(21479) Marymartha Main-belt Asteroid
Discovered on 23 April 1998 by LINEAR at Socorro.
Mary Martha Ferrari Douglas (b. 1988) was awarded first place and Best in Category in the 2006 Intel International Science and Engineering Fair for her behavioral and social sciences team project. She received the EU Contest for Young Scientists Award. She attends the Manhasset High School, Manhasset, New York, U.S.A.Naming citation (20060711/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Marymartha is today
Seen from above the solar system on 2026-10-14: Marymartha is 2.38 au from the Sun and 3.34 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21479 |
| Provisional designation | 1998 HN124 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.66 km (#13,549 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.331 |
| Rotation period | 5.32 hours |
| Absolute magnitude (H) | 14.39 |
| Orbital period | 3.21 years |
| Semi-major axis | 2.18 au |
| Perihelion – aphelion | 1.74 – 2.61 au |
| Eccentricity | 0.200 |
| Inclination | 4.84° |
| Closest distance between its orbit and Earth's (MOID) | 0.725 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
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- (10870) Gwendolen
- (11369) Brazelton
- (12590) Ballantine
- (12627) Maryedwards
- (12628) Acworthorr
- (13412) Guerrieri
All asteroids named after someone called Mary
Also discovered on 23 April 1998
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