1765 Wrubel

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1765 Wrubel
Discovery [1]
Discovered by Indiana University
(Indiana Asteroid Program)
Discovery site Goethe Link Obs.
Discovery date 15 December 1957
MPC designation (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 3.7354 AU
Perihelion 2.6127 AU
3.1741 AU
Eccentricity 0.1769
5.65 yr (2,065 days)
0° 10m 27.48s / day
Inclination 19.945°
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±0.002 h[a]
0.1061 (SIMPS)[3]
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 designation 1957 XB, is a dark background asteroid from the outer regions of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 15 December 1957, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States.[8] The asteroid was named after Marshal Henry Wrubel, professor at Indiana University.[2]

Orbit and classification[edit]

Wrubel is a background asteroid that does not belong to any known asteroid family. It orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 8 months (2,065 days). Its orbit has an eccentricity of 0.18 and an inclination of 20° with respect to the ecliptic.[1]

The asteroid was first identified as A906 XA at Lowell Observatory in December 1906. The body's observation arc begins with its identification as A917 XA at Heidelberg Observatory in December 1917, almost 40 years prior to its official discovery observation at Goethe Link.[8]

Physical characteristics[edit]

Wrubel is a dark, carbonaceous asteroid. In the Tholen classification, its spectral type is ambiguous. Based on a numerical color analysis, it is closest to the dark D-type asteroid with some resemblance to the X-type asteroids (which encompass the primitive P-types).[1]

Rotation period[edit]

In in July 2012, a rotational lightcurve of Wrubel was obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 5.260 hours with a brightness amplitude of 0.33 magnitude (U=3).[a]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Wrubel measures between 37.704 and 42.20 kilometers in diameter and its surface has an albedo between 0.113 and 0.1360.[4][5][6]

The Collaborative Asteroid Lightcurve Link adopt the results obtained by the Infrared Astronomical Satellite IRAS, that is, an albedo of 0.1061 and a diameter of 42.33 kilometers with an absolute magnitude of 9.92.[3]


This minor planet was named after Marshal Henry Wrubel (1924–1968), professor of astronomy and faculty member at Indiana University, who was co-founder of the Indiana University Research Computing Center pioneering the use of high speed computers for astrophysical computations.[2]

The name was proposed by Frank K. Edmondson, who initiated the Indiana Asteroid Program.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3143).[9]


  1. ^ a b Mazzone (2012) web. Observationy: 2012-07-16. Rotation period 5.260±0.002 hours with a brightness amplitude of 0.33±0.03 mag. Quality code of 3. Summary figures for (1765) Wrubel at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1765 Wrubel (1957 XB)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 September 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1765) Wrubel". Dictionary of Minor Planet Names – (1765) Wrubel. Springer Berlin Heidelberg. p. 141. doi:10.1007/978-3-540-29925-7_1766. ISBN 978-3-540-00238-3. Retrieved 6 September 2017. 
  3. ^ a b c d e f "LCDB Data for (1765) Wrubel". Asteroid Lightcurve Database (LCDB). Retrieved 6 September 2017. 
  4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 6 September 2017. 
  5. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 6 September 2017. 
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 6 September 2017. 
  7. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 6 September 2017. 
  8. ^ a b "1765 Wrubel (1957 XB)". Minor Planet Center. Retrieved 6 September 2017. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 September 2017. 

External links[edit]