(21776) Kryszczynska Main-belt Asteroid
Discovered on 5 September 1999 by LONEOS at Anderson Mesa.
Agnieszka Kryszczyńska (b. 1965) is a planetary scientist at Adam Mickiewicz University, Poznań. Using photometry, she has studied the physical properties of minor planets. She discovered the binary nature of (809) Lundia and maintains a database of the pole coordinates and shapes of minor planets.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Kryszczynska is today
Seen from above the solar system on 2026-10-14: Kryszczynska is 2.73 au from the Sun and 3.54 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21776 |
| Provisional designation | 1999 RE221 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.45 km (#14,093 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.195 |
| Absolute magnitude (H) | 15.04 |
| Orbital period | 4.25 years |
| Semi-major axis | 2.62 au |
| Perihelion – aphelion | 2.28 – 2.96 au |
| Eccentricity | 0.130 |
| Inclination | 5.48° |
| Closest distance between its orbit and Earth's (MOID) | 1.29 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
- (21775) Tsiganis
- (38423) Jeokjungchogye
- (42910) Samanthalawler
- (59804) Dickjoyce
- (59828) Ossikar