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From Wikipedia, the free encyclopedia
(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]
1995 TL8 and its satellite (unresolved) imaged by the Hubble Space Telescope | |
| Discovery[1][2] | |
|---|---|
| Discovered by | A. Gleason (Spacewatch) |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 15 October 1995 |
| Designations | |
| (48639) 1995 TL8 | |
| 1995 TL8 | |
| TNO[1] · Other TNO[3] detached[4] · distant[2] | |
| Orbital characteristics[1] | |
| 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 |
| 52.578 AU | |
| Eccentricity | 0.2404 |
| 381.25 yr (139,251 days) | |
| 46.972° | |
| 0° 0m 9.36s / day | |
| Inclination | 0.2499° |
| 260.007° | |
| 84.397° | |
| Known satellites | 1 (D: 80 km)[5] |
| Physical characteristics | |
| Dimensions | 176 km[5] 420.27 km (calculated)[6] 495 km (estimated)[7] |
| 0.07 (estimated)[7] 0.10 (assumed)[6] 0.369[5] | |
| RR[8] · C (assumed)[6] | |
| 4.667±0.091 (R)[9] · 4.8[1][6] · 5.1[7] · 5.290±0.060[lower-alpha 1] | |
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.[10]
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]
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.[11]
This minor planet was numbered by the Minor Planet Center on 20 November 2002.[12] As of 2018, it has not been named.[2]
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