679 Pax
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A three-dimensional model of 679 Pax based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | August Kopff |
| Discovery site | Heidelberg |
| Discovery date | January 28, 1909 |
| Designations | |
| 1909 FY | |
| Orbital characteristics[1] | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Aphelion | 3.394 AU |
| Perihelion | 1.782 AU |
| 2.588 AU | |
| Eccentricity | 0.311 |
| 4.164 a | |
| 165.779° | |
| Inclination | 24.353° |
| 112.485° | |
| 266.453° | |
| Physical characteristics | |
| Dimensions | 64.88 ± 3.64[2] km |
| Mass | (7.14 ± 1.99) × 1017[2] kg |
Mean density | 4.99 ± 1.62[2] g/cm3 |
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679 Pax is a minor planet orbiting the Sun that was discovered by German astronomer August Kopff on January 28, 1909. It is named after Pax, a Roman goddess.
Measurements using the adaptive optics at the W. M. Keck Observatory give a mean diameter of 62 km. This is 16% larger than the diameter estimated using the IRAS observatory. The asteroid is elongated with a size ratio of 1.66 ± 0.23 between the major and minor axes. Photometric measurements reported in 1982 gave a rotation period of 8.452 hours.[3]
Polarimetric study of this asteroid reveals anomalous properties that suggests the regolith consists of a mixture of low and high albedo material. This may have been caused by fragmentation of an asteroid substrate with the spectral properties of CO3/CV3 carbonaceous chondrites.[4]
References
- ↑ Yeomans, Donald K., "679 Pax", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ Marchis, F. et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813, retrieved 2013-03-27.
- ↑ Gil-Hutton, R. et al. (April 2008), "New cases of unusual polarimetric behavior in asteroids", Astronomy and Astrophysics 482 (1): 309–314, Bibcode:2008A&A...482..309G, doi:10.1051/0004-6361:20078965.
External links
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