 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 29 October 1888 |
| Designations | |
| MPC designation | (280) Philia |
| Pronunciation | /ˈfɪliə/ |
| Named after | Philia (nymph) |
| Alternative designations | A888 UB |
| Minor planet category | Main belt |
| Orbital characteristics | |
| 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) |
| Semi-major axis | 2.94460 AU (440.506 Gm) |
| Eccentricity | 0.10756 |
| Orbital period (sidereal) | 5.05 yr (1,845.6 d) |
| Mean anomaly | 52.7987° |
| Mean motion | 0° 11 42.212 / day |
| Inclination | 7.44582° |
| Longitude of ascending node | 9.91179° |
| Argument of perihelion | 90.0510° |
| Physical characteristics | |
| Dimensions | 45.69±2.0 km |
| Synodic rotation period | 70.26 h (2.928 d) |
| Geometric albedo | 0.0444±0.004 |
| Absolute magnitude (H) | 10.9 |
280 Philia is a fairly large Main belt asteroid. 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.
References
- "280 Philia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
- Lewis, James R. (2003). The Encyclopedia of Heavenly Influences. p. 521. ISBN 9781578591442. Retrieved 6 April 2015.
- Pilcher, Frederick; et al. (July 2011), "Rotation Period Determination for 280 Philia - A Triumph of Global Collaboration", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, vol. 38, no. 3, pp. 127–128, Bibcode:2011MPBu...38..127P.
External links
- 280 Philia at AstDyS-2, Asteroids—Dynamic Site
- 280 Philia at the JPL Small-Body Database
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