1397 Umtata
1397 Umtata, provisional designation 1936 PG, is an asteroid from the background population of the asteroid belt's central region, approximately 21 kilometers in diameter. It was discovered by South-African astronomer Cyril Jackson at the Union Observatory in Johannesburg on 9 August 1936. The asteroid was named after the South-African town of Mthatha, formerly known as Umtata.
| Discovery | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 9 August 1936 |
| Designations | |
MPC designation | (1397) Umtata |
Named after | Mthatha (South-African town) |
Alternative designations | 1936 PG · 1931 GK 1945 QF · 1945 RC 1948 EB1 |
Minor planet category | main-belt · (middle) background |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.14 yr (29,638 days) |
| Aphelion | 3.3646 AU |
| Perihelion | 1.9967 AU |
Semi-major axis | 2.6806 AU |
| Eccentricity | 0.2551 |
Orbital period (sidereal) | 4.39 yr (1,603 days) |
Mean anomaly | 173.37° |
Mean motion | 0° 13m 28.56s / day |
| Inclination | 3.5109° |
Longitude of ascending node | 77.437° |
| 206.53° | |
| Physical characteristics | |
| Dimensions | 20.35±0.30 km 20.40 km (derived) 20.798±0.292 km 22.895±0.285 km |
Synodic rotation period | 30 h |
| 0.0794±0.0140 0.084±0.046 0.10 (assumed) 0.112±0.004 | |
| S/C B–V = 0.690 U–B = 0.210 | |
| 11.47 · 11.57 | |
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