(4678) Ninian Main-belt Asteroid
Discovered on 24 September 1990 by R. H. McNaught at Siding Spring.
Where Ninian is today
Seen from above the solar system on 2026-10-14: Ninian is 2.73 au from the Sun and 3.71 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4678 |
| Provisional designation | 1990 SS4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.00 km (#10,612 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.177 |
| Rotation period | 56.7 hours |
| Spectral type | S |
| Absolute magnitude (H) | 13.87 |
| Orbital period | 3.41 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 1.78 – 2.75 au |
| Eccentricity | 0.215 |
| Inclination | 3.74° |
| Closest distance between its orbit and Earth's (MOID) | 0.774 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 24 September 1990
More named asteroids discovered by R. H. McNaught
- (3904) Honda
- (4093) Bennett
- (4128) UKSTU
- (4129) Richelen
- (4220) Flood
- (4456) Mawson
- (4499) Davidallen
- (4504) Jenkinson
- (4638) Estens
- (4667) Robbiesh
- (4679) Sybil
- (4699) Sootan
← (4677) Hiroshi · (4679) Sybil →