4000 Hipparchus
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. The likely carbonaceous asteroid has a short rotation period of 3.4 hours. It was named for the ancient Greek astronomer Hipparchus.
| Discovery | |
|---|---|
| Discovered by | S. Ueda H. Kaneda |
| Discovery site | Kushiro Obs. |
| Discovery date | 4 January 1989 |
| Designations | |
MPC designation | (4000) Hipparchus |
| Pronunciation | /hɪˈpɑːrkəs/ |
Named after | Hipparchus (ancient Greek astronomer) |
Alternative designations | 1989 AV · 1963 XA 1975 TW4 · 1977 FZ2 1978 NG8 · 1979 WU4 1984 YX5 · 1987 SD18 |
Minor planet category | main-belt · (middle) background · Astraea |
| Orbital characteristics | |
| 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 |
Semi-major axis | 2.5901 AU |
| Eccentricity | 0.1133 |
Orbital period (sidereal) | 4.17 yr (1,523 d) |
Mean anomaly | 78.842° |
Mean motion | 0° 14m 11.04s / day |
| Inclination | 2.7163° |
Longitude of ascending node | 318.53° |
| 173.15° | |
| Physical characteristics | |
Mean diameter | 15.13±4.81 km 17.485±0.032 km 18.217±0.094 km 18.87±0.59 km |
Synodic rotation period | 3.418±0.001 h |
| 0.0388 0.046 0.05 0.052 | |
| 12.60 12.8 13.01 | |
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