Astronomy:280 Philia
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Short description: Main-belt asteroid
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 29 October 1888 |
| Designations | |
| (280) Philia | |
| Pronunciation | /ˈfɪliə/ |
| Named after | Philia (nymph) |
| A888 UB | |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 126.17 yr (46,083 d) |
| |{{{apsis}}}|helion}} | 3.26133 astronomical unit|AU (487.888 Gm) |
| |{{{apsis}}}|helion}} | 2.62787 AU (393.124 Gm) |
| 2.94460 AU (440.506 Gm) | |
| Eccentricity | 0.10756 |
| Orbital period | 5.05 yr (1,845.6 d) |
| Mean anomaly | 52.7987° |
| Mean motion | 0° 11m 42.212s / day |
| Inclination | 7.44582° |
| Longitude of ascending node | 9.91179° |
| 90.0510° | |
| Physical characteristics | |
| Dimensions | 45.69±2.0 km |
| Rotation period | 70.26 h (2.928 d) |
| Geometric albedo | 0.0444±0.004 |
| Absolute magnitude (H) | 10.9 |
Philia (minor planet designation: 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]
References
- ↑ "280 Philia". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=280.
- ↑ Lewis, James R. (2003). The Encyclopedia of Heavenly Influences. p. 521. ISBN 9781578591442. https://books.google.com/books?id=lmv4930JbY0C&q=280+Philia+asteroid&pg=PA521. 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 38 (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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