(9564) Jeffwynn Mars-crossing Asteroid
Discovered on 26 September 1987 by Shoemaker, C. S., Shoemaker, E. M. at Palomar.
Jeffrey C. Wynn, a humorous, curious, inventive, adventurous geophysicist with the U.S. Geological Survey has studied the Wabar Craters of Saudi Arabia with Gene Shoemaker, mapped the seafloor, analyzed mineral resources on land, studied aquifers and archaeological sites---and observed with the Shoemaker-Levy team.Naming citation (19991123/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Jeffwynn is today
Seen from above the solar system on 2026-10-14: Jeffwynn is 1.60 au from the Sun and 1.72 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9564 |
| Provisional designation | 1987 SG3 |
| Orbit class | Mars-crossing Asteroid |
| Rotation period | 3.04 hours |
| Absolute magnitude (H) | 13.99 |
| Orbital period | 3.58 years |
| Semi-major axis | 2.34 au |
| Perihelion – aphelion | 1.59 – 3.08 au |
| Eccentricity | 0.319 |
| Inclination | 22.3° |
| Closest distance between its orbit and Earth's (MOID) | 0.676 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jeffrey
- (7376) Jefftaylor
- (7657) Jefflarsen
- (9519) Jeffkeck
- (11691) Easterwood
- (14576) Jefholley
- (15088) Licitra
- (19598) Luttrell
- (21507) Bhasin
- (22564) Jeffreyxing
- (22991) Jeffreyklus
- (23038) Jeffbaughman
- (28813) Jeffreykurtz
All asteroids named after someone called Jeffrey
Also discovered on 26 September 1987
- (3736) Rokoske
- (3991) Basilevsky
- (6066) Hendricks
- (6183) Viscome
- (6635) Zuber
- (9739) Powell
- (13927) Grundy
More named asteroids discovered by Shoemaker, C. S., Shoemaker, E. M.
- (3025) Higson
- (3199) Nefertiti
- (3225) Hoag
- (3317) Paris
- (3554) Amun
- (3671) Dionysus
- (3700) Geowilliams
- (3854) George
- (3880) Kaiserman
- (3927) Feliciaplatt
- (3977) Maxine
- (4151) Alanhale
← (9563) Kitty · (9565) Tikhonov →