1319 Disa
1319 Disa, provisional designation 1934 FO, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 19 March 1934, by English-born, South African astronomer Cyril Jackson at Johannesburg Observatory in South Africa. It is named for the orchid Disa.
| Discovery | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 19 March 1934 |
| Designations | |
MPC designation | (1319) Disa |
| Pronunciation | /ˈdaɪsə/ |
Named after | Disa (orchid – flowering plant) |
Alternative designations | 1934 FO · 1929 GE 1970 FM · A908 EA |
Minor planet category | main-belt · (outer) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.20 yr (39,885 days) |
| Aphelion | 3.6026 AU |
| Perihelion | 2.3684 AU |
Semi-major axis | 2.9855 AU |
| Eccentricity | 0.2067 |
Orbital period (sidereal) | 5.16 yr (1,884 days) |
Mean anomaly | 41.069° |
Mean motion | 0° 11m 27.96s / day |
| Inclination | 2.8007° |
Longitude of ascending node | 256.10° |
| 316.25° | |
| Physical characteristics | |
| Dimensions | 16.88±1.12 km 24.00±0.37 km 25.651±0.321 km 25.894±0.180 km 40.33 km (calculated) |
Synodic rotation period | 7.080±0.003 h 7.082±0.001 h 7.0820±0.0077 h |
| 0.057 (assumed) 0.0959±0.0034 0.097±0.012 0.116±0.004 0.391±0.038 | |
| P · C | |
| 10.391±0.002 (R) · 10.50 · 10.7 · 11.1 | |
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