| Discovery[1] | |
|---|---|
| Discovered by | C. S. Shoemaker E. M. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 26 September 1987 |
| Designations | |
| (9564) Jeffwynn | |
Named after | Jeffrey Wynn (Americangeophysicist)[2] |
| 1987 SG3 · 1951 NQ | |
| Mars-crosser[1][3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.68 yr (23,988 days) |
| Aphelion | 3.0828AU |
| Perihelion | 1.5962 AU |
| 2.3395 AU | |
| Eccentricity | 0.3177 |
| 3.58yr (1,307 days) | |
| 159.61° | |
| 0° 16m 31.44s / day | |
| Inclination | 22.307° |
| 187.10° | |
| 121.61° | |
| Physical characteristics | |
| Dimensions | 4.71 km(calculated)[3] |
| 3.035±0.001h[4][a] | |
| 0.20(assumed)[3] | |
| S[3][5] | |
| 13.00[5] · 14.0[1][3] · 14.52±0.76[6] | |
9564 Jeffwynn, provisional designation1987 SG3, is an eccentricasteroid andMars-crosser from the inner regions of theasteroid belt, approximately 4.7 kilometers in diameter.
The asteroid was discovered on 26 September 1987, by American astronomer coupleCarolyn andEugene Shoemaker atPalomar Observatory in California, United States.[7] It was named for American geophysicistJeffrey C. Wynn.[2]
Jeffwynn is astony asteroid that orbits the Sun at a distance of 1.6–3.1 AU once every 3 years and 7 months (1,307 days). Its orbit has aneccentricity of 0.32 and aninclination of 22° with respect to theecliptic.[1]
The body'sobservation arc begins 36 years prior to its official discovery observation, with itsprecovery identification as1951 NQ at Palomar in July 1951.[7]
Jeffwynn has been characterized as a common, stonyS-type asteroid by photometry from theSloan Digital Sky Survey.[3][5]
In September 2012, a rotationallightcurve ofJeffwynn was obtained from photometric observations by American astronomerBrian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave a well-definedrotation period of3.035 hours with a brightness variation of 0.16magnitude (U=3).[4][a]
TheCollaborative Asteroid Lightcurve Link calculates a diameter of 4.7 kilometers with anabsolute magnitude of 14.0 and an assumedalbedo for stony asteroids of 0.20.[3]
Thisminor planet was named in honor of AmericanJeffrey C. Wynn, research geophysicist with theUnited States Geological Survey, described as a "humorous, curious, inventive, adventurous geophysicist", who examined the Saudi ArabianWabar craters on several expeditions in 1994 and 1995, together with Eugene Shoemaker, after whom the minor planet2074 Shoemaker is named. Wynn's research included mapping the seafloor, analyzing terrestrial minerals, and studyingaquifers and archaeological sites. He also observed with thecomet-discovering Shoemaker-Levy team.[2] The official naming citation was published by theMinor Planet Center on 23 November 1999 (M.P.C. 36948).[8]
