642 Clara

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]

642 Clara

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	5.70 yr (2082.4 d)
Mean anomaly	307.116°
Mean motion	0° 10^m 22.368^s / day
Inclination	8.1702°
Longitude of ascending node	5.9035°
Argument of perihelion	118.101°
Physical characteristics
Mean radius	16.68±0.75 km
Rotation period	8.2308 h (0.34295 d)
Geometric albedo	0.1617±0.015
Absolute magnitude (H)	9.98

References

1. "642 Clara (1907 ZY)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
2. 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
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 642 Clara at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters