albedo between 0.062 and 0.071.[7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0647 and a diameter of 68.89 kilometers based on an absolute magnitude of 9.4.[4]
Largest Jupiter Trojans by survey(A) (mean-diameter in kilometers; YoD: Year of Discovery) | |||||||||
---|---|---|---|---|---|---|---|---|---|
Designation | H | WISE | IRAS | Akari | Ln | RP | V–I | YoD | Ref |
624 Hektor | 7.2 | 225 | 233 | 230.99 | L4 | 6.92 | 0.930 | 1907 | list |
617 Patroclus | 8.19 | 140.362 | 140.92 | 140.85 | L5 | 102.80 | 0.830 | 1906 | list |
911 Agamemnon | 7.89 | 131.038 | 166.66 | 185.30 | L4 | 6.59 | 0.980 | 1919 | list |
588 Achilles | 8.67 | 130.099 | 135.47 | 133.22 | L4 | 7.31 | 0.940 | 1906 | list |
3451 Mentor | 8.4 | 126.288 | 116.30 | 117.91 | L5 | 7.70 | 0.770 | 1984 | list |
3317 Paris | 8.3 | 118.790 | 116.26 | 120.45 | L5 | 7.09 | 0.950 | 1984 | list |
1867 Deiphobus | 8.3 | 118.220 | 122.67 | 131.31 | L5 | 58.66 | 0.930 | 1971 | list |
1172 Äneas | 8.33 | 118.020 | 142.82 | 148.66 | L5 | 8.71 | 0.950 | 1930 | list |
1437 Diomedes | 8.3 | 117.786 | 164.31 | 172.60 | L4 | 24.49 | 0.810 | 1937 | list |
1143 Odysseus | 7.93 | 114.624 | 125.64 | 130.81 | L4 | 10.11 | 0.860 | 1930 | list |
2241 Alcathous | 8.64 | 113.682 | 114.63 | 118.87 | L5 | 7.69 | 0.940 | 1979 | list |
659 Nestor | 8.99 | 112.320 | 108.87 | 107.06 | L4 | 15.98 | 0.790 | 1908 | list |
3793 Leonteus | 8.7 | 112.046 | 86.26 | 87.58 | L4 | 5.62 | 0.780 | 1985 | list |
3063 Makhaon | 8.4 | 111.655 | 116.14 | 114.34 | L4 | 8.64 | 0.830 | 1983 | list |
1583 Antilochus | 8.6 | 108.842 | 101.62 | 111.69 | L4 | 31.54 | 0.950 | 1950 | list |
884 Priamus | 8.81 | 101.093 | 96.29 | 119.99 | L5 | 6.86 | 0.900 | 1917 | list |
1208 Troilus | 8.99 | 100.477 | 103.34 | 111.36 | L5 | 56.17 | 0.740 | 1931 | list |
1173 Anchises | 8.89 | 99.549 | 126.27 | 120.49 | L5 | 11.60 | 0.780 | 1930 | list |
2207 Antenor | 8.89 | 97.658 | 85.11 | 91.32 | L5 | 7.97 | 0.950 | 1977 | list |
2363 Cebriones | 9.11 | 95.976 | 81.84 | 84.61 | L5 | 20.05 | 0.910 | 1977 | list |
4063 Euforbo | 8.7 | 95.619 | 102.46 | 106.38 | L4 | 8.85 | 0.950 | 1989 | list |
2357 Phereclos | 8.94 | 94.625 | 94.90 | 98.45 | L5 | 14.39 | 0.960 | 1981 | list |
4709 Ennomos | 8.5 | 91.433 | 80.85 | 80.03 | L5 | 12.28 | 0.690 | 1988 | list |
2797 Teucer | 8.7 | 89.430 | 111.14 | 113.99 | L4 | 10.15 | 0.920 | 1981 | list |
2920 Automedon | 8.8 | 88.574 | 111.01 | 113.11 | L4 | 10.21 | 0.950 | 1981 | list |
15436 Dexius | 9.1 | 87.646 | 85.71 | 78.63 | L4 | 8.97 | 0.870 | 1998 | list |
3596 Meriones | 9.2 | 87.380 | 75.09 | 73.28 | L4 | 12.96 | 0.830 | 1985 | list |
2893 Peiroos | 9.23 | 86.884 | 87.46 | 86.76 | L5 | 8.96 | 0.950 | 1975 | list |
4086 Podalirius | 9.1 | 85.495 | 86.89 | 85.98 | L4 | 10.43 | 0.870 | 1985 | list |
4060 Deipylos | 9.3 | 84.043 | 79.21 | 86.79 | L4 | 9.30 | 0.760 | 1987 | list |
1404 Ajax | 9.3 | 83.990 | 81.69 | 96.34 | L4 | 29.38 | 0.960 | 1936 | list |
4348 Poulydamas | 9.5 | 82.032 | 70.08 | 87.51 | L5 | 9.91 | 0.840 | 1988 | list |
5144 Achates | 9.0 | 80.958 | 91.91 | 89.85 | L5 | 5.96 | 0.920 | 1991 | list |
4833 Meges | 8.9 | 80.165 | 87.33 | 89.39 | L4 | 14.25 | 0.940 | 1989 | list |
2223 Sarpedon | 9.41 | 77.480 | 94.63 | 108.21 | L5 | 22.74 | 0.880 | 1977 | list |
4489 Dracius | 9.0 | 76.595 | 92.93 | 95.02 | L4 | 12.58 | 0.950 | 1988 | list |
2260 Neoptolemus | 9.31 | 76.435 | 71.65 | 81.28 | L4 | 8.18 | 0.950 | 1975 | list |
5254 Ulysses | 9.2 | 76.147 | 78.34 | 80.00 | L4 | 28.72 | 0.970 | 1986 | list |
3708 Socus | 9.3 | 75.661 | 79.59 | 76.75 | L5 | 6.55 | 0.980 | 1974 | list |
2674 Pandarus | 9.1 | 74.267 | 98.10 | 101.72 | L5 | 8.48 | 1.000 | 1982 | list |
3564 Talthybius | 9.4 | 73.730 | 68.92 | 74.11 | L4 | 40.59 | 0.900 | 1985 | list |
4834 Thoas | 9.1 | 72.331 | 86.82 | 96.21 | L4 | 18.19 | 0.950 | 1989 | list |
7641 Cteatus | 9.4 | 71.839 | 68.97 | 75.28 | L4 | 27.77 | 0.980 | 1986 | list |
3540 Protesilaos | 9.3 | 70.225 | 76.84 | 87.66 | L4 | 8.95 | 0.940 | 1973 | list |
11395 Iphinous | 9.8 | 68.977 | 64.71 | 67.78 | L4 | 17.38 | – | 1998 | list |
4035 Thestor | 9.6 | 68.733 | 68.23 | 66.99 | L4 | 13.47 | 0.970 | 1986 | list |
5264 Telephus | 9.4 | 68.472 | 73.26 | 81.38 | L4 | 9.53 | 0.970 | 1991 | list |
1868 Thersites | 9.5 | 68.163 | 70.08 | 78.89 | L4 | 10.48 | 0.960 | 1960 | list |
9799 Thronium | 9.6 | 68.033 | 64.87 | 72.42 | L4 | 21.52 | 0.910 | 1996 | list |
4068 Menestheus | 9.5 | 67.625 | 62.37 | 68.46 | L4 | 14.40 | 0.950 | 1973 | list |
23135 Pheidas | 9.9 | 66.230 | 58.29 | 68.50 | L4 | 8.69 | 0.860 | 2000 | list |
2456 Palamedes | 9.3 | 65.916 | 91.66 | 99.60 | L4 | 7.24 | 0.920 | 1966 | list |
3709 Polypoites | 9.1 | 65.297 | 99.09 | 85.23 | L4 | 10.04 | 1.000 | 1985 | list |
1749 Telamon | 9.5 | 64.898 | 81.06 | 69.14 | L4 | 16.98 | 0.970 | 1949 | list |
3548 Eurybates | 9.6 | 63.885 | 72.14 | 68.40 | L4 | 8.71 | 0.730 | 1973 | list |
4543 Phoinix | 9.7 | 63.836 | 62.79 | 69.54 | L4 | 38.87 | 1.200 | 1989 | list |
12444 Prothoon | 9.8 | 63.835 | 64.31 | 62.41 | L5 | 15.82 | – | 1996 | list |
4836 Medon | 9.5 | 63.277 | 67.73 | 78.70 | L4 | 9.82 | 0.920 | 1989 | list |
16070 Charops | 9.7 | 63.191 | 64.13 | 68.98 | L5 | 20.24 | 0.960 | 1999 | list |
15440 Eioneus | 9.6 | 62.519 | 66.48 | 71.88 | L4 | 21.43 | 0.970 | 1998 | list |
4715 Medesicaste | 9.7 | 62.097 | 63.91 | 65.93 | L5 | 8.81 | 0.850 | 1989 | list |
34746 Thoon | 9.8 | 61.684 | 60.51 | 63.63 | L5 | 19.63 | 0.950 | 2001 | list |
38050 Bias | 9.8 | 61.603 | 61.04 | 50.44 | L4 | 18.85 | 0.990 | 1998 | list |
5130 Ilioneus | 9.7 | 60.711 | 59.40 | 52.49 | L5 | 14.77 | 0.960 | 1989 | list |
5027 Androgeos | 9.6 | 59.786 | 57.86 | n.a. | L4 | 11.38 | 0.910 | 1988 | list |
6090 Aulis | 9.4 | 59.568 | 74.53 | 81.92 | L4 | 18.48 | 0.980 | 1989 | list |
5648 Axius | 9.7 | 59.295 | 63.91 | n.a. | L5 | 37.56 | 0.900 | 1990 | list |
7119 Hiera | 9.7 | 59.150 | 76.40 | 77.29 | L4 | 400 | 0.950 | 1989 | list |
4805 Asteropaios | 10.0 | 57.647 | 53.16 | 43.44 | L5 | 12.37 | – | 1990 | list |
16974 Iphthime | 9.8 | 57.341 | 55.43 | 57.15 | L4 | 78.9 | 0.960 | 1998 | list |
4867 Polites | 9.8 | 57.251 | 58.29 | 64.29 | L5 | 11.24 | 1.010 | 1989 | list |
2895 Memnon | 10.0 | 56.706 | 55.67 | n.a. | L5 | 7.50 | 0.710 | 1981 | list |
4708 Polydoros | 9.9 | 54.964 | 55.67 | n.a. | L5 | 7.52 | 0.960 | 1988 | list |
(21601) 1998 XO89 | 10.0 | 54.909 | 55.67 | 56.08 | L4 | 12.65 | 0.970 | 1998 | list |
12929 Periboea | 9.9 | 54.077 | 61.04 | 55.34 | L5 | 9.27 | 0.880 | 1999 | list |
17492 Hippasos | 10.0 | 53.975 | 55.67 | n.a. | L5 | 17.75 | – | 1991 | list |
5652 Amphimachus | 10.1 | 53.921 | 53.16 | 52.48 | L4 | 8.37 | 1.050 | 1992 | list |
2759 Idomeneus | 9.9 | 53.676 | 61.01 | 52.55 | L4 | 32.38 | 0.910 | 1980 | list |
5258 Rhoeo | 10.2 | 53.275 | 50.77 | n.a. | L4 | 19.85 | 1.010 | 1989 | list |
(12126) 1999 RM11 | 10.1 | 53.202 | n.a. | n.a. | L5 | n.a. | ? | 1999 | list |
(15502) 1999 NV27 | 10.0 | 53.100 | 55.67 | 50.86 | L5 | 15.13 | 0.875 | 1999 | list |
4754 Panthoos | 10.0 | 53.025 | 53.15 | 56.96 | L5 | 27.68 | – | 1977 | list |
4832 Palinurus | 10.0 | 52.058 | 53.16 | n.a. | L5 | 5.32 | 1.000 | 1988 | list |
5126 Achaemenides | 10.5 | 51.922 | 44.22 | 48.57 | L4 | 53.02 | – | 1989 | list |
3240 Laocoon | 10.2 | 51.695 | 50.77 | n.a. | L5 | 11.31 | 0.880 | 1978 | list |
4902 Thessandrus | 9.8 | 51.263 | 61.04 | 71.79 | L4 | 738 | 0.960 | 1989 | list |
11552 Boucolion | 10.1 | 51.136 | 53.16 | 53.91 | L5 | 32.44 | – | 1993 | list |
(20729) 1999 XS143 | 10.4 | 50.961 | 46.30 | n.a. | L4 | 5.72 | 1.000 | 1999 | list |
6545 Leitus | 10.1 | 50.951 | 53.16 | n.a. | L4 | 16.26 | 0.910 | 1986 | list |
4792 Lykaon | 10.1 | 50.870 | 53.16 | n.a. | L5 | 40.09 | 0.960 | 1988 | list |
21900 Orus | 10.0 | 50.810 | 55.67 | 53.87 | L4 | 13.45 | 0.950 | 1999 | list |
1873 Agenor | 10.1 | 50.799 | 53.76 | 54.38 | L5 | 20.60 | – | 1971 | list |
5028 Halaesus | 10.2 | 50.770 | 50.77 | n.a. | L4 | 24.94 | 0.900 | 1988 | list |
2146 Stentor | 9.9 | 50.755 | 58.29 | n.a. | L4 | 16.40 | – | 1976 | list |
4722 Agelaos | 10.0 | 50.378 | 53.16 | 59.47 | L5 | 18.44 | 0.910 | 1977 | list |
5284 Orsilocus | 10.1 | 50.159 | 53.16 | n.a. | L4 | 10.31 | 0.970 | 1989 | list |
11509 Thersilochos | 10.1 | 49.960 | 53.16 | 56.23 | L5 | 17.37 | – | 1990 | list |
5285 Krethon | 10.1 | 49.606 | 58.53 | 52.61 | L4 | 12.04 | 1.090 | 1989 | list |
4791 Iphidamas | 10.1 | 49.528 | 57.85 | 59.96 | L5 | 9.70 | 1.030 | 1988 | list |
9023 Mnesthus | 10.1 | 49.151 | 50.77 | 60.80 | L5 | 30.66 | – | 1988 | list |
5283 Pyrrhus | 9.7 | 48.356 | 64.58 | 69.93 | L4 | 7.32 | 0.950 | 1989 | list |
4946 Askalaphus | 10.2 | 48.209 | 52.71 | 66.10 | L4 | 22.73 | 0.940 | 1988 | list |
(22149) 2000 WD49 | 10.2 | 48.190 | 50.77 | 50.37 | L4 | 7.84 | 1.090 | 2000 | list |
(32496) 2000 WX182 | 10.2 | 48.017 | 50.77 | 51.63 | L5 | 23.34 | 0.950 | 2000 | list |
5120 Bitias | 10.2 | 47.987 | 50.77 | n.a. | L5 | 15.21 | 0.780 | 1988 | list |
12714 Alkimos | 10.1 | 47.819 | 61.04 | 54.62 | L4 | 28.48 | – | 1991 | list |
7352 Hypsenor | 9.9 | 47.731 | 55.67 | 47.07 | L5 | 648 | 0.850 | 1994 | list |
1870 Glaukos | 10.6 | 47.649 | 42.23 | n.a. | L5 | 5.99 | — | 1971 | list |
4138 Kalchas | 10.1 | 46.462 | 53.16 | 61.04 | L4 | 29.2 | 0.810 | 1973 | list |
(23958) 1998 VD30 | 10.2 | 46.001 | 50.77 | 47.91 | L4 | 562 | 0.990 | 1998 | list |
4828 Misenus | 10.4 | 45.954 | 46.30 | 43.22 | L5 | 12.87 | 0.920 | 1988 | list |
4057 Demophon | 10.1 | 45.683 | 53.16 | n.a. | L4 | 29.82 | 1.060 | 1985 | list |
4501 Eurypylos | 10.4 | 45.524 | 46.30 | n.a. | L4 | 6.05 | – | 1989 | list |
4007 Euryalos | 10.3 | 45.515 | 48.48 | 53.89 | L4 | 6.39 | – | 1973 | list |
5259 Epeigeus | 10.3 | 44.741 | 42.59 | 44.42 | L4 | 18.42 | – | 1989 | list |
30705 Idaios | 10.4 | 44.546 | 46.30 | n.a. | L5 | 15.74 | – | 1977 | list |
16560 Daitor | 10.7 | 43.861 | 51.42 | 43.38 | L5 | – | – | 1991 | list |
(15977) 1998 MA11 | 10.4 | 43.530 | 46.30 | 51.53 | L5 | 250 | 0.906 | 1998 | list |
7543 Prylis | 10.6 | 42.893 | 42.23 | n.a. | L4 | 17.80 | – | 1973 | list |
4827 Dares | 10.5 | 42.770 | 44.22 | n.a. | L5 | 19.00 | – | 1988 | list |
1647 Menelaus | 10.5 | 42.716 | 44.22 | n.a. | L4 | 17.74 | 0.866 | 1957 | list |
(A) Used sources: WISE/NEOWISE catalog (NEOWISE_DIAM_V1 PDS, Grav, 2012); IRAS data (SIMPS v.6 catalog); and Akari catalog (Usui, 2011); RP: rotation period and V–I (color index) taken from the LCDB
Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100. |
References[edit]
- ^ a b c d e "7641 (1986 TT6)". Minor Planet Center. Retrieved 10 June 2018.
- ^ a b c "WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 14 May 2021. Retrieved 16 May 2021. (Bulletin #1)
- ^ a b c d "JPL Small-Body Database Browser: 7641 (1986 TT6)" (2018-05-20 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2018.
- ^ a b c d e f g h i j k "LCDB Data for (7641)". Asteroid Lightcurve Database (LCDB). Retrieved 10 June 2018.
- ^ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 10 June 2018.
- ^ a b c "Asteroid (7641) 1986 TT6". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 June 2018.
- ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
- ^ a b c d Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
- ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
- ^ a b Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects" (PDF). The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
- ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.
- ^ a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
- ^ "Asteroid (7641) 1986 TT6". Small Bodies Data Ferret. Retrieved 10 June 2018.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 June 2018.
External links[edit]
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 7641 Cteatus at AstDyS-2, Asteroids—Dynamic Site
- 7641 Cteatus at the JPL Small-Body Database