1021 Flammario
1021 Flammario, provisional designation 1924 RG, is a dark background asteroid from the central regions of the asteroid belt, approximately 100 kilometers (62 miles) in diameter. It was discovered on 11 March 1924, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany. The asteroid was named after French astronomer Camille Flammarion. The uncommon F-type asteroid has a rotation period of 12.16 hours.
Shape model of Flammario from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 11 March 1924 |
| Designations | |
MPC designation | (1021) Flammario |
Named after | Camille Flammarion (French astronomer) |
Alternative designations | 1924 RG · 1977 UM A910 CE |
Minor planet category | main-belt · (outer) background |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.70 yr (33,857 d) |
| Aphelion | 3.5188 AU |
| Perihelion | 1.9556 AU |
Semi-major axis | 2.7372 AU |
| Eccentricity | 0.2855 |
Orbital period (sidereal) | 4.53 yr (1,654 d) |
Mean anomaly | 10.840° |
Mean motion | 0° 13m 3.36s / day |
| Inclination | 15.869° |
Longitude of ascending node | 115.44° |
| 286.97° | |
| Physical characteristics | |
Mean diameter | 84.78±22.26 km 97.38±1.23 km 97.96±34.85 km 98.015±8.377 km 99.27±3.27 km 99.39±2.3 km 99.6±19.9 km 100.765±1.608 km 105±11 km |
| Mass | (5.14±0.12)×1018 kg |
Mean density | 10.03±1.02 g/cm3 |
Synodic rotation period | 12.146±0.001 h 12.146 h 12.15186±0.00005 h 12.160±0.002 h 12.16 h |
| 0.04±0.01 0.04±0.06 0.045±0.006 0.0458±0.002 0.0470±0.0200 0.048±0.001 0.05±0.02 | |
| Tholen = F · F SMASS = B B–V = 0.656 U–B = 0.230 | |
| 8.98 9.03 · 9.34±0.27 | |
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