(48639) 1995 TL8
Discovery | |
---|---|
Discovered by | A. Gleason (Spacewatch) |
Discovery date | 15 October 1995 and 9 November 2002 (moon) |
Designations | |
MPC designation | (48639) 1995 TL8 |
none | |
Classical (DES)[1] | |
Orbital characteristics [2] | |
Epoch 30 November 2008 (JD 2454800.5) | |
Aphelion | 65.086 AU 9,736 Gm (Q) |
Perihelion | 39.980 AU 5,980 Gm (q) |
52.533 AU 7,858 Gm (a) |
|
Eccentricity | 0.23894 |
380.77 a (139077 d) | |
Average orbital speed
|
4.06 km/s |
35.705° | |
Inclination | 0.24686° |
260.30° | |
84.104° | |
Known satellites | 1 |
Physical characteristics | |
Dimensions | ≈ 350 (primary) and ≈160 km (secondary) |
Albedo | 0.09 (assumed) |
Temperature | ≈ 38 K |
5.28 and 6.98 | |
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(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]
Contents
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
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External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 1999 MPEC listing
- 2000 MPEC listing
- IAU minor planet lists
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