(48639) 1995 TL8: Difference between revisions

(48639) 1995 TL₈
	1995 TL8 and its satellite (unresolved) imaged by the Hubble Space Telescope
Discovery
Discovered by	A. Gleason (Spacewatch)
Discovery site	Kitt Peak National Obs.
Discovery date	15 October 1995
Designations
MPC designation	(48639) 1995 TL8
Alternative designations	1995 TL8
Minor planet category	TNO · Other TNO; detached · distant
Orbital characteristics
	Epoch 17 December 2020 (JD 2459200.5)
	Uncertainty parameter 2
Observation arc	25.26 yr (9,225 days)
Aphelion	65.218 AU
Perihelion	39.937 AU
Semi-major axis	52.578 AU
Eccentricity	0.2404
Orbital period (sidereal)	381.25 yr (139,251 days)
Mean anomaly	46.972°
Mean motion	0° 0m 9.36s / day
Inclination	0.2499°
Longitude of ascending node	260.007°
Argument of perihelion	84.397°
Known satellites	1 (D: 80 km)
Physical characteristics
Dimensions	176 km; 420.27 km (calculated); 495 km (estimated)
Geometric albedo	0.07 (estimated); 0.10 (assumed); 0.369
Spectral type	RR · C (assumed)
Absolute magnitude (H)	4.667±0.091 (R) · 4.8 · 5.1 · 5.290±0.060

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(48639) 1995 TL₈ is a binary trans-Neptunian object from the scattered disc in the outermost regions of the Solar System. It was discovered by Arianna Gleason in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer minor-planet moon, provisionally designated S/2002 (48639) 1, was discovered on 9 November 2002.^[5]

Discovery[edit]

1995 TL₈ was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of UA's Spacewatch survey at Kitt Peak National Observatory, near Tucson, Arizona.^[2]

It was the first of the bodies presently classified as a scattered-disc object (SDO)^[3]^{[failed verification]} to be discovered, preceding the SDO prototype (15874) 1996 TL66 by almost a year.^{[citation needed]}

Satellite[edit]

Animation of two Hubble images of 1995 TL₈'s satellite in August 2001

A companion was discovered by Denise C. Stephens and Keith S. Noll, from observations with the Hubble Space Telescope taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated S/2002 (48639) 1, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about 420 kilometres (260 mi) to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of 161 kilometres (100 mi).^[5]

Scattered–extended object[edit]

1995 TL₈ is classified as detached object (scattered–extended) by the Deep Ecliptic Survey, since its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.^[4] However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.

Simulations made in 2007 show that 1995 TL₈ appears to have less than a 1% chance of being in a 3:7 resonance with Neptune, but it does execute circulations near this resonance.^[10]

Left: The near 3:7 resonance pattern of 1995 TL₈ with Neptune only moves clockwise. It never halts and reverses course (i.e. librates).
Right: The orbital period of 1995 TL₈ missing the 7:3 (2.333) resonance of Neptune

Numbering and naming[edit]

This minor planet was numbered by the Minor Planet Center on 20 November 2002.^[11] As of 2018, it has not been named.^[2]

Notes[edit]

^ Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of 5.290±0.060. Summary figures for (48639) at LCDB not found at ADS (2013A&A...557...60L)

References[edit]

^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 48639 (1995 TL8)" (2021-01-16 last obs.). Jet Propulsion Laboratory. Retrieved 14 March 2021.
^ ^a ^b ^c ^d "48639 (1995 TL8)". Minor Planet Center. Retrieved 16 November 2017.
^ ^a ^b Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 16 November 2017.
^ ^a ^b Marc W. Buie (22 October 2003). "Orbit Fit and Astrometric record for 48639". SwRI (Space Science Department). Retrieved 26 January 2009.
^ ^a ^b ^c ^d ^e Johnston, Wm. Robert (21 September 2014). "Asteroids with Satellites Database – (48639) 1995 TL8". Johnston's Archive. Retrieved 16 November 2017.
^ ^a ^b ^c ^d "LCDB Data for (48639)". Asteroid Lightcurve Database (LCDB). Retrieved 16 November 2017.
^ ^a ^b ^c Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 16 November 2017.
^ Belskaya, Irina N.; Barucci, Maria A.; Fulchignoni, Marcello; Dovgopol, Anatolij N. (April 2015). "Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo". Icarus. 250: 482–491. Bibcode:2015Icar..250..482B. doi:10.1016/j.icarus.2014.12.004. Retrieved 16 November 2016.
^ Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects". Astronomy and Astrophysics. 546: 12. arXiv:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. S2CID 55876118. Retrieved 16 November 2017.
^ Emel'Yanenko, V. V.; Kiseleva, E. L. (April 2008). "Resonant motion of trans-Neptunian objects in high-eccentricity orbits". Astronomy Letters. 34 (4): 271–279. Bibcode:2008AstL...34..271E. doi:10.1134/S1063773708040075. S2CID 122634598. Retrieved 16 November 2017.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

External links[edit]

1999 MPEC listing
2000 MPEC listing
Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Discovery Circumstances: Numbered Minor Planets (45001)-(50000) – Minor Planet Center
(48639) 1995 TL8 at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
(48639) 1995 TL8 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

[lcdb-Lellouch-2013-10] Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of 5.290±0.060. Summary figures for (48639) at LCDB not found at ADS (2013A&A...557...60L)

[jpldata-1] "JPL Small-Body Database Browser: 48639 (1995 TL8)" (2021-01-16 last obs.). Jet Propulsion Laboratory. Retrieved 14 March 2021.

[MPC-object-2] "48639 (1995 TL8)". Minor Planet Center. Retrieved 16 November 2017.

[johnstonsarchive-TNO-list-3] Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 16 November 2017.

[Buie-4] Marc W. Buie (22 October 2003). "Orbit Fit and Astrometric record for 48639". SwRI (Space Science Department). Retrieved 26 January 2009.

[johnstonsarchive-5] Johnston, Wm. Robert (21 September 2014). "Asteroids with Satellites Database – (48639) 1995 TL8". Johnston's Archive. Retrieved 16 November 2017.

[lcdb-6] "LCDB Data for (48639)". Asteroid Lightcurve Database (LCDB). Retrieved 16 November 2017.

[Brown-dplist-7] Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 16 November 2017.

[Belskaya-2015-8] Belskaya, Irina N.; Barucci, Maria A.; Fulchignoni, Marcello; Dovgopol, Anatolij N. (April 2015). "Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo". Icarus. 250: 482–491. Bibcode:2015Icar..250..482B. doi:10.1016/j.icarus.2014.12.004. Retrieved 16 November 2016.

[Peixinho-2012-9] Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects". Astronomy and Astrophysics. 546: 12. arXiv:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. S2CID 55876118. Retrieved 16 November 2017.

[Emel'Yanenko-2008-11] Emel'Yanenko, V. V.; Kiseleva, E. L. (April 2008). "Resonant motion of trans-Neptunian objects in high-eccentricity orbits". Astronomy Letters. 34 (4): 271–279. Bibcode:2008AstL...34..271E. doi:10.1134/S1063773708040075. S2CID 122634598. Retrieved 16 November 2017.

[MPC-Circulars-Archive-12] "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

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@@ Line 1: / Line 1: @@
+{{Use dmy dates|date=October 2019}}
 {{DISPLAYTITLE:{{mp|(48639) 1995 TL|8}}}}
 {{Infobox planet
@@ Line 4: / Line 5: @@
  | name            = {{mp|(48639) 1995 TL|8}}
  | background      = #C2E0FF
- | image           =
+ | image           = 1995TL8-satellite-discovery.jpg
- | image_size      =
+ | image_scale      =
+ | caption         = {{mp|1995 TL|8}} and its satellite (unresolved) imaged by the [[Hubble Space Telescope]]
- | caption         =
- | discovery_ref   = &thinsp;<ref name="jpldata" /><ref name="MPC-object" />
+ | discovery_ref   = <ref name="jpldata" /><ref name="MPC-object" />
- | discoverer      = [[Arianna E. Gleason|A. Gleason]] {{small|([[Spacewatch]])}}
+ | discoverer      = A. Gleason {{small|([[Spacewatch]])}}
  | discovery_site  = {{nowrap|[[Kitt Peak National Observatory|Kitt Peak National Obs.]]}}
  | discovered      = 15 October 1995
@@ Line 15: / Line 16: @@
  | pronounced      =
  | named_after     = <!-- [[xafter]]<br />{{small|(descr.)}} -->
- | mp_category     = [[Trans-Neptunian object|TNO]]&thinsp;<ref name="jpldata" />{{·}}[[Scattered-disc object|SDO]]&thinsp;<ref name="johnstonsarchive-TNO-list" /><br />[[Detached objects|detached]]&thinsp;<ref name="Buie" />{{·}}[[Distant minor planet|distant]]&thinsp;<ref name="MPC-object" />
+ | mp_category     = [[Trans-Neptunian object|TNO]]<ref name="jpldata" />{{·}}Other TNO<ref name="johnstonsarchive-TNO-list" /><br />[[Detached objects|detached]]<ref name="Buie" />{{·}}[[Distant minor planet|distant]]<ref name="MPC-object" />
- | orbit_ref       = &thinsp;<ref name="jpldata" />
+ | orbit_ref       = <ref name="jpldata" />
- | epoch           = 4 September 2017 ([[Julian day|JD]] 2458000.5)
+ | epoch           = 17 December 2020 ([[Julian day|JD]] 2459200.5)
  | uncertainty     = 2
- | observation_arc = 19.30 yr (7,049 days)
+ | observation_arc = 25.26 yr (9,225 days)
- | aphelion        = 64.486 [[Astronomical unit|AU]]
+ | aphelion        = 65.218 [[Astronomical unit|AU]]
- | perihelion      = 39.969 AU
+ | perihelion      = 39.937 AU
- | semimajor       = 52.227 AU
+ | semimajor       = 52.578 AU
- | eccentricity    = 0.2347
+ | eccentricity    = 0.2404
- | period          = 377.45 [[Julian year (astronomy)|yr]] (137,863 days)
+ | period          = 381.25 [[Julian year (astronomy)|yr]] (139,251 days)
- | mean_anomaly    = 44.811[[Degree (angle)|°]]
+ | mean_anomaly    = 46.972[[Degree (angle)|°]]
  | mean_motion     = {{Deg2DMS|0.0026|sup=ms}} / day
- | inclination     = 0.2478°
+ | inclination     = 0.2499°
- | asc_node        = 260.27°
+ | asc_node        = 260.007°
- | arg_peri        = 83.589°
+ | arg_peri        = 84.397°
  | satellites      = 1 (D: 80 km)<ref name="johnstonsarchive" />
  | dimensions      = 176 km<ref name="johnstonsarchive" /><br />420.27 km {{small|(calculated)}}<ref name="lcdb" /><br />495 km {{small|(estimated)}}<ref name="Brown-dplist" />
  | rotation        =
  | albedo          = 0.07 {{small|(estimated)}}<ref name="Brown-dplist" /><br />0.10 {{small|(assumed)}}<ref name="lcdb" /><br />0.369<ref name="johnstonsarchive" />
- | spectral_type   = [[Trans-Neptunian object#Colours|RR]]&thinsp;<ref name="Belskaya-2015" />{{·}}[[C-type asteroid|C]] {{small|(assumed)}}<ref name="lcdb" />
+ | spectral_type   = [[Trans-Neptunian object#Colours|RR]]<ref name="Belskaya-2015" />{{·}}[[C-type asteroid|C]] {{small|(assumed)}}<ref name="lcdb" />
- | abs_magnitude   = {{val|4.667|0.091}} {{small|(R)}}<ref name="Peixinho-2012" />{{·}}5.0<ref name="jpldata" /><ref name="lcdb" />{{·}}5.1<ref name="Brown-dplist" />{{·}}{{val|5.290|0.060}}{{efn|name=lcdb-Lellouch-2013}}
+ | abs_magnitude   = {{val|4.667|0.091}} {{small|(R)}}<ref name="Peixinho-2012" />{{·}}4.8<ref name="jpldata" /><ref name="lcdb" />{{·}}5.1<ref name="Brown-dplist" />{{·}}{{val|5.290|0.060}}{{efn|name=lcdb-Lellouch-2013}}
 }}
-'''{{mp|(48639) 1995 TL|8}}''' is a binary [[trans-Neptunian object]] from the [[scattered disc]] in the outermost regions of the [[Solar System]]. It was discovered by [[Arianna E. Gleason|Arianna Gleason]] in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer [[minor-planet moon]], provisionally designated {{mp|S/2002 (48639) 1}}, was discovered on 9 November 2002.<ref name="johnstonsarchive" />
+'''{{mp|(48639) 1995 TL|8}}''' is a binary [[trans-Neptunian object]] from the [[scattered disc]] in the outermost regions of the [[Solar System]]. It was discovered by Arianna Gleason in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer [[minor-planet moon]], provisionally designated {{mp|S/2002 (48639) 1}}, was discovered on 9 November 2002.<ref name="johnstonsarchive" />
 == Discovery ==
-{{mp|1995 TL|8}} was discovered on 15 October 1995, by American astronomer [[Arianna E. Gleason|Arianna Gleason]] as part of [[University of Arizona|UA]]'s [[Spacewatch]] survey at [[Kitt Peak National Observatory]], near Tucson, Arizona.<ref name="MPC-object" />
+{{mp|1995 TL|8}} was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of [[University of Arizona|UA]]'s [[Spacewatch]] survey at [[Kitt Peak National Observatory]], near Tucson, Arizona.<ref name="MPC-object" />
-It was the first of the bodies presently classified as a [[scattered-disc object]] (SDO)<ref name="johnstonsarchive-TNO-list" /> to be discovered, preceding the SDO prototype {{mpl|(15874) 1996 TL|66}} by almost a year.{{citation needed|date=November 2017}}
+It was the first of the bodies presently classified as a [[scattered-disc object]] (SDO)<ref name="johnstonsarchive-TNO-list"/>{{failed verification|date=March 2021}} to be discovered, preceding the SDO prototype {{mpl|(15874) 1996 TL|66}} by almost a year.{{citation needed|date=November 2017}}
 == Satellite ==
+[[File:1995TL8.gif|thumb|left|Animation of two Hubble images of {{mp|1995 TL|8}}'s satellite in August 2001]]
+A companion was discovered by [[Denise Stephens|Denise C. Stephens]] and Keith S. Noll, from observations with the [[Hubble Space Telescope]] taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated {{mp|S/2002 (48639) 1}}, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about {{convert|420|km|mi}} to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of {{convert|161|km|mi}}.<ref name="johnstonsarchive" />
+{{clear|left}}
-A companion was discovered by Denise C. Stephens and Keith S. Noll, from observations with the [[Hubble Space Telescope]] taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated {{mp|S/2002 (48639) 1}}, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about {{convert|420|km|mi}} to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of {{convert|161|km|mi}}.<ref name="johnstonsarchive" />
+[[File:1995 TL8 binary-earth comparison.jpg|thumb|900px|none|A relative size and distance comparison of the {{mp|1995 TL|8}} system with the [[Earth]]–[[Moon]] system. The scale of the Earth–Moon system has been reduced so Earth appears the same size as the {{mp|1995 TL|8}} primary.]]
+{{clear|left}}
-[[File:1995 TL8 binary-earth comparison.jpg|thumb|600px|none|A relative size and distance comparison of the {{mp|1995 TL|8}} system with the [[Earth]]–[[Moon]] system. The scale of the Earth–Moon system has been reduced so Earth appears the same size as the {{mp|1995 TL|8}} primary.]]
 == Scattered–extended object ==
@@ Line 80: / Line 83: @@
 {{notelist|refs=
-{{efn|name=lcdb-Lellouch-2013|1=Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of {{val|5.290|0.060}}. Summary figures for (48639)  at [http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=48639%7C LCDB] not found at ADS ([http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...557...60L 2013A&A...557...60L])}}
+{{efn|name=lcdb-Lellouch-2013|1=Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of {{val|5.290|0.060}}. Summary figures for (48639)  at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=48639%7C LCDB] not found at ADS ([http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...557...60L 2013A&A...557...60L])}}
 }} <!-- end of notelist -->
@@ Line 88: / Line 91: @@
 <ref name="jpldata">{{cite web
-  |type       = 2015-02-01 last obs.
+  |type       = 2021-01-16 last obs.
   |title      = JPL Small-Body Database Browser: 48639 (1995 TL8)
   |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2048639
   |publisher  = [[Jet Propulsion Laboratory]]
-  |accessdate = 16 November 2017}}</ref>
+  |accessdate = 14 March 2021}}</ref>
 <ref name="MPC-object">{{cite web
@@ Line 150: / Line 153: @@
   |bibcode    = 2008AstL...34..271E
   |doi        = 10.1134/S1063773708040075
-  |access-date= 16 November 2017}}</ref>
+  |s2cid = 122634598
+ |access-date= 16 November 2017}}</ref>
 <ref name="lcdb">{{cite web
   |title      = LCDB Data for (48639)
   |publisher  = Asteroid Lightcurve Database (LCDB)
-  |url        = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=48639%7C
+  |url        = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=48639%7C
   |accessdate = 16 November 2017}}</ref>
@@ Line 173: / Line 177: @@
   |doi        = 10.1051/0004-6361/201219057
   |arxiv = 1206.3153
-  |access-date= 16 November 2017}}</ref>
+  |s2cid = 55876118
+ |access-date= 16 November 2017}}</ref>
 <ref name="Belskaya-2015">{{Cite journal
@@ Line 195: / Line 200: @@
 * [http://www.cfa.harvard.edu/iau/mpec/J99/J99L24.html 1999 MPEC listing]
 * [http://www.cfa.harvard.edu/iau/mpec/K00/K00Q15.html 2000 MPEC listing]
-* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
+* [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 }})
-* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs045001.html Discovery Circumstances: Numbered Minor Planets (45001)-(50000)] – Minor Planet Center
+* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs045001.html Discovery Circumstances: Numbered Minor Planets (45001)-(50000)] – Minor Planet Center
+* {{AstDys|48639}}
 * {{JPL small body}}
 {{Trans-Neptunian objects}}
+{{Minor planets navigator | |number=48639 |PageName={{mp|(48639) 1995 TL|8}} | }}
-{{Dwarf planets}}
-{{Minor planets navigator| |number=48639 |PageName={{mp|(48639) 1995 TL|8}} | }}
 {{Small Solar System bodies}}
+{{Authority control}}
 {{DEFAULTSORT:1995 TL8}}
@@ Line 208: / Line 214: @@
 [[Category:Discoveries by Arianna E. Gleason]]
 [[Category:Binary trans-Neptunian objects|048639]]
-[[Category:Possible dwarf planets|048639]]
 [[Category:Astronomical objects discovered in 1995|19951015]]
 [[Category:Astronomical objects discovered in 2002|20021109]]

v t e Trans-Neptunian objects
TNO classes	Cubewanos Scattered-disc objects Detached objects Resonant objects Neptune trojans Plutinos Twotinos TNO moons
Dwarf planets (moons)	Orcus Vanth Pluto Charon Styx Nix Kerberos Hydra Haumea Namaka Hiʻiaka Ring Quaoar Weywot Rings Makemake MK2 Gonggong Xiangliu Eris Dysnomia Sedna
Sednoids	90377 Sedna 2012 VP113 541132 Leleākūhonua 2021 RR205