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Discovery and designation
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| Discovered by | N. Kawasato | |||||||||
| Discovery date | September 27, 1997 | |||||||||
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Designations
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| Alternate name(s) | 1985 DY2, 1990 EN8, 1992 TP | |||||||||
| Epoch October 27, 2007 | ||||||||||
| Ap | 2.8938139 AU | |||||||||
| Peri | 2.8159419 AU | |||||||||
| Semi-major axis | 2.8548779 AU | |||||||||
| Eccentricity | 0.0136384 | |||||||||
| Orbital period | 1761.8938480 d | |||||||||
| Mean anomaly | 276.99091° | |||||||||
| Inclination | 1.81932° | |||||||||
| Longitude of ascending node | 187.61467° | |||||||||
| Argument of peri | 306.04538° | |||||||||
| Surface temp. Kelvin Celsius |
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| Absolute magnitude (H) | 13.2 | |||||||||
(9989) 1997 SG16 is a main belt asteroid. It orbits the Sun once every 4.82 years.[1]
Discovered by Nobuhiro Kawasato on September 27, 1997, it was given the provisional designation 1997 SG16.[2]
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