1177 Gonnessia
1177 Gonnessia, provisional designation 1930 WA, is a dark background asteroid from the outer regions of the asteroid belt, approximately 99 kilometers in diameter. It was discovered on 24 November 1930, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa, and named after astronomer François Gonnessiat.
| Discovery | |
|---|---|
| Discovered by | L. Boyer |
| Discovery site | Algiers Obs. |
| Discovery date | 24 November 1930 |
| Designations | |
MPC designation | (1177) Gonnessia |
Named after | François Gonnessiat (French astronomer) |
Alternative designations | 1930 WA · A923 RO |
Minor planet category | main-belt · (outer) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.28 yr (31,513 days) |
| Aphelion | 3.4519 AU |
| Perihelion | 3.2440 AU |
Semi-major axis | 3.3480 AU |
| Eccentricity | 0.0310 |
Orbital period (sidereal) | 6.13 yr (2,238 days) |
Mean anomaly | 344.46° |
Mean motion | 0° 9m 39.24s / day |
| Inclination | 15.071° |
Longitude of ascending node | 252.16° |
| 241.85° | |
| Physical characteristics | |
| Dimensions | 91.98±9.9 km 93.50±1.01 km 99.27±43.41 km 104.63±33.73 km |
Synodic rotation period | 6.81±0.01 h (poor) 10 h 28.89±0.02 h 30.51±0.02 h 30.51 h 82±5 h |
| 0.03±0.02 0.03±0.04 0.0398±0.010 0.040±0.001 | |
| Tholen = XFU · X B–V = 0.668 U–B = 0.244 | |
| 8.86±0.13 (R) · 9.24 · 9.24±0.139 · 9.30 · 9.35 · 9.4 · 9.66±0.60 | |
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