1998 WW31
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Template:Mp, is a non-resonant trans-Neptunian object and binary system from the Kuiper belt located in the outermost region of the Solar System, approximately Script error: No such module "convert". in diameter. It was first observed on 18 November 1998, by American astronomer Marc Buie and Robert Millis at the Kitt Peak National Observatory in Arizona, United States.[1][2][3] In December 2000, a minor-planet moon, designated [[#Satellite|S/2000 (Template:Mp) 1]] with a diameter of Script error: No such module "convert"., was discovered in its orbit.[4] After Charon in 1978, it was the first of nearly 100 satellites since discovered in the outer Solar System.[2][4]
Orbit and classification
Located beyond the orbit of Neptune, Template:Mp is a non-resonant classical Kuiper belt object (cubewano) of the so-called hot population, which have higher inclinations than those of the cold population.[5][6] It orbits the Sun at a distance of 40.4–48.5 AU once every 297 years (108,345 days; semi-major axis of 44.48 AU). Its orbit has an eccentricity of 0.09 and an inclination of 7° with respect to the ecliptic.[7] The body's observation arc begins at Kitt Peak with its first observation on 18 November 1998.[3]
Numbering and naming
As of 2025, this minor planet has not been numbered nor named by the Minor Planet Center.[3]
Physical characteristics
Template:Mp is expected to have a low albedo due to its blue (neutral) color.[8] Other sources assume a higher albedo of 0.10 and 0.16, respectively (see below).[9][10] It has a V–I color index of 0.91,[11] notably lower than the mean-color index for cubewanos, and in between that of comets and Jupiter trojans.[12]Template:Rp
Satellite
Template:Mp is a binary minor planet with a minor-planet moon in its orbit. On 22 December 2000, French astronomers Christian Veillet and Alain Doressoundiram in collaboration with J. Shapiro discovered the satellite using the Canada–France–Hawaii Telescope at Mauna Kea on the Big Island of Hawaii, United States. The discovery was announced on 16 April 2001 and received the provisional designation S/2000 (Template:Mp) 1.[4]
It was the first trans-Neptunian binary discovered after Charon in 1978, the largest satellite in the Pluto–Charon system.[2] Since then nearly 100 trans-Neptunian binaries have been discovered. Template:Mp is also one of the most symmetrical binaries known in the Solar System.
The satellite has a highly eccentric orbit with eccentricity of Script error: No such module "val". with an exceptionally long orbital period of Script error: No such module "val". and a semi-major axis of Script error: No such module "val"..[13]
Diameter and albedo
While the primary measures Script error: No such module "convert"., the satellite has a diameter of Script error: No such module "convert". (a ratio of 0.883) with a combined system diameter of Script error: No such module "convert"..[9][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a system diameter of Script error: No such module "convert". based on an absolute magnitude of 6.7,[10] while Mike Brown finds a diameter of Script error: No such module "convert". with a lower albedo of 0.04.[8]
Rotation period
As of 2020, no rotational lightcurve of Template:Mp has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[10][6]
References
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External links
- The binary Kuiper-belt object Template:Mp, publication in Nature, 18 April 2002
- The binary Kuiper Belt Object 1998 WW31, Christian Veillet - CFHT - 17 April 2002
- IAUC 7610: S/2000 (1998 WW_31) 1, satellite discovery – Central Bureau for Astronomical Telegrams, 16 April 2001
- Orbit Fit and Astrometric record for 1998 WW31, Marc W. Buie, SwRI (Space Science Department)
- Template:Mp and S/2000 (Template:Mp) 1
- MPEC 2008-O05 : Distant Minor Planets (2008 AUG. 2.0 TT)
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidataTemplate:WikidataCheck
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