1246 Chaka
1246 Chaka, provisional designation 1932 OA, is a background asteroid from the central regions of the asteroid belt, approximately 18 kilometers (11 miles) in diameter. It was discovered on 23 July 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The uncommon A/Sl-type asteroid has a longer than average rotation period of 25.5 hours. It was named for the Zulu King Shaka.
| Discovery | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 23 July 1932 |
| Designations | |
MPC designation | (1246) Chaka |
Named after | Shaka (King of the Zulus) |
Alternative designations | 1932 OA |
Minor planet category | main-belt · (middle) background |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.29 yr (31,519 d) |
| Aphelion | 3.4329 AU |
| Perihelion | 1.8068 AU |
Semi-major axis | 2.6198 AU |
| Eccentricity | 0.3103 |
Orbital period (sidereal) | 4.24 yr (1,549 d) |
Mean anomaly | 128.91° |
Mean motion | 0° 13m 56.64s / day |
| Inclination | 16.004° |
Longitude of ascending node | 290.52° |
| 54.847° | |
| Physical characteristics | |
Mean diameter | 17.634±0.498 km 17.73±3.89 km 18.11±0.9 km 19.596±0.035 km 20.84±1.39 km |
Synodic rotation period | 25.462±0.001 h |
| 0.195 0.2045 0.2351 0.26 0.310 | |
| A (S3OS2-TH) Sl (S3OS2-BB) | |
| 10.8 10.9 | |
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