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Encyclopedia > (48639) 1995 TL8
(48639) 1995 TL8
[[Image:|275px|]]
Discovery A
Discoverer A. Gleason (Spacewatch)
Discovery date October 15, 1995 and
November 9, 2002 (moon)
Alternate
designations
none B
Category Scattered disk object
Orbital elements C
Epoch March 6, 2006 (JD 2453800.5)
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 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 subclass, and posesses a very large satellite. Spacewatch is a project at the University of Arizona that specializes in the study of minor planets, and including various types of asteroids and comets. ... October 15 is the 288th day of the year (289th in Leap years). ... 1995 (MCMXCV in Roman) was a common year starting on Sunday of the Gregorian calendar. ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 2002 (MMII) was a common year starting on Tuesday of the Gregorian calendar. ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... Minor planets, or planetoids are minor bodies of the Solar system orbiting the Sun (or of other planetary systems orbiting other stars) that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a... A scattered disk object (or scattered disc object or SDO) is a trans-Neptunian object of the Kuiper belt with a very eccentric orbit. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... March 6 is the 65th day of the year in the Gregorian Calendar (66th in Leap years). ... 2006 (MMVI in Roman) is a common year starting on Sunday of the Gregorian calendar. ... The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... Giga (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre (Commonwealth English) or meter (American English) (symbol: m) is the SI base unit of length. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A day (symbol: d) is a unit of time equal to 24 hours. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... For the majority of numbered asteroids, almost nothing is known apart from a few physical parameters. ... Mass is a property of a physical object that quantifies the amount of matter it contains. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... It has been suggested that gravitation be merged into this article or section. ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us. ... The albedo is a measure of reflectivity of a surface or body. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ... A scattered disk object (or scattered disc object or SDO) is a trans-Neptunian object of the Kuiper belt with a very eccentric orbit. ...

Contents


Discovery

Discovered in 1995 by A. 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, preceeding the SDO prototype (15874) TL66 by almost a year. 1995 (MCMXCV in Roman) was a common year starting on Sunday of the Gregorian calendar. ... Spacewatch is a project at the University of Arizona that specializes in the study of minor planets, and including various types of asteroids and comets. ... A scattered disk object (or scattered disc object or SDO) is a trans-Neptunian object of the Kuiper belt with a very eccentric orbit. ... (15874) 1996 TL66 is a trans-Neptunian object that resides in the Kuyper belt. ...


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 is relatively quite 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 [1]. The Hubble Space Telescope (HST) is a telescope in orbit around the Earth. ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 2002 (MMII) was a common year starting on Tuesday of the Gregorian calendar. ... October 5 is the 278th day of the year (279th in Leap years). ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...


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. This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... Adjective Neptunian Atmospheric characteristics Surface pressure ≫100 MPa Hydrogen - H2 80% ±3. ...


The diameters given are derived from an albedo guess of 0.09, being typical for trans-Neptunian objects [2].


External links

… | Previous minor planet | (48639) 1995 TL8 | Next minor planet | …



The minor planetsedit
Vulcanoids | Main belt | Groups and families | Near-Earth asteroids | Jupiter Trojans
Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud)
For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system
For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.

 
 

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