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(48639) 1995 TL8

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.
(48639) 1995 TL8
Discovery
Discovered by A. Gleason (Spacewatch)
Discovery date October 15, 1995 and
November 9, 2002 (moon)
Designations
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
Physical characteristics
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.

Contents

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.

Satellite

A relative size and distance comparison of the (48639) 1995 TL8 system with the Earth / Moon system. The scale of the Earth / Moon system has been reduced so Earth appears the same size as the (48639) 1995 TL8 primary.

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].

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].

External links

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Lists: Minor planets · Asteroid groups and families · Binary asteroids · Asteroid moons
See also: Near-Earth object · Dwarf planet · Planet · Solar System · Pronunciation of asteroid names · Meanings of asteroid names.
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