25 Phocaea
Phocaea /foʊˈsiːə/ (minor planet designation: 25 Phocaea) is a stony asteroid from the inner regions of the asteroid belt, approximately 75 kilometers in diameter. It is the parent body of the Phocaea family. Discovered by Jean Chacornac in 1853, it was named after the ancient Greek city of Phocaea.
Lightcurve-base 3D-model of Phocaea | |
| Discovery | |
|---|---|
| Discovered by | J. Chacornac |
| Discovery site | Marseille Obs. |
| Discovery date | 6 April 1853 |
| Designations | |
MPC designation | (25) Phocaea |
| Pronunciation | /foʊˈsiːə/ |
Named after | Phōcæa (ancient Greek city) |
Alternative designations | 1956 GC |
Minor planet category | main-belt · (inner) Phocaea |
| Adjectives | Phocaean /foʊˈsiːən/ |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 157.44 yr (57,504 days) |
| Aphelion | 3.0104 AU |
| Perihelion | 1.7899 AU |
Semi-major axis | 2.4001 AU |
| Eccentricity | 0.2543 |
Orbital period (sidereal) | 3.72 yr (1,358 days) |
Mean anomaly | 13.891° |
Mean motion | 0° 15m 54.36s / day |
| Inclination | 21.606° |
Longitude of ascending node | 214.14° |
| 90.245° | |
| Physical characteristics | |
| Dimensions | 61.05±2.46 km 61.054±2.463 km 71 km 75.13±3.6 km 80.19±4.66 km 82±8 km 83.21±0.96 km |
| Mass | (5.99 ± 0.60) × 1017 kg |
Mean density | 2.21±0.44 g/cm3 |
Synodic rotation period | 9.92±0.05 h 9.9341±0.0002 h 9.935±0.003 h 9.945±0.002 h 9.945 h 9.95±0.01 h |
| 0.189±0.005 0.2310±0.024 0.350±0.046 | |
| Tholen = S SMASS = S · S B–V = 0.932 U–B = 0.513 | |
| 7.83 · 7.90±0.25 | |
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