Happelia (minor planet designation: 578 Happelia) is a minor planet orbiting the Sun. On 24 February 2017 a possible small 3-kilometer moon was found orbiting the asteroid, based on occultation observations.[2]
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![]() A three-dimensional model of 578 Happelia based on its light curve | |
Discovery | |
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Discovered by | M. F. Wolf |
Discovery site | Heidelberg |
Discovery date | 1 November 1905 |
Designations | |
MPC designation | (578) Happelia |
Alternative designations | 1905 RZ |
Orbital characteristics[1] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 110.46 yr (40344 d) |
Aphelion | 3.2821 AU (491.00 Gm) |
Perihelion | 2.2168 AU (331.63 Gm) |
Semi-major axis | 2.7494 AU (411.30 Gm) |
Eccentricity | 0.19374 |
Orbital period (sidereal) | 4.56 yr (1665.2 d) |
Mean anomaly | 200.53° |
Mean motion | 0° 12m 58.284s / day |
Inclination | 6.1525° |
Longitude of ascending node | 29.411° |
Argument of perihelion | 261.400° |
Physical characteristics | |
Mean radius | 34.645±1.05 km |
Synodic rotation period | 10.061 h (0.4192 d) |
Geometric albedo | 0.0769±0.005 |
Absolute magnitude (H) | 9.4 |
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