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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | April 6, 1891 |
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Designations
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| Named after | fraternity |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 444.129 Gm (2.969 AU) |
| Perihelion | 353.145 Gm (2.361 AU) |
| Semi-major axis | 398.637 Gm (2.665 AU) |
| Eccentricity | 0.114 |
| Orbital period | 1588.796 d (4.35 a) |
| Average orbital speed | 18.25 km/s |
| Mean anomaly | 317.538° |
| Inclination | 3.722° |
| Longitude of ascending node | 356.63° |
| Argument of perihelion | 311.56° |
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Physical characteristics
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| Dimensions | 45.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | unknown |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 10.4 |
309 Fraternitas is a typical Main belt asteroid.
It was discovered by Johann Palisa on April 6, 1891 in Vienna.
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