Fraternitas (minor planet designation: 309 Fraternitas) is a typical Main belt asteroid.[2] It was discovered by Johann Palisa on 6 April 1891 in Vienna.
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 6 April 1891 |
| Designations | |
MPC designation | (309) Fraternitas |
| Pronunciation | /frəˈtɜːrnɪtæs/ |
Named after | fraternity |
Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 125.03 yr (45667 d) |
| Aphelion | 2.97127 AU (444.496 Gm) |
| Perihelion | 2.35779 AU (352.720 Gm) |
Semi-major axis | 2.66453 AU (398.608 Gm) |
| Eccentricity | 0.11512 |
Orbital period (sidereal) | 4.35 yr (1588.7 d) |
Mean anomaly | 190.308° |
Mean motion | 0° 13m 35.785s / day |
| Inclination | 3.71999° |
Longitude of ascending node | 356.574° |
Argument of perihelion | 310.477° |
| Physical characteristics | |
| Dimensions | 45.32±3.3 km |
Synodic rotation period | 22.398 h (0.9333 d) |
Geometric albedo | 0.0595±0.010 |
Absolute magnitude (H) | 10.7 |
Analysis of the asymmetric bimodal light curve of the asteroid from photometric data collected during 2014 provide a rotation period of 22.398±0.001 h with a brightness variation of 0.12±0.01 in magnitude.[3]
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