988 Appella
988 Appella, provisional designation 1922 MT, is a dark Themistian asteroid and slow rotator from the outer region of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 10 November 1922, by Russian–French astronomer Benjamin Jekhowsky at Algiers Observatory in Algeria, North Africa. The asteroid was later named after French mathematician Paul Émile Appel.
| Discovery | |
|---|---|
| Discovered by | B. Jekhovsky |
| Discovery site | Algiers Obs. |
| Discovery date | 10 November 1922 |
| Designations | |
MPC designation | (988) Appella |
| Pronunciation | /əˈpɛlə/ |
Named after | Paul Appell (French mathematician) |
Alternative designations | 1922 MT · 1955 QJ1 |
Minor planet category | main-belt · Themis |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 76.56 yr (27,964 days) |
| Aphelion | 3.8829 AU |
| Perihelion | 2.4017 AU |
Semi-major axis | 3.1423 AU |
| Eccentricity | 0.2357 |
Orbital period (sidereal) | 5.57 yr (2,035 days) |
Mean anomaly | 308.57° |
Mean motion | 0° 10m 36.84s / day |
| Inclination | 1.5748° |
Longitude of ascending node | 41.726° |
| 337.28° | |
| Physical characteristics | |
| Dimensions | 20.431±0.215 km 20.44±0.33 km 21.7±2.2 km 22±2 km 25.77 km (derived) 25.91±1.2 km (IRAS:18) 30.09±0.37 km |
Synodic rotation period | 7.0±1.0 h (dated) 120 h |
| 0.0609 (derived) 0.066±0.002 0.08±0.02 0.0871±0.009 (IRAS:18) 0.09±0.02 0.097±0.021 0.1401±0.0208 | |
| S | |
| 11.2 · 11.50 · 11.50±0.27 · 11.60 | |
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