| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 6 September 1989 |
| Designations | |
| (7336) Saunders | |
Named after | R. Stephen Saunders (JPL scientist)[2] |
| 1989 RS1 | |
| NEO · Amor[1][3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.63 yr (12,647 days) |
| Aphelion | 3.4148AU |
| Perihelion | 1.1956 AU |
| 2.3052 AU | |
| Eccentricity | 0.4813 |
| 3.50yr (1,278 days) | |
| 353.72° | |
| 0° 16m 53.76s / day | |
| Inclination | 7.1958° |
| 174.49° | |
| 181.51° | |
| Earth MOID | 0.1908 AU · 74.3LD |
| Physical characteristics | |
| Dimensions | 0.467 km(derived)[4] |
| 6h[5] 6.423±0.004 h[a] | |
| 0.20(assumed)[4] | |
| SMASS =Sq[1] · S[4] | |
| 18.0[5] · 18.45±0.2(R)[a] · 18.8[1] · 19.02±0.112[4][6] | |
7336 Saunders, provisional designation1989 RS1, is a stonyasteroid andnear-Earth object of theAmor group, approximately 0.5 kilometers in diameter.
The asteroid was discovered on 6 September 1989, by American astronomerEleanor Helin atPalomar Observatory in California, United States.[3] It was named forJPL-project scientistR. Stephen Saunders.[2]
Saunders orbits the Sun at a distance of 1.2–3.4 AU once every 3 years and 6 months (1,278 days). Its orbit has aneccentricity of 0.48 and aninclination of 7° with respect to theecliptic.[1]
A firstprecovery was taken at the AustralianSiding Spring Observatory in 1982, extending the body'sobservation arc by 7 years prior to its official discovery at Palomar.[3] It has aminimum orbital intersection distance with Earth of 0.1908 AU (28,500,000 km), which corresponds to 74.3lunar distances.[4]
In theSMASS classification,Saunders is a Sq-type, which transitions from the commonS-type to theQ-type asteroids.[1] TheCollaborative Asteroid Lightcurve Link assumes a standardalbedo for stony asteroids of 0.20 and derives a diameter of 467 meters, based on an absolutemagnitude of 19.02.[4]
In October 1989, the first photometric observations ofSaunders were made with theESO 1-metre telescope atLa Silla in Chile.[5] It gave arotation period of 6 hours with a brightness variation of 0.3 magnitude (U=2). Another rotationallightcurve was obtained by Czech astronomerPetr Pravec atOndřejov Observatory in August 2003, giving a period of6.423±0.004 and an amplitude of 0.2 magnitude (U=n.a.).[a]
Thisminor planet was named in honor ofJPL-project scientist R. Stephen Saunders (born 1940), director of theRPIF and head scientist of theSolar System Exploration Office. He worked on theMars Surveyor 2001/03 program and on theMagellan spacecraft, that visited and mappedVenus in 1990.[2] The official naming citation was published by theMinor Planet Center on 26 July 2000 (M.P.C. 41028).[7]
