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Discovery[1]
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| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | 1922-08-27 |
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Designations
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| Alternate name(s) | 1922 MH |
| Minor planet category |
Main belt |
| Epoch 2455000.5 (2009-Jun-18.0) |
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| Aphelion | 3.3545319 AU |
| Perihelion | 2.2559173 AU |
| Semi-major axis | 2.8052246 AU |
| Eccentricity | 0.1958158 |
| Orbital period | 1716.1288367 day 4.70 year |
| Mean anomaly | 154.84845° |
| Inclination | 9.08580° |
| Longitude of ascending node | 314.32814° |
| Argument of perihelion | 55.88676° |
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Physical characteristics
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| Dimensions | 31.91 km[1] |
| Sidereal rotation period |
5.781 h[1] |
| Albedo | 0.4239[1] |
| Spectral type | Sr[1] |
| Absolute magnitude (H) | 9.03[1] |
984 Gretia is a main belt asteroid orbiting the Sun. It orbits about twice as far out as Mars and takes 4.7 years to orbit the Sun.[1]
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