2312 Duboshin, provisional designation 1976 GU, is a dark Hildian 2 asteroid from the outermost regions of the asteroid belt, approximately 54 kilometers (34 miles) in diameter. It was discovered on 1 April 1976, by Soviet–Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named after Russian astronomer  Georgij Duboshin.  The  D-type asteroid has a longer than average rotation period of 50.78 hours.
Orbit and classification Duboshin is an asteroids of the dynamical Hilda group which stay in a 3:2 orbital resonance with Jupiter.  It is, however, not a member of the collisional  Hilda family but a non- family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.
It orbits the Sun in the
outermost asteroid belt at a distance of 3.3–4.6 AU once every 7 years and 11 months (2,880 days; semi-major axis of 3.96 AU). Its orbit has an eccentricity of 0.16 and an inclination of 5 ° with respect to the ecliptic. The asteroid was first observed as  1943 DH at Turku Observatory in February 1943, where the body's observation arc begins on the same day with a precovery.
Tholen classification, Duboshin is a dark D-type asteroid.  The  Wide-field Infrared Survey Explorer (WISE) also characterized it as a D-type.
In April 2016, a rotational
lightcurve of Duboshin was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies ( ) in California. Lightcurve analysis gave a long U81 rotation period of 50.78 hours with a brightness amplitude of 0.15 magnitude, indicative for a nearly spherical shape ( ). U=2+  While not being a [a] slow rotator, it has a notably longer period than that seen for most other asteroids, which rotate every 2 to 20 hours once around their axis.
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite
IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Duboshin measures between 50.122 and 58.53 kilometers in diameter and its surface has an albedo between 0.044 and 0.06.  
Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0496 and a diameter of 54.94 kilometers based on an absolute magnitude of 10.18.
minor planet was named after Russian astronomer Georgij Nikolaevich Duboshin (1904–1986), expert on celestial mechanics, author of several textbooks, and former president of IAU's Commission 7, Celestial Mechanics and Dynamical Astronomy in the early 1970s.  The official naming citation was published by the  Minor Planet Center on 1 December 1982 ( ). M.P.C. 7471
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Lightcurve plot of (2312) Duboshin, obtained by R. D. Stephens at Center for Solar System Studies (CS3) with 659 data points taken between 19 March and 16 April 2016. Rotation period hours with a brightness amplitude of 50.78 ±0.03 mag. Quality code of 2+. Summary figures at the 0.15 ±0.02 LCDB and CS3
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"2312 Duboshin (1976 GU2)". Minor Planet Center . Retrieved . 20 March 2018
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Schmadel, Lutz D. (2007). "(2312) Duboshin". Dictionary of Minor Planet Names – (2312) Duboshin. Springer Berlin Heidelberg. p. 188. doi: 10.1007/978-3-540-29925-7_2313. ISBN . 978-3-540-00238-3
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"JPL Small-Body Database Browser: 2312 Duboshin (1976 GU2)" (2017-07-04 last obs.). Jet Propulsion Laboratory . Retrieved . 20 March 2018
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"LCDB Data for (2312) Duboshin". Asteroid Lightcurve Database (LCDB) . Retrieved . 20 March 2018
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"Asteroid 2312 Duboshin – Proper Elements". AstDyS-2, Asteroids – Dynamic Site . Retrieved . 29 October 2019
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Grav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S.; et al. (January 2012). "WISE/NEOWISE Observations of the Hilda Population: Preliminary Results". The Astrophysical Journal. 744 (2): 15. arXiv: . 1110.0283 Bibcode: 2012ApJ...744..197G. doi: 10.1088/0004-637X/744/2/197.
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Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T . Retrieved . 22 October 2019
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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 . 17 October 2019 ( online, AcuA catalog p. 153)
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Stephens, Robert D. (October 2016). "Asteroids Observed from CS3: 2016 April - June". The Minor Planet Bulletin. 43 (4): 336–339. Bibcode: 2016MPBu...43..336S. ISSN 1052-8091 . Retrieved . 20 March 2018
Dahlgren, M.; Lahulla, J. F.; Lagerkvist, C.-I.; Lagerros, J.; Mottola, S.; Erikson, A.; et al. (June 1998). "A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids". Icarus. 133 (2): 247–285. Bibcode: 1998Icar..133..247D. doi: 10.1006/icar.1998.5919 . Retrieved . 20 March 2018
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"G. N. Duboshin – individual member". IAU – International Astronomical Union . Retrieved . 20 March 2018
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