(11769) Alfredjoy Main-belt Asteroid
Discovered on 29 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Alfred H. Joy (1882-1973) was an astronomer at the Mount Wilson Observatory from 1915 to 1973 who measured spectroscopic parallaxes and radial velocities of stars and studied variable stars. He invented the T Tauri classification.Naming citation (20071124/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Alfredjoy is today
Seen from above the solar system on 2026-10-14: Alfredjoy is 2.50 au from the Sun and 3.31 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 11769 |
| Provisional designation | 2199 T-2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.80 km (#15,655 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.356 |
| Absolute magnitude (H) | 14.94 |
| Orbital period | 4.19 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 2.50 – 2.69 au |
| Eccentricity | 0.0365 |
| Inclination | 3.06° |
| Closest distance between its orbit and Earth's (MOID) | 1.49 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Alfred
- (7750) McEwen
- (8282) Delp
- (9683) Rambaldo
- (11422) Alilienthal
- (11519) Adler
- (11765) Alfredfowler
- (12057) Alfredsturm
- (13058) Alfredstevens
- (13672) Tarski
- (14331) Alyankovic
- (24907) Alfredhaar
- (29227) Wegener
All asteroids named after someone called Alfred
Also discovered on 29 September 1973
- (2049) Grietje
- (4357) Korinthos
- (4549) Burkhardt
- (4721) Atahualpa
- (4752) Myron
- (4876) Strabo
- (4978) Seitz
- (5151) Weerstra
- (5197) Rottmann
- (5243) Clasien
- (5244) Amphilochos
- (5266) Rauch