(48639) 1995 TL8
From Wikipedia, the free encyclopedia
- 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.
| Discovery A | |
|---|---|
| Discoverer | A. Gleason (Spacewatch) |
| Discovery date | October 15, 1995 and November 9, 2002 (moon) |
| Alternate designations B |
none |
| Category | Scattered disk object |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.234 |
| Semi-major axis (a) | 7,814.8 Gm (52.239 AU) |
| Perihelion (q) | 5,986.3 Gm (40.016 AU) |
| Aphelion (Q) | 9,643.4 Gm (64.462 AU) |
| Orbital period (P) | 137,907 d (377.57 a) |
| Mean orbital speed | 4.06 km/s |
| Inclination (i) | 0.2° |
| Longitude of the ascending node (Ω) |
260.7° |
| Argument of perihelion (ω) |
83.4° |
| Mean anomaly (M) | 33.6° |
| Physical characteristics D | |
| Dimensions | ~350 and ~160 km (binary) |
| Mass | ~4.5 and ~0.4 ×1019 kg |
| Density | 2.0? g/cm³ |
| Surface gravity | ~0.10 and ~0.04 m/s² |
| Escape velocity | ~0.18 and ~0.08 km/s |
| Rotation period | ? d |
| Spectral class | ? |
| Absolute magnitude | 5.28 and 6.98 |
| Albedo (geometric) | 0.10? |
| Mean surface temperature |
~38 K |
(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.
Contents |
[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
| Minor planets | ||
|---|---|---|
| Previous minor planet | (48639) 1995 TL8 | Next minor planet |
|
|
|---|
| Plutinos : Pluto* | 1993 RO | 1993 RP | 1993 SB | 1993 SC | 1994 TB | 1995 QZ9 | 1996 SZ4 | 1996 TP66 | 38083 Rhadamanthus | 38628 Huya | 28978 Ixion | 2003 VS2 | 90482 Orcus | Unnumbered: 2003 AZ84
Cubewanos: 1992 QB1 | 1994 GV9 | 1994 JQ1 | 1994 VK8 | 1996 TO66 | 58534 Logos| 1998 WW31 | 19521 Chaos | 53311 Deucalion | 20000 Varuna | 2002 AW197 | 50000 Quaoar | 2002 MS4 | 2002 TX300 | 2002 UX25 | 2003 EL61 | 2004 GV9| 2005 FY9 | Unnumbered: | 2003 QW90 | 2005 RN43 Twotinos: 2002 WC19 | 1996 TR66 | Unnumbered: 1998 SM165 | 1997 SZ10 | 1999 RB216 | 2000 JG81 Scattered disc objects: Eris* | 1995 TL8 | 1996 GQ21 | 1996 TL66 | 2000 OO67 | 2000 OM67 | 2001 KC77 | 2001 UR163 | 2002 CY224 | 2002 GX32 | 2002 TC302 | 90377 Sedna** Unnumbered: 2004 XR190 Unclassified Objects : 1994 JS | 1994 JR1 | 1995 DA2 | 1995 SM55 | 1996 TQ66 | 1997 CR29 | 1997 CS29 | 1997 CU29 | 1997 QJ4 | 1998 HJ151 | 1998 HK151 | 1998 HP151 | 1998 HM151 | 1998 KR65 | 1998 SM165 | 1998 SN1651998 US43 | 1998 VG44 | 1998 WW24 | 1998 WA31 | 1998 WU31 | 1998 WA25 | 1999 CP133 | 1999 CL158 | 1999 CC158 | 1999 DF9 | 1999 HT11 | 1999 HB12 | 1999 HC12 | 1999 KR16 | 1999 OY3 Natural satellites : Charon (Pluto) | Hydra (Pluto) | Nix (Pluto) | Dysnomia (Eris) | S/2000 (1998 WW31) 1 | S/2005 (2003 EL61) 1 | S/2005 (2003 EL61) 2 | (58534) Logos I Zoe |
| * - Also classified as a dwarf planet ** - Currently classified as an SDO, though may be part of the Inner Oort Cloud |
|
|
|---|
| Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud) |
| For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
 |
This article about a centaur or trans-Neptunian object is a stub. You can help Wikipedia by expanding it. |
