4000 Hipparchus
Main-belt asteroid / From Wikipedia, the free encyclopedia
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4000 Hipparchus /hɪˈpɑːrkəs/ is a dark background asteroid from the central regions of the asteroid belt, approximately 17 kilometers (11 miles) in diameter. It was discovered on 4 January 1989, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaido, Japan.[1] The likely carbonaceous asteroid has a short rotation period of 3.4 hours.[13] It was named for the ancient Greek astronomer Hipparchus.[3]
Quick Facts Discovery, Discovered by ...
Discovery [1] | |
---|---|
Discovered by | S. Ueda H. Kaneda |
Discovery site | Kushiro Obs. |
Discovery date | 4 January 1989 |
Designations | |
(4000) Hipparchus | |
Pronunciation | /hɪˈpɑːrkəs/[2] |
Named after | Hipparchus [3] (ancient Greek astronomer) |
1989 AV · 1963 XA 1975 TW4 · 1977 FZ2 1978 NG8 · 1979 WU4 1984 YX5 · 1987 SD18 | |
main-belt [1][4] · (middle) background [5] · Astraea [6] | |
Orbital characteristics [4] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 0 | |
Observation arc | 63.50 yr (23,192 d) |
Aphelion | 2.8835 AU |
Perihelion | 2.2968 AU |
2.5901 AU | |
Eccentricity | 0.1133 |
4.17 yr (1,523 d) | |
78.842° | |
0° 14m 11.04s / day | |
Inclination | 2.7163° |
318.53° | |
173.15° | |
Physical characteristics | |
Mean diameter | 15.13±4.81 km[7] 17.485±0.032 km[8][9] 18.217±0.094 km[10] 18.87±0.59 km[11] |
3.418±0.001 h[12] | |
0.0388[10] 0.046[11] 0.05[7] 0.052[8][9] | |
12.60[8][10][11] 12.8[1][4][13] 13.01[7] | |
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