(631) Philippines ( Latin Philippina ) - an asteroid of the main belt , which belongs to the spectral class S. It was discovered on June 23, 1907 by the German astronomer August Kopff at the Heidelberg Observatory and named after August Kopff 's friend Philippe Kessler [1] .
| (631) Philippines | |
|---|---|
| Opening | |
| Discoverer | Augustus Kopff |
| Detection point | Heidelberg |
| Date of discovery | March 21, 1907 |
| Eponym | Philip Kessler |
| Alternative designations | 1907 YJ ; 1951 UB1; A907 GL |
| Category | Main ring |
| Orbital characteristics | |
| The Age of June 23, 2010 JD 2455370.5 | |
| Eccentricity ( e ) | 0.0829559 |
| Semi-axis ( a ) | 417.94 million km (2,7937566 a. E.) |
| Perihelion ( q ) | 383.269 million km (2,561998 a. E.) |
| Afhelia ( Q ) | 452.611 million km (3.0255152 a. E.) |
| Period of circulation ( P ) | 1705,616 days (4.67 g ) |
| Average orbital speed | 17,789 km / s |
| Inclination ( i ) | 10.11292 ° |
| Ascending node longitude (Ω) | 285.30649 ° |
| Perihelion Argument (ω) | 289,73785 ° |
| Mean Anomaly ( M ) | 191,88820 ° |
| physical characteristics | |
| Diameter | 50,491 km |
| Rotation period | 5,891 h |
| Spectral class | S |
| Apparent magnitude | 14.58 m (current) |
| Absolute magnitude | 8.7 m |
| Albedo | 0,229 |
| Current distance from the Sun | 3,023 a. e. |
| Current distance from Earth | 3.201 a. e. |
Orbit of the asteroid of the Philippines and its position in the solar system
Photometric observations made in 1981 allowed us to obtain the light curves of this body, from which it followed that the period of rotation of the asteroid around its axis is 5.92 ± 0.01 hours, with a change in brightness as it rotates 0.20 m [2] . Observations in 2007 made it possible to refine this parameter to 5.899 ± 0.001 hours [3]
See also
- List of asteroids ( 601-700 )
- Small Planet Classifications
Notes
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003. - P. 63. - ISBN 3-540-00238-3 .
- Ho Schober, HJ (July 1983), The large C-type asteroids 146 Lucina and 410 Chloris, and the small S-type asteroids 152 Atala and 631 Philippina - Rotation periods and lightcurves , vol. 53, p. 71–75
- ↑ Buchheim, Robert K. - Lightcurves for 122 Gerda, 217 Eudora, 631 Phillipina, 670 Ottegebe, and 972 Cohnia (2007)