1368 Numidia
1368 Numidia, provisional designation 1935 HD, is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 30 April 1935, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was named after the ancient North African kingdom of Numidia.
Modelled shape of Numidia from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 30 April 1935 |
| Designations | |
MPC designation | (1368) Numidia |
| Pronunciation | /njuːˈmɪdiə/ |
Named after | Numidia (ancient Berber kingdom) |
Alternative designations | 1935 HD · 1928 SN 1931 JF · 1935 KB 1936 QN · 1953 YK |
Minor planet category | main-belt · (inner) background · Maria |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.45 yr (31,577 days) |
| Aphelion | 2.6814 AU |
| Perihelion | 2.3673 AU |
Semi-major axis | 2.5243 AU |
| Eccentricity | 0.0622 |
Orbital period (sidereal) | 4.01 yr (1,465 days) |
Mean anomaly | 146.05° |
Mean motion | 0° 14m 44.52s / day |
| Inclination | 14.823° |
Longitude of ascending node | 18.130° |
| 264.36° | |
| Physical characteristics | |
| Dimensions | 15.93±0.37 km 19.24 km (derived) 19.29±0.9 km 19.591±0.213 km 19.899±0.110 km 20.66±0.82 km |
Synodic rotation period | 3.64 h 3.640739 h 3.640740 h |
| 0.177±0.016 0.1838±0.0295 0.1918 (derived) 0.2035±0.019 0.298±0.021 | |
| S (assumed) B–V = 0.860 U–B = 0.360 | |
| 10.92 · 10.99 | |
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