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Discovery and designation
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| Discovered by | S. J. Bus | |||||||||
| Discovery date | March 2, 1981 | |||||||||
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Designations
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| MPC designation | (9921) 1981 EO18 | |||||||||
| Minor planet category |
Main Belt asteroid | |||||||||
| Epoch October 27, 2007 | ||||||||||
| Ap | 2.5177340 AU | |||||||||
| Peri | 2.2375754 AU | |||||||||
| Semi-major axis | 2.3776547 AU | |||||||||
| Eccentricity | 0.0589149 | |||||||||
| Orbital period | 1339.1264937 d | |||||||||
| Mean anomaly | 202.94141° | |||||||||
| Inclination | 2.39925° | |||||||||
| Longitude of ascending node | 331.52802° | |||||||||
| Argument of peri | 88.95675° | |||||||||
| Dimensions | ~12.3 km[1] | |||||||||
| Geometric albedo | ~0.01 | |||||||||
| Surface temp. Kelvin Celsius |
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| Absolute magnitude (H) | 14.3 | |||||||||
(9921) 1981 EO18 is a main belt asteroid. It orbits the Sun once every 3.67 years.[2]
Discovered on March 2, 1981 by Schelte Bus at the Siding Spring Observatory, it was given the provisional designation "1981 EO18".[3]
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