 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 29 October 1888 |
| Designations | |
| (280) Philia | |
| Pronunciation | /ˈfɪliə/ |
Named after | Philia (nymph) |
| A888 UB | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 126.17 yr (46,083 d) |
| Aphelion | 3.26133 AU (487.888 Gm) |
| Perihelion | 2.62787 AU (393.124 Gm) |
| 2.94460 AU (440.506 Gm) | |
| Eccentricity | 0.10756 |
| 5.05 yr (1,845.6 d) | |
| 52.7987° | |
| 0° 11m 42.212s / day | |
| Inclination | 7.44582° |
| 9.91179° | |
| 90.0510° | |
| Physical characteristics | |
| Dimensions | 45.69±2.0 km |
| 70.26 h (2.928 d) | |
| 0.0444±0.004 | |
| 10.9 | |
280 Philia is a fairly large Main belt asteroid.[2] It was discovered by Johann Palisa on 29 October 1888 at the Vienna Observatory.
Sparse data collected during a 1987 study indicated this asteroid has a rotation period of approximately 64 hours, which is much longer than can be continually observed from one site. During 2010−2011, an international collaboration to study the asteroid collected 9,037 photometric data points over 38 sessions. The resulting light curve analysis displays a rotation period of 70.26±0.03 h with a brightness variation of 0.15±0.02 in magnitude.[3]