| Discovery[1] | |
|---|---|
| Discovered by | K. Suzuki T. Urata |
| Discovery site | Toyota Obs. |
| Discovery date | 14 November 1990 |
| Designations | |
| (5592) Oshima | |
Named after | Yoshiaki Oshima[1] (Japanese astronomer) |
| 1990 VB4 · 1955 RA | |
| main-belt[1][2] · (outer) Veritas[3][4] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 62.13yr (22,693 d) |
| Aphelion | 3.3830AU |
| Perihelion | 2.9610 AU |
| 3.1720 AU | |
| Eccentricity | 0.0665 |
| 5.65 yr (2,063 d) | |
| 26.407° | |
| 0° 10m 28.2s / day | |
| Inclination | 8.4938° |
| 231.63° | |
| 99.822° | |
| Physical characteristics | |
| 22.657±0.211 km[5][6] 22.96±0.87 km[7] 24.6±0.2 km[8] 25.32 km(derived)[9] 25.43±2.5 km[10] 30.47±11.41 km[11] 38.39±4.47 km[3] | |
| 12.54±0.02 h[12] | |
| 0.0301±0.0059[3] 0.04±0.09[11] 0.0479(derived)[9] 0.06±0.01[8] 0.0666±0.0040[6] 0.0686±0.016[10] 0.076±0.003[5] 0.086±0.007[7] | |
| C (Pan-STARRS)[13] C(SDSS-MOC)[14] Caa(S3OS2-TH)[15] Ch(S3OS2-BB)[15] | |
| 11.50[7][10] 11.68±0.37[13] 11.7[6][8] 11.80[11] 11.9[2][9] | |
5592 Oshima, provisional designation1990 VB4, is a Veritasianasteroid from the outer regions of theasteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 14 November 1990, by astronomersKenzo Suzuki andTakeshi Urata at theToyota Observatory, and later named after Japanese astronomerYoshiaki Oshima.[1] The carbonaceousC-type asteroid has arotation period of 12.5 hours.[9]
Oshima is a core member of theVeritas family (609),[3][4] a youngfamily of carbonaceous asteroids, that formed approximately8.5±0.5 million years ago. The family is named after490 Veritas and consists of nearly 1,300 members.[16]: 8, 23 Other members of this family include1086 Nata and2934 Aristophanes.
This asteroid orbits the Sun in theouter main belt at a distance of 3.0–3.4 AU once every 5 years and 8 months (2,063 days;semi-major axis of 3.17 AU). Its orbit has aneccentricity of 0.07 and aninclination of 8° with respect to theecliptic.[citation needed] The body'sobservation arc begins with its first observation as1955 RA atGoethe Link Observatory in September 1955, more than 35 years prior to its official discovery observation at Toyota.[1]
Oshima has been characterized as a carbonaceousC-type asteroid byPan-STARRS and in theSDSS-based taxonomy.[3][9][14] TheSmall Solar System Objects Spectroscopic Survey (S3OS2) it is classified as a Caa and hydrated Ch-type in the survey's Tholen- and SMASS-like taxonomy, respectively.[3][15]
In September 2006, a rotationallightcurve ofOshima was obtained fromphotometric observations by French amateur astronomerLaurent Bernasconi. Lightcurve analysis gave arotation period of12.54±0.02 hours with a brightness amplitude of 0.28magnitude (U=2).[9][12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Oshima measures between 22.657 and 30.47 kilometers in diameter and its surface has analbedo between 0.04 and 0.086.[5][6][7][8][10][11]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0479 and a diameter of 25.32 kilometers based on anabsolute magnitude of 11.9.[9]
Thisminor planet was named by the second discoverer after Japanese astronomerYoshiaki Oshima, a prolificdiscoverer of minor planets himself at theGekko Observatory during the late 1990s. The official naming citation was published by theMinor Planet Center on 1 September 1993 (M.P.C. 22511).[17]
