(48639) 1995 TL8
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- The correct title of this article is (48639) 1995 TL8. It features superscript or subscript characters that are substituted or omitted because of technical limitations.
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Discovery
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| Discovered by | A. Gleason (Spacewatch) |
| Discovery date | October 15, 1995 and November 9, 2002 (moon) |
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Designations
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| MPC designation | (48639) 1995 TL8 |
| Alternative names | none |
| Minor planet category |
Scattered disk object |
| Epoch March 6, 2006 (JD 2453800.5) | |
| Aphelion | 9,643.4 Gm (64.462 AU) |
| Perihelion | 5,986.3 Gm (40.016 AU) |
| Semi-major axis | 7,814.8 Gm (52.239 AU) |
| Eccentricity | 0.234 |
| Orbital period | 137,907 d (377.57 a) |
| Average orbital speed | 4.06 km/s |
| Mean anomaly | 33.6° |
| Inclination | 0.2° |
| Longitude of ascending node | 260.7° |
| Argument of perihelion | 83.4° |
| Satellites | 1 |
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Physical characteristics
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| Dimensions | ~350 and ~160 km (binary) |
| Mass | ~4.5 and ~0.4 ×1019 kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | ~0.10 and ~0.04 m/s² |
| Escape velocity | ~0.18 and ~0.08 km/s |
| Sidereal rotation period |
? d |
| Albedo | 0.10? |
| Temperature | ~38 K |
| Spectral type | ? |
| Absolute magnitude | 5.28 and 6.98 |
(48639) 1995 TL8 (also written (48639) 1995 TL8) is a trans-Neptunian object of the Scattered disk object (SDO) subclass, and possesses a very large satellite.
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[edit] Discovery
Discovered in 1995 by Arianna E. Gleason as part of the Spacewatch project, it was the first of the bodies presently classified as a Scattered disk object (SDO) to be discovered, preceding the SDO prototype (15874) 1996 TL66 by almost a year.
[edit] Satellite
A companion was discovered by Denise C. Stephens and Keith S. Noll from observations with the Hubble Space Telescope taken on November 9, 2002 and announced on October 5, 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 km to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of 161 km [1].
[edit] General
(48639) 1995 TL8 is unusual in being one of the few objects with a perihelion beyond 40 AU, well outside of Neptune's orbit.
The diameters given are derived from an albedo guess of 0.09, being typical for trans-Neptunian objects [2].
[edit] External links
- 1999 MPEC listing
- 2000 MPEC listing
- list of known TNOs, including size estimates
- Johnston Archive entry about the satellite
- IAU minor planet lists
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