(4638) Estens Main-belt Asteroid
Discovered on 2 March 1989 by R. H. McNaught at Siding Spring.
Where Estens is today
Seen from above the solar system on 2026-10-14: Estens is 2.38 au from the Sun and 1.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4638 |
| Provisional designation | 1989 EG |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.59 km (#11,443 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.210 |
| Rotation period | 3.03 hours |
| Absolute magnitude (H) | 13.8 |
| Orbital period | 3.25 years |
| Semi-major axis | 2.19 au |
| Perihelion – aphelion | 2.00 – 2.39 au |
| Eccentricity | 0.0898 |
| Inclination | 3.51° |
| Closest distance between its orbit and Earth's (MOID) | 1.00 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 2 March 1989
More named asteroids discovered by R. H. McNaught
- (3904) Honda
- (4093) Bennett
- (4128) UKSTU
- (4129) Richelen
- (4220) Flood
- (4456) Mawson
- (4499) Davidallen
- (4504) Jenkinson
- (4667) Robbiesh
- (4678) Ninian
- (4679) Sybil
- (4699) Sootan
← (4637) Odorico · (4639) Minox →