4138 Kalchas
4138 Kalchas /ˈkælkəs/ is a large Jupiter trojan from the Greek camp, approximately 53 kilometers (33 miles) in diameter. It was discovered on 19 September 1973, by Dutch astronomers Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Tom Gehrels at the Palomar Observatory in California. The assumed C-type asteroid is the principal body of the proposed Kalchas family and has a rotation period of 29.2 hours. It was named after the seer Calchas from Greek mythology.
| Discovery | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten-G. T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 19 September 1973 |
| Designations | |
MPC designation | (4138) Kalchas |
| Pronunciation | /ˈkælkəs/ |
Named after | Calchas (Greek mythology) |
Alternative designations | 1973 SM · 1986 VU6 |
Minor planet category | Jupiter trojan Greek · background |
| Adjectives | Kalchantian |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 61.48 yr (22,454 d) |
| Aphelion | 5.3874 AU |
| Perihelion | 4.9395 AU |
Semi-major axis | 5.1634 AU |
| Eccentricity | 0.0434 |
Orbital period (sidereal) | 11.73 yr (4,286 d) |
Mean anomaly | 283.43° |
Mean motion | 0° 5m 2.4s / day |
| Inclination | 2.0993° |
Longitude of ascending node | 208.02° |
| 164.17° | |
| Jupiter MOID | 0.019 AU |
| TJupiter | 2.9970 |
| Physical characteristics | |
Mean diameter | 46.46±0.67 km 61.04±3.49 km |
Synodic rotation period | 29.2±0.1 h |
| 0.057±0.007 0.082±0.006 | |
| C (assumed) V–I = 0.810±0.038 | |
| 9.80 10.0 10.1 | |
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