Global Information1191 Alfaterna information
| Discovery[1] | |
|---|---|
| Discovered by | L. Volta |
| Discovery site | Pino Torinese Obs. |
| Discovery date | 11 February 1931 |
| Designations | |
MPC designation | (1191) Alfaterna |
| Pronunciation | /ælfəˈtɜːrnə/[2] |
Named after | Nuceria Alfaterna (ancient Roman town)[3] |
Alternative designations | 1931 CA · 1965 AA |
Minor planet category | main-belt · (outer)[4] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.79 yr (31,335 days) |
| Aphelion | 3.0286 AU |
| Perihelion | 2.7567 AU |
Semi-major axis | 2.8927 AU |
| Eccentricity | 0.0470 |
Orbital period (sidereal) | 4.92 yr (1,797 days) |
Mean anomaly | 178.01° |
Mean motion | 0° 12m 1.08s / day |
| Inclination | 18.491° |
Longitude of ascending node | 134.73° |
Argument of perihelion | 53.411° |
| Physical characteristics | |
| Dimensions | 38.92±13.94 km[5] 42.01 km (derived)[4] 42.09±3.0 km[6] 43.38±14.16 km[7] 46.11±0.63 km[8] 46.375±0.836 km[9] 47.397±0.175 km[10] |
Synodic rotation period | 3.664 h (removed)[4][a] 33.12±1.92 (tentative)[11] |
Geometric albedo | 0.0297±0.0053[9] 0.04±0.02[7] 0.04±0.05[5] 0.045±0.008[10] 0.0479 (derived)[4] 0.050±0.002[8] 0.0574±0.009[6] |
Spectral type | C[4] |
Absolute magnitude (H) | 10.60[6][8][9] · 10.77[7] · 10.8[1][4][5] · 10.89±0.21[12] |
1191 Alfaterna, provisional designation 1931 CA, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 43 kilometers in diameter. It was discovered on 11 February 1931, by Italian astronomer Luigi Volta at the Observatory of Turin in northwestern Italy.[13] The asteroid was named for the ancient Roman town of Nuceria Alfaterna.[3]
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