| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg |
| Discovery date | 8 September 1907 |
| Designations | |
| MPC designation | (642) Clara |
| Alternative designations | 1907 ZY |
| Orbital characteristics | |
| 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° 10 22.368 / 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 |
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.
References
- "642 Clara (1907 ZY)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
- Schmadel, Lutz D. (2007). "(642) Clara". Dictionary of Minor Planet Names – (642) Clara. Springer Berlin Heidelberg. p. 64. doi:10.1007/978-3-540-29925-7_643. ISBN 978-3-540-00238-3.
External links
- 642 Clara at AstDyS-2, Asteroids—Dynamic Site
- 642 Clara at the JPL Small-Body Database
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