229762 Gǃkúnǁʼhòmdímà
Trans-Neptunian object / From Wikipedia, the free encyclopedia
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229762 Gǃkúnǁʼhòmdímà (provisional designation 2007 UK126) is a trans-Neptunian object and binary system from the extended scattered disc, located in the outermost region of the Solar System.[15] It was discovered on 19 October 2007 by American astronomers Megan Schwamb, Michael Brown, and David Rabinowitz at the Palomar Observatory in California[1] and measures approximately 600 kilometers (400 miles) in diameter. This medium-sized TNO appears to be representative of a class of mid-sized objects under approximately 1000 km that have not collapsed into fully solid bodies. Its 100-kilometer moon was discovered by Keith Noll, Will Grundy, and colleagues with the Hubble Space Telescope in 2008,[16][7][9][17] and named Gǃòʼé ǃHú.
Discovery[1][2][3] | |
---|---|
Discovered by | M. E. Schwamb M. E. Brown D. L. Rabinowitz |
Discovery site | Palomar Obs. |
Discovery date | 19 October 2007 |
Designations | |
(229762) Gǃkúnǁʼhòmdímà | |
Pronunciation |
|
Named after | Gǃkúnǁʼhòmdímà[4] (San mythology) |
2007 UK126 | |
Symbol | (astrological) |
Orbital characteristics[5] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 2 · 3[1] | |
Observation arc | 36.16 yr (13,209 d) |
Earliest precovery date | 16 August 1982[1] |
Aphelion | 108.058 AU (16.1652 Tm) |
Perihelion | 37.5449328 AU (5.61664200 Tm) |
72.8013046 AU (10.89092015 Tm) | |
Eccentricity | 0.4843 |
620.17 yr (226,517 d) | |
344.21° | |
0° 0m 5.76s / day | |
Inclination | 23.378° |
131.09° | |
≈ 24 February 2046[8] ±1 days | |
346.88° | |
Known satellites | 1 (Gǃòʼé ǃHú)[9] |
Physical characteristics | |
Dimensions | 678.0±11 × 611.4±18 km occultation[10] |
Mean diameter | 642±28[10] 599–629 km[11] 638+24 −12 km sphere-equivalent (elliptical fit)[12] |
Flattening | 0.105+0.05 −0.04[12] 0.118+0.055 −0.048[12] |
Mass | (1.361±0.033)×1020 kg[4] (total system mass) |
Mean density | 1.04±0.17 g/cm3, based on an effective diameter of 632±34 km[4] |
possibly 11.05 h,[13] within 11 to 41 hours[4] | |
0.142±0.015[10] 0.150±0.016[11] 0.159+0.007 −0.013[12] | |
Temperature | 50–55 K max.[11] |
V–R=0.62±0.05[14] V–I=1.028±0.027[4] | |
20.8[3] | |
HV=3.69±0.04; HR=3.07±0.04[11] | |