(21073) Darksky Main-belt Asteroid
Discovered on 4 September 1991 by R. H. McNaught at Siding Spring.
Part of a worldwide initiative, Dark Sky Scotland promotes the use of Scotland's dark rural areas for astronomy outreach. Its events encourage the public to enjoy the night sky and learn how astronomers are exploring the wonders of the Universe.Naming citation (20091004/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Darksky is today
Seen from above the solar system on 2026-10-14: Darksky is 3.13 au from the Sun and 4.02 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21073 |
| Provisional designation | 1991 RE |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.0 |
| Orbital period | 4.15 years |
| Semi-major axis | 2.58 au |
| Perihelion – aphelion | 2.00 – 3.16 au |
| Eccentricity | 0.226 |
| Inclination | 2.92° |
| Closest distance between its orbit and Earth's (MOID) | 0.997 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 4 September 1991
- (6789) Milkey
- (7420) Buffon
- (8370) Vanlindt
- (8515) Corvan
- (9346) Fernandel
- (9594) Garstang
- (10784) Noailles
- (10785) Dejaiffe
- (11059) Nulliusinverba
- (12301) Eotvos
- (13533) Junili
- (13534) Alain-Fournier