(21775) Tsiganis Main-belt Asteroid
Discovered on 5 September 1999 by LONEOS at Anderson Mesa.
Kleomenis Tsiganis (b. 1974), of the University of Thessaloniki, works on the chaotic diffusion of minor planets and the effect of the late heavy bombardment on the structure of the Trojan clouds and the main belt.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Tsiganis is today
Seen from above the solar system on 2026-10-14: Tsiganis is 2.27 au from the Sun and 1.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21775 |
| Provisional designation | 1999 RC221 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.15 km (#14,840 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0150 |
| Rotation period | 26.1 hours |
| Absolute magnitude (H) | 15.33 |
| Orbital period | 3.33 years |
| Semi-major axis | 2.23 au |
| Perihelion – aphelion | 1.92 – 2.54 au |
| Eccentricity | 0.138 |
| Inclination | 5.27° |
| Closest distance between its orbit and Earth's (MOID) | 0.908 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 5 September 1999
- (12576) Oresme
- (12579) Ceva
- (16064) Davidharvey
- (19691) Iwate
- (20606) Widemann
- (21665) Frege
- (21678) Lindner
- (21776) Kryszczynska
- (38423) Jeokjungchogye
- (42910) Samanthalawler
- (59804) Dickjoyce
- (59828) Ossikar