1235 Schorria

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1235 Schorria
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 18 October 1931
MPC designation (1235) Schorria
Named after
Richard Schorr (astronomer)[2]
1931 UJ · 1988 HD
Mars-crosser[1] · Hungaria[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 85.23 yr (31,130 days)
Aphelion 2.2053 AU
Perihelion 1.6155 AU
1.9104 AU
Eccentricity 0.1544
2.64 yr (964 days)
0° 22m 23.88s / day
Inclination 25.003°
Earth MOID 0.6623 AU
Physical characteristics
Dimensions 5.04 km (calculated)[3]
9 km (estimate)[4]
11±4 (generic)[5]
3.3±0.02 h (incorrect)[6]
1265±25 h[4]
0.40 (assumed)[3]
B–V = 0.750[1]
U–B = 0.330[1]
Tholen = CX: [1] · CX: [3]
12.68[1] · 12.71±0.63[7] · 13.10±0.04[3][8][9]

1235 Schorria, provisional designation 1931 UJ, is a Hungaria asteroid, sizable Mars-crosser, and exceptionally slow rotator from the inner region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 18 October 1931, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany,[10] and named for astronomer Richard Schorr.[2]


In the Tholen taxonomy, Schorria is classified as a CX:-type, an intermediate between the C-type and X-type asteroids. It is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.6–2.2 AU once every 2 years and 8 months (964 days). Its orbit has an eccentricity of 0.15 and an inclination of 25° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg two weeks after its official discovery observation, as no precoveries were taken, and no prior identifications were made.[10]

In March 2009, a rotational light-curve of Schorria was obtained by American astronomers Brian Warner and Robert Stephens. Light curve analysis of the two astronomer's combined data set of almost 2000 photometric observations revealed that this Mars-crosser is one of the slowest rotating asteroids known to exist. It has a rotation period of 1265±80 hours, or about 52 days, with a high brightness variation of 1.40 in magnitude (U=3),[4] which is indicative of a non-spheroidal shape. The body was also suspected to be in a tumbling state. However, no significant evidence of such a non-principal axis rotation could be found.[4]

No estimates for Schorria's diameter and albedo have been published by any of the space-based surveys such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, or NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission.[3] Based on a generic magnitude-to-diameter conversion, Schorria measures between 7 and 15 kilometers, for an absolute magnitude at 13 and an albedo in the range of 0.05 to 0.25,[5] while Warner/Stephens estimated a diameter of approximately 9 kilometers in 2009.[4]:103 The Collaborative Asteroid Lightcurve Link calculates a diameter of 5.04 kilometers based on an albedo of 0.40, which is contrary to an expected low albedo for dark, carbonaceous CX-type asteroids as classified by Tholen,[3] but typical for the descendants of the E-belt, a hypothesized population of primordial asteroids, which the E-type Hungarian asteroids with high inclinations and a semi-major axis of 1.9 AU are thought to have originated from.[3]

This minor planet was named after Richard Schorr (1867–1951), astronomer at Bergedorf Observatory, Hamburg, who discovered the minor planets 869 Mellena and 1240 Centenaria. After being named by ARI with the consent of the discoverer (RI 862), naming citation was later published by Paul Herget in The Names of the Minor Planets in 1955 (H 114).[2] The lunar crater Schorr is also named in the astronomer's honour.[2]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1235 Schorria (1931 UJ)" (2017-01-09 last obs.). Jet Propulsion Laboratory. Retrieved 26 January 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1235) Schorria. Springer Berlin Heidelberg. p. 103. ISBN 978-3-540-00238-3. Retrieved 25 January 2017. 
  3. ^ a b c d e f g h "LCDB Data for (1235) Schorria". Asteroid Lightcurve Database (LCDB). Retrieved 25 January 2017. 
  4. ^ a b c d e Warner, Brian D.; Stephens, Robert D. (July 2009). "The Lightcurve for the Long-Period Hungaria Asteroid 1235 Schorria". The Minor Planet Bulletin. 36 (3): 102–103. Bibcode:2009MPBu...36..102W. ISSN 1052-8091. Retrieved 25 January 2017. 
  5. ^ a b "Absolute Magnitude (H)". NASA/JPL. Retrieved 26 January 2017. 
  6. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1235) Schorria". Geneva Observatory. Retrieved 25 January 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 January 2017. 
  8. ^ Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 25 January 2017. 
  9. ^ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 25 January 2017. 
  10. ^ a b "1235 Schorria (1931 UJ)". Minor Planet Center. Retrieved 25 January 2017. 

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