(12645) Jacobrosales Main-belt Asteroid
Discovered on 29 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Named for Jacob Rosales (b. 1967) of Jalisco, Mexico, and his son, Jacob (Coby) Rosales Chase (b. 1996) by Daniel W. E. Green, a close family friend. Jacob senior is an expert musician and teacher, specializing in violin and other stringed instruments; Coby is a student at Case Western Reserve University.Naming citation (MPC batch dated 2016-04-22), IAU / Minor Planet Center, via NASA/JPL
Where Jacobrosales is today
Seen from above the solar system on 2026-10-14: Jacobrosales is 2.68 au from the Sun and 3.64 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12645 |
| Provisional designation | 4240 T-2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.26 km (#16,678 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.416 |
| Absolute magnitude (H) | 15.25 |
| Orbital period | 3.68 years |
| Semi-major axis | 2.38 au |
| Perihelion – aphelion | 1.93 – 2.83 au |
| Eccentricity | 0.189 |
| Inclination | 3.48° |
| Closest distance between its orbit and Earth's (MOID) | 0.943 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jacob
- (9690) Houtgast
- (11772) Jacoblemaire
- (12180) Kistemaker
- (12208) Jacobenglander
- (15017) Cuppy
- (16120) Burnim
- (16165) Licht
- (19643) Jacobrucker
- (21926) Jacobperry
- (22730) Jacobhurwitz
- (23298) Loewenstein
- (23752) Jacobshapiro
All asteroids named after someone called Jacob
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