| Discovery [1] | |
|---|---|
| Discovered by | Y. Oshima |
| Discovery site | Gekko Observatory |
| Discovery date | 1 December 1989 |
| Designations | |
| (4383) Suruga | |
Named after | Suruga Province (Japanese province)[2] |
| 1989 XP · 1979 BE2 1981 UD10 · 1983 DN 1985 UL4 · 1985 VB4 | |
| main-belt · (inner) · Vestian [3] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.36 yr (14,012 days) |
| Aphelion | 2.5785AU |
| Perihelion | 2.2725 AU |
| 2.4255 AU | |
| Eccentricity | 0.0631 |
| 3.78yr (1,380 days) | |
| 150.70° | |
| 0° 15m 39.24s / day0 | |
| Inclination | 7.1538° |
| 88.532° | |
| 317.89° | |
| Knownsatellites | 1 [4][5] |
| Physical characteristics | |
| Dimensions | 6.471±0.088 km[6][7] 7.13 km(calculated)[3] |
| 3.811±0.005h(dated)[8] 3.4069±0.0004 h[5] | |
| 0.20(assumed)[3] 0.320±0.038[6][7] | |
| V [9] · S [3] | |
| 12.8[6] · 12.86±0.29[9] · 13.1[1][3] | |
4383 Suruga, provisional designation1989 XP, is a Vestianasteroid andbinary system from the inner regions of theasteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 1 December 1989, by Japanese astronomerYoshiaki Oshima atGekko Observatory, Japan.[10] The asteroid was named after the former JapaneseSuruga Province. Its synchronousminor-planet moon,S/2013 (4383) 1, measures approximately 1.33 kilometers and has aperiod of 16.386 hours.
Suruga is an orbital member of theVesta family in theinner main-belt.[3] It orbits the Sun at a distance of 2.3–2.6 AU once every 3 years and 9 months (1,380 days). Its orbit has aneccentricity of 0.06 and aninclination of 7° with respect to theecliptic.[1]
The asteroid was first identified as1979 BE2 atCrimea–Nauchnij in 1979. Itsobservation arc begins in 1981, when it was identified as1981 UD10 at the AustralianSiding Spring Observatory, extending the body'sobservation arc by 8 years prior to its official discovery observation.[10]
Suruga has been characterized as a brightV-type asteroid byPanSTARRS' photometric survey.[8][9]
In February 2013, a rotationallightcurve ofSuruga was obtained from photometric observations by American astronomerBrian Warner at his Palmer Divide Observatory (714) in Colorado. Lightcurve analysis gave a well-definedrotation period of 3.4069 hours with a brightness variation of 0.14magnitude (U=3), which indicates a nearly spheroidal shape.[5]
These observations supersede a period of 3.4069 hours (Δmag 0.08) of an ambiguous lightcurve, obtained by Japanese astronomers during lightcurve survey of V-type asteroids in December 2002 (U=1+).[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Suruga measures 6.471 kilometers in diameter and its surface has analbedo of 0.320,[6][7] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo forstony asteroids of 0.20 and calculates a diameter of 7.13 kilometers with anabsolute magnitude of 13.1.[3]
During Brian Warner's photometric observations in 2013, it was revealed, thatSuruga is a synchronousbinary system with aminor-planet moon in orbit.[5] The satellite has anorbital period of 16.386. Based on the brightness variations of the mutual eclipsing/occultation events, Warner estimates that the satellite's mean-diameter is at least 21% of that ofSuruga's (Ds/Dp of >0.21±0.02).[5] The Johnston's Archive derives a satellite diameter of 1.33 kilometer and estimates asemi-major axis of 11 kilometers for the moon's orbit.[4]
Thisminor planet was named after the formerSuruga Province, what is now theShizuoka Prefecture in central Japan. It is the place where the discoveringGekko Observatory is located(also see4261 Gekko).[2] The approved naming citation was published by theMinor Planet Center on 28 May 1991 (M.P.C. 18307).[11]
