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Discovery
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| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | July 31, 1872 |
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Designations
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| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 501.593 Gm (3.353 AU) |
| Perihelion | 462.356 Gm (3.091 AU) |
| Semi-major axis | 481.975 Gm (3.222 AU) |
| Eccentricity | 0.041 |
| Orbital period | 2112.255 d (5.78 a) |
| Average orbital speed | 16.59 km/s |
| Mean anomaly | 283.072° |
| Inclination | 1.639° |
| Longitude of ascending node | 178.433° |
| Argument of perihelion | 325.878° |
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Physical characteristics
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| Dimensions | 81.7 km |
| Mass | 5.7×1017 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0228 m/s² |
| Escape velocity | 0.0432 km/s |
| Rotation period | 10.687 ± 0.001 hours[1] |
| Albedo | ? |
| Temperature | ~155 K |
| Spectral type | S |
| Absolute magnitude (H) | 7.87 |
122 Gerda is a fairly large outer main-belt asteroid. It is an S-type. It was discovered by C. H. F. Peters on July 31, 1872, and named after Gerðr, the wife of the god Freyr in Norse mythology.
In 2007 lightcurve data showed that Gerda rotates every 10.687 ± 0.001 hours.[1]
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