2357 Phereclos
2357 Phereclos /ˈfɛrɪkləs/ is a large Jupiter trojan from the Trojan camp, approximately 95 kilometers (59 miles) in diameter. It was discovered on 1 January 1981, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, in the United States. The dark and possibly spherical D-type asteroid belongs to the 30 largest Jupiter trojans and has a rotation period of 14.4 hours. It was named after the shipbuilder Phereclos from Greek mythology.
| Discovery | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 1 January 1981 |
| Designations | |
MPC designation | (2357) Phereclos |
| Pronunciation | /ˈfɛrɪkləs/ |
Named after | Phereclos (Greek mythology) |
Alternative designations | 1981 AC · 1929 SM 1959 EU · 1965 UQ1 1972 JP1 · 1976 SC1 1977 RM7 · 1978 VN16 |
Minor planet category | Jupiter trojan Trojan · background |
| Adjectives | Phereclean |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.31 yr (32,257 d) |
| Aphelion | 5.4443 AU |
| Perihelion | 4.9756 AU |
Semi-major axis | 5.2099 AU |
| Eccentricity | 0.0450 |
Orbital period (sidereal) | 11.89 yr (4,344 d) |
Mean anomaly | 279.81° |
Mean motion | 0° 4m 58.44s / day |
| Inclination | 2.6689° |
Longitude of ascending node | 179.25° |
| 74.175° | |
| Jupiter MOID | 0.2303 AU |
| TJupiter | 2.9960 |
| Physical characteristics | |
Mean diameter | 94.62±1.26 km 94.90±4.3 km 98.45±1.92 km |
Synodic rotation period | 7.16±0.01 h 14.345±0.004 h 14.394±0.020 h 14.49±0.02 h |
| 0.049±0.002 0.052±0.007 0.0521±0.005 | |
| D (Tholen) D (Pan-STARRS) D (SDSS-MOC) U–B = 0.237 B–V = 0.890±0.050 V–R = 0.470±0.030 V–I = 0.960±0.012 | |
| 8.94 9.09±0.16 | |
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