| Discovery[1] | |
|---|---|
| Discovered by | Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 15 December 1957 |
| Designations | |
| (1765) Wrubel | |
Named after | Marshal Henry Wrubel[2] (astronomy professor at IU) |
| 1957 XB · 1938 JB 1945 VA · 1949 HK1 1951 XB1 · 1955 KQ 1966 KA · A906 XA A917 XA | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.58 yr (36,371 days) |
| Aphelion | 3.7354AU |
| Perihelion | 2.6127 AU |
| 3.1741 AU | |
| Eccentricity | 0.1769 |
| 5.65yr (2,065 days) | |
| 314.43° | |
| 0° 10m 27.48s / day | |
| Inclination | 19.945° |
| 70.185° | |
| 265.28° | |
| Physical characteristics | |
| Dimensions | 37.704±0.731 km[4] 38.299±0.226 km[5] 42.20±0.48 km[6] 42.33 km(SIMPS)[3] |
| 5.260±0.002h[a] | |
| 0.1061(SIMPS)[3] 0.113±0.003[6] 0.130±0.029[5] 0.1360±0.0153[4] | |
| Tholen =DX[1][3] B–V = 0.750[1] U–B = 0.270[1] | |
| 9.92[1][3][4][6] · 10.06±0.12[7] | |
1765 Wrubel, provisional designation1957 XB, is a dark backgroundasteroid from the outer regions of theasteroid belt, approximately 40 kilometers in diameter. It was discovered on 15 December 1957, by astronomers of theIndiana Asteroid Program atGoethe Link Observatory in Indiana, United States.[8] The asteroid was named afterMarshal Henry Wrubel, professor atIndiana University.[2]
Wrubel is a background asteroid that does not belong to any knownasteroid family. It orbits the Sun in theouter main-belt at a distance of 2.6–3.7 AU once every 5 years and 8 months (2,065 days). Its orbit has aneccentricity of 0.18 and aninclination of 20° with respect to theecliptic.[1]
The asteroid was first identified asA906 XA atLowell Observatory in December 1906. The body'sobservation arc begins with its identification asA917 XA atHeidelberg Observatory in December 1917, almost 40 years prior to its official discovery observation at Goethe Link.[8]
Wrubel is a dark, carbonaceous asteroid. In theTholen classification, itsspectral type is ambiguous. Based on a numerical color analysis, it is closest to the darkD-type asteroid with some resemblance to theX-type asteroids (which encompass the primitiveP-types).[1]
In July 2012, a rotationallightcurve ofWrubel was obtained from photometric observations. Lightcurve analysis gave a well-definedrotation period of 5.260 hours with a brightness amplitude of 0.33magnitude (U=3).[a]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Wrubel measures between 37.704 and 42.20 kilometers in diameter and its surface has analbedo between 0.113 and 0.1360.[4][5][6]
TheCollaborative Asteroid Lightcurve Link adopt the results obtained by the Infrared Astronomical SatelliteIRAS, that is, an albedo of 0.1061 and a diameter of 42.33 kilometers with anabsolute magnitude of 9.92.[3]
Thisminor planet was named afterMarshal Henry Wrubel (1924–1968), professor of astronomy and faculty member atIndiana University, who was co-founder of theIndiana University Research Computing Center pioneering the use of high speed computers for astrophysical computations.[2]
The name was proposed byFrank K. Edmondson, who initiated theIndiana Asteroid Program.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1971 (M.P.C. 3143).[9]
