642 Clara is a minor planet orbiting the Sun. Discovered by Max Wolf in 1907, it is named after one of the housekeepers in Wolf's household.[2]
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg |
| Discovery date | 8 September 1907 |
| Designations | |
MPC designation | (642) Clara |
Alternative designations | 1907 ZY |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 108.42 yr (39599 d) |
| Aphelion | 3.5799 AU (535.55 Gm) |
| Perihelion | 2.8028 AU (419.29 Gm) |
Semi-major axis | 3.1914 AU (477.43 Gm) |
| Eccentricity | 0.12176 |
Orbital period (sidereal) | 5.70 yr (2082.4 d) |
Mean anomaly | 307.116° |
Mean motion | 0° 10m 22.368s / day |
| Inclination | 8.1702° |
Longitude of ascending node | 5.9035° |
Argument of perihelion | 118.101° |
| Physical characteristics | |
Mean radius | 16.68±0.75 km |
Synodic rotation period | 8.2308 h (0.34295 d) |
Geometric albedo | 0.1617±0.015 |
Absolute magnitude (H) | 9.98 |
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