25 Phocaea
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| Discovery | |
|---|---|
| Discovered by | J. Chacornac |
| Discovery date | April 6, 1853 |
| Designations | |
| Pronunciation | /foʊˈsiːə/ foh-SEE-ə |
| Named after | Phōcæa |
| Alternative names | 1956 GC |
| Minor planet category | Main belt (Phocaea family) |
| Orbital characteristics | |
| Epoch June 14, 2006 (JD 2453900.5) | |
| Aphelion | 450.716 Gm (3.013 AU) |
| Perihelion | 267.314 Gm (1.787 AU) |
| Semi-major axis | 359.015 Gm (2.400 AU) |
| Eccentricity | 0.255 |
| Orbital period | 1357.936 d (3.72 a) |
| Average orbital speed | 18.91 km/s |
| Mean anomaly | 6.932° |
| Inclination | 21.584° |
| Longitude of ascending node | 214.258° |
| Argument of perihelion | 90.154° |
| Physical characteristics | |
| Dimensions |
75.1 ± 3.6 km (IRAS)[1] 80.19 ± 4.66[2] km |
| Mass | (5.99 ± 0.60) × 1017[2] kg |
| Mean density | 2.21 ± 0.44[2] g/cm3 |
| Equatorial surface gravity | 0.0210? m/s² |
| Escape velocity | 0.0397? km/s |
| Rotation period | 0.4144 d (9.945 h)[1][3] |
| Albedo | 0.231[1][4] |
| Temperature | ~173 K |
| Spectral type | S[1] |
| Absolute magnitude (H) | 7.83[1] |
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25 Phocaea is a main-belt asteroid. It was discovered by J. Chacornac at Marseille, on April 6. 1853. It was his first asteroid discovery out of a total of six. It is named after Phocaea, the Greek name of Foça in Turkey, from whence came the founders of Marseille.
Phocaea has been studied by radar.[5] Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a light curve with a period of 9.9341 ± 0.0002 hours. The brightness near the deepest minimum of the light curve showed changes with phase angle, which is the result of shadows extending across surface irregularities.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 25 Phocaea". Jet Propulsion Laboratory. 2011-12-30 last obs. Retrieved 2012-01-26.
- ↑ 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.
- ↑ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_DERIVED_LIGHTCURVE_V8_0/data/lc.tab
- ↑ http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2011-10-30.
- ↑ Pilcher, Frederick (April 2011), "Rotation Period Determinations for 25 Phocaea, 140 Siwa, 149 Medusa 186 Celuta, 475 Ocllo, 574 Reginhild, and 603 Timandra", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 38 (2): 76-78, Bibcode:2011MPBu...38...76P.
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