(10403) Marcelgrun Main-belt Asteroid
Discovered on 22 November 1997 by Ticha, J., Tichy, M. at Klet.
The Czech astronomer Marcel Grün (b. 1946) is director of the Prague Planetarium. His main field of interest is education and popularization of astronautics, cosmonautics and space exploration.Naming citation (20000124/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Marcelgrun is today
Seen from above the solar system on 2026-10-14: Marcelgrun is 2.34 au from the Sun and 2.73 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10403 |
| Provisional designation | 1997 WU3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.63 km (#13,635 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.405 |
| Rotation period | 5.55 hours |
| Absolute magnitude (H) | 14.23 |
| Orbital period | 3.36 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 2.04 – 2.45 au |
| Eccentricity | 0.0922 |
| Inclination | 4.86° |
| Closest distance between its orbit and Earth's (MOID) | 1.05 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Marcel
- (10306) Pagnol
- (12275) Marcelgoffin
- (22281) Popescu
- (23946) Marcelleroux
- (26883) Marcelproust
- (30307) Marcelriesz
- (31378) Neidinger
- (37044) Papymarcel
- (85183) Marcelayme
- (99262) Bleustein
- (135978) Agueros
- (184878) Gotlib
All asteroids named after someone called Marcel