1909 Alekhin
1909 Alekhin, provisional designation 1972 RW2, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 4 September 1972, by Russian–Ukrainian astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory, Nauchnyj, on the Crimean peninsula, and named after chess grandmaster and World Chess Champion Alexander Alekhine.
| Discovery | |
|---|---|
| Discovered by | L. Zhuravleva |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 4 September 1972 |
| Designations | |
MPC designation | (1909) Alekhin |
Named after | Alexander Alekhine (chess grandmaster) |
Alternative designations | 1972 RW2 · 1926 GU 1930 KF · 1930 KM 1934 NZ · 1934 OC 1941 FJ · 1960 FD 1969 UU · 1971 DL |
Minor planet category | main-belt · (inner) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.06 yr (33,259 days) |
| Aphelion | 2.9693 AU |
| Perihelion | 1.8758 AU |
Semi-major axis | 2.4226 AU |
| Eccentricity | 0.2257 |
Orbital period (sidereal) | 3.77 yr (1,377 days) |
Mean anomaly | 53.882° |
Mean motion | 0° 15m 41.04s / day |
| Inclination | 1.7955° |
Longitude of ascending node | 227.46° |
| 5.6412° | |
| Physical characteristics | |
| Dimensions | 15.45±9.22 km 17.33 km (derived) 17.42±1.5 km (IRAS:15) 18.59±0.37 km 18.681±0.043 18.847±0.129 km |
Synodic rotation period | 148.2252±0.6228 h 148.6±0.2 h |
| 0.0446 (derived) 0.0460±0.0018 0.060±0.004 0.062±0.003 0.067±0.083 0.0700±0.014 (IRAS:15) | |
| S | |
| 12.30 · 12.44±0.32 · 12.60 · 12.646±0.003 (R) · 12.8 · 12.9 · 12.91±0.07 | |
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