(12949) Milogrootjen Outer Main-belt Asteroid
Discovered on 26 March 1971 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Milo Grootjen (b. 1975) is a Dutch astronomer and astronomy communicator. Since 2019, he has been head of the Artis Planetarium in Amsterdam, part of the capital’s zoo.Naming citation (WGSBN Bull. 5, #17, 16), IAU / Minor Planet Center, via NASA/JPL
Where Milogrootjen is today
Seen from above the solar system on 2026-10-14: Milogrootjen is 3.15 au from the Sun and 4.10 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12949 |
| Provisional designation | 4290 T-1 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 18.0 km (#2,498 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0950 |
| Absolute magnitude (H) | 12.71 |
| Orbital period | 6.11 years |
| Semi-major axis | 3.34 au |
| Perihelion – aphelion | 2.83 – 3.86 au |
| Eccentricity | 0.154 |
| Inclination | 12.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.83 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 26 March 1971
- (5195) Kaendler
- (5491) Kaulbach
- (5492) Thoma
- (5698) Nolde
- (6202) Georgemiley
- (6257) Thorvaldsen
- (6351) Neumann
- (6429) Brancusi
- (6674) Cezanne
- (6752) Ashley
- (7367) Giotto
- (7908) Zwingli