(6561) Gruppetta Main-belt Asteroid
Discovered on 10 October 1991 by K. J. Lawrence at Palomar.
John M. Gruppetta (b. 1957), a long-time friend of the discoverer, is a design engineer with an interest in astronomy.Naming citation (20000320/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Gruppetta is today
Seen from above the solar system on 2026-10-14: Gruppetta is 3.07 au from the Sun and 3.85 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6561 |
| Provisional designation | 1991 TC4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.18 km (#8,661 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.266 |
| Rotation period | 3.40 hours |
| Absolute magnitude (H) | 13.35 |
| Orbital period | 4.17 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.11 – 3.07 au |
| Eccentricity | 0.186 |
| Inclination | 13.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called John
- (3882) Johncox
- (3893) DeLaeter
- (4089) Galbraith
- (4147) Lennon
- (4525) Johnbauer
- (4656) Huchra
- (4987) Flamsteed
- (5207) Hearnshaw
- (5216) Cannizzo
- (5362) Johnyoung
- (5517) Johnerogers
- (5558) Johnnapier
All asteroids named after someone called John
Also discovered on 10 October 1991
More named asteroids discovered by K. J. Lawrence
← (6560) Pravdo · (6562) Takoyaki →