Orbit update
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m Disambiguating links to Julian year (link changed to Julian year (astronomy)) using DisamAssist.
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| semimajor = 47.042 AU |
| semimajor = 47.042 AU |
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| eccentricity = 0.13009 |
| eccentricity = 0.13009 |
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| period = 322.65 [[Julian year|yr]] (117,848 [[Julian day|d]]) |
| period = 322.65 [[Julian year (astronomy)|yr]] (117,848 [[Julian day|d]]) |
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| mean_anomaly = 294.532[[Degree (angle)|°]] |
| mean_anomaly = 294.532[[Degree (angle)|°]] |
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| mean_motion = {{Deg2DMS|0.003055|sup=ms}} / day |
| mean_motion = {{Deg2DMS|0.003055|sup=ms}} / day |
Discovery [1][2] | |
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Discovered by | Palomar Obs. (team) |
Discovery site | Palomar Obs. |
Discovery date | 10 January 2002 |
Designations | |
(55565) 2002 AW197 | |
2002 AW197 | |
TNO [3] · cubewano [4] p-DP [5] · extended [6] distant [1] | |
Orbital characteristics [3] | |
Epoch 31 May 2020 (JD 2459000.5) | |
Uncertainty parameter3 | |
Observation arc | 21.23 yr (7,756 d) |
Earliest precovery date | 29 December 1997 |
Aphelion | 53.161 AU |
Perihelion | 40.922 AU |
47.042 AU | |
Eccentricity | 0.13009 |
322.65 yr (117,848 d) | |
294.532° | |
0° 0m 10.998s / day | |
Inclination | 24.451° |
297.606° | |
297.494° | |
Physical characteristics | |
768±39 km[7] 734±116 km[8] 700±50 km[9][10] 886km[11] | |
8.87±0.01 h[12] 8.78±0.05 h[13] 8.86±0.01 h[14] | |
0.112+0.012 −0.011[7] | |
IR [15][16] · (moderately red) B–V = 0.920±0.020[17] V–R = 0.560±0.020[17] V–I = 1.170±0.010[16] | |
20.0 (opposition)[18][19] | |
3.568±0.046 (V)[20] 3.156±0.059 (R)[21] 3.3 (assumed)[3] | |
(55565) 2002 AW197, provisional designation 2002 AW197, is a classical, non-resonant trans-Neptunian object from the Kuiper belt in the outermost region of the Solar System, also known as cubewano. With a diameter of at least 700 kilometers (430 miles), Brown considers it a highly likely dwarf planet candidate.[5] Tancredi notes that photometric observations suggest that it is a spheroid with a high albedo and small albedo spots.[22] However, its low albedo suggests it does not have planetary geology. It was discovered at Palomar Observatory in 2002 and has a rotation period of 8.8 hours and a moderately red color.[15]
2002 AW197 was discovered on 10 January 2002, by astronomers at the Palomar Observatory in California.[1] Astronomers involved in the discovery were Michael Brown, Chad Trujillo, Eleanor Helin, Michael Hicks, Kenneth Lawrence and Steven H. Pravdo.[2] It is located near the Kuiper cliff.
It orbits the Sun at a distance of 40.9–53.2 AU once every 322.6 years (over 117,800 days; semi-major axis of 47 AU). Its orbit has an eccentricity of 0.13 and an inclination of 24° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at Haleakala-NEAT/GEODSS (566) in December 1997, more than 4 years prior to its official discovery observation at Palomar.[1] At 45.4 AU from the Sun,[18] it continues to slowly approach the Sun until its perihelion passage at 41.1 AU in May 2077.[3]
Combined observations of thermal emissions by the Herschel Space Observatory and Spitzer Space Telescope give a diameter of 768+39
−38 km and a geometric albedo of 0.112+0.012
−0.011[7]
ESO analysis of spectra reveals a strong red slope and no presence of water ice[23] (in contrast to Quaoar, also red) suggesting organic material (see comparison of colours and typical composition inferred from spectra of the TNOs).
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TNO classes |
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Dwarf planets (moons) |
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Sednoids |
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