(20444) Mamesser Main-belt Asteroid
Discovered on 10 May 1999 by LINEAR at Socorro.
Mary Anne Messer (b. 1989) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her behavioral science project. She attends the Presbyterian Christian School, Hattiesburg, Mississippi.Naming citation (20041028/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Mamesser is today
Seen from above the solar system on 2026-10-14: Mamesser is 2.09 au from the Sun and 2.92 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20444 |
| Provisional designation | 1999 JK63 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.46 km (#16,328 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.319 |
| Absolute magnitude (H) | 15.08 |
| Orbital period | 3.43 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.89 – 2.66 au |
| Eccentricity | 0.169 |
| Inclination | 6.01° |
| Closest distance between its orbit and Earth's (MOID) | 0.880 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Mary
- (4793) Slessor
- (5595) Roth
- (6603) Marycragg
- (7091) Maryfields
- (7958) Leakey
- (9824) Marylea
- (10870) Gwendolen
- (11369) Brazelton
- (12590) Ballantine
- (12627) Maryedwards
- (12628) Acworthorr
- (13412) Guerrieri
All asteroids named after someone called Mary
Also discovered on 10 May 1999
- (11219) Benbohn
- (11225) Borden
- (11227) Ksenborisova
- (11228) Botnick
- (11229) Brookebowers
- (11230) Deschaffer
- (11231) Schiavo
- (11413) Catanach
- (11414) Allanchu
- (12117) Meagmessina
- (16048) Eddiedai
- (16049) D'Amore