(48639) 1995 TL8: Difference between revisions
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{{DISPLAYTITLE:{{mp|(48639) 1995 TL|8}}}} |
{{DISPLAYTITLE:{{mp|(48639) 1995 TL|8}}}} |
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{{Infobox planet |
{{Infobox planet |
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| |
| minorplanet = yes |
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| physical_characteristics = yes |
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| background = #FFFFC0 |
| background = #FFFFC0 |
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| name = {{mp|(48639) 1995 TL|8}} |
| name = {{mp|(48639) 1995 TL|8}} |
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| alt_names = ''none'' |
| alt_names = ''none'' |
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| mp_category = [[Classical Kuiper belt object|Classical]] ([[Deep Ecliptic Survey|DES]])<ref name="Buie" /> |
| mp_category = [[Classical Kuiper belt object|Classical]] ([[Deep Ecliptic Survey|DES]])<ref name="Buie" /> |
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| orbit_ref = |
| orbit_ref = <ref name="jpldata" /> |
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| epoch = |
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5) |
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| semimajor = 52. |
| semimajor = {{Convert|52.358|AU|Tm|abbr=on}} |
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| perihelion = |
| perihelion = {{Convert|40.085|AU|Tm|abbr=on}} |
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| aphelion = |
| aphelion = {{Convert|64.631|AU|Tm|abbr=on|lk=on}} |
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| eccentricity = 0. |
| eccentricity = 0.23441 |
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| period = |
| period = 378.86 [[Julian year (astronomy)|yr]] (138378 [[Julian year (astronomy)|d]]) |
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| inclination = 0. |
| inclination = 0.24457° |
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| asc_node = 260. |
| asc_node = 260.76° |
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| arg_peri = |
| arg_peri = 83.906° |
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| mean_anomaly = |
| mean_anomaly = 42.652[[Degree (angle)|°]] |
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| avg_speed = 4.06 km/s |
| avg_speed = 4.06 km/s |
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| satellites = 1 |
| satellites = 1 |
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| dimensions = |
| dimensions = ≈ 350 (primary)<br>and ≈160 km (secondary) |
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| mass = |
| mass = |
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| density = |
| density = |
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| surface_grav = |
| surface_grav = |
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| escape_velocity = |
| escape_velocity = |
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| sidereal_day = |
| sidereal_day = |
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| spectral_type = |
| spectral_type = |
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| abs_magnitude = 5. |
| abs_magnitude = 5.4 |
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| albedo = 0.09 (assumed) |
| albedo = 0.09 (assumed) |
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| single_temperature= |
| single_temperature= ≈ 38 [[kelvin|K]] |
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| mean_motion = {{Deg2DMS|0.0026016|sup=ms}} / day |
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| observation_arc = 4702 days (12.87 yr) |
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| uncertainty = 4 |
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| moid = {{Convert|39.0755|AU|Tm|abbr=on}} |
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| jupiter_moid = {{Convert|35.0968|AU|Tm|abbr=on}} |
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}} |
}} |
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|title=JPL Small-Body Database Browser: 48639 (1995 TL8) |
|title=JPL Small-Body Database Browser: 48639 (1995 TL8) |
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|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48639 |
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=48639 |
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|accessdate= |
|accessdate=6 April 2016}}</ref> |
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<ref name="johnston">{{cite web |
<ref name="johnston">{{cite web |
Revision as of 13:53, 6 April 2016
Discovery | |
---|---|
Discovered by | A. Gleason (Spacewatch) |
Discovery date | 15 October 1995 and 9 November 2002 (moon) |
Designations | |
(48639) 1995 TL8 | |
none | |
Classical (DES)[1] | |
Orbital characteristics [2] | |
Epoch 13 January 2016 (JD 2457400.5) | |
Uncertainty parameter 4 | |
Observation arc | 4702 days (12.87 yr) |
Aphelion | 64.631 AU (9.6687 Tm) |
Perihelion | 40.085 AU (5.9966 Tm) |
52.358 AU (7.8326 Tm) | |
Eccentricity | 0.23441 |
378.86 yr (138378 d) | |
Average orbital speed | 4.06 km/s |
42.652° | |
0° 0m 9.366s / day | |
Inclination | 0.24457° |
260.76° | |
83.906° | |
Known satellites | 1 |
Earth MOID | 39.0755 AU (5.84561 Tm) |
Jupiter MOID | 35.0968 AU (5.25041 Tm) |
Physical characteristics | |
Dimensions | ≈ 350 (primary) and ≈160 km (secondary) |
0.09 (assumed) | |
Temperature | ≈ 38 K |
5.4 | |
(48639) 1995 TL8 (also written (48639) 1995 TL8) is a classical Kuiper belt object possessing a relatively large satellite.
The assumed diameter of 352 kilometres (219 mi) is derived from an albedo guess of 0.09, being typical for trans-Neptunian objects.[3]
Discovery
Discovered in 1995 by Arianna Gleason as part of the Spacewatch project, it was the first of the bodies presently classified as a scattered-disc object (SDO) to be discovered, preceding the SDO prototype (15874) 1996 TL66 by almost a year.
Satellite
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).[4]
Scattered–extended object
(48639) 1995 TL8 is classified as scattered–extended by the Deep Ecliptic Survey (DES), since its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.[1] However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.
Simulations by Emel’yanenko and Kiseleva in 2007 show that (48639) 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.[5]
It has been observed 48 times and has an orbit quality code of 4 (0 being best; 9 being worst).[2]
See also
- 3753 Cruithne (orbital circulations due to near resonant perturbations with Earth)
- (131696) 2001 XT254 - to see a proper 3:7 resonance with Neptune
References
- ^ a b Marc W. Buie (2003-10-22). "Orbit Fit and Astrometric record for 48639". SwRI (Space Science Department). Retrieved 2009-01-26.
- ^ a b "JPL Small-Body Database Browser: 48639 (1995 TL8)" (last obs). 2008-08-29. Retrieved 6 April 2016.
- ^ Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 13 February 2009. Retrieved 2009-01-26.
- ^ Wm. Robert Johnston (2005-10-09). "(48639) 1995 TL8". Johnston's Archive. Archived from the original on 10 December 2005. Retrieved 2006-02-07.
- ^ Emel’yanenko, V. V; Kiseleva, E. L. (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.