(4138) Kalchas Jupiter Trojan
Discovered on 19 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Where Kalchas is today
Seen from above the solar system on 2026-10-14: Kalchas is 5.40 au from the Sun and 6.40 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4138 |
| Provisional designation | 1973 SM |
| Orbit class | Jupiter Trojan |
| Diameter | 46.5 km (#822 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0820 |
| Rotation period | 29.2 hours |
| Absolute magnitude (H) | 10.13 |
| Orbital period | 11.8 years |
| Semi-major axis | 5.18 au |
| Perihelion – aphelion | 4.96 – 5.40 au |
| Eccentricity | 0.0432 |
| Inclination | 2.10° |
| Closest distance between its orbit and Earth's (MOID) | 3.95 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 19 September 1973
- (2643) Bernhard
- (3290) Azabu
- (3548) Eurybates
- (4007) Euryalos
- (4068) Menestheus
- (4230) van den Bergh
- (4387) Tanaka
- (4757) Liselotte
- (5041) Theotes
- (5928) Pindarus
- (7152) Euneus
- (7214) Anticlus