2173 Maresjev, provisional designation 1974 QG, is a dark background 1 asteroid from the outer regions of the asteroid belt, approximately 28 kilometers (17 miles) in diameter. It was discovered on 22 August 1974, by Soviet–Ukrainian astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named for Soviet war veteran  Alexey Maresyev. The assumed C-type asteroid has a tentative rotation period of 11.6 hours.
Orbit and classification Maresjev is a non- family asteroid from the main belt's background population. It orbits the Sun in the  outer asteroid belt at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,031 days; semi-major axis of 3.14 AU). Its orbit has an eccentricity of 0.11 and an inclination of 14 ° with respect to the ecliptic.
observation arc begins with its first observations as 1933 FN at Heidelberg Observatory in March 1933, or 41 years prior to its official discovery observation at Nauchnij.
Maresjev is an assumed carbonaceous C-type asteroid.
In September 2007, a fragmentary rotational
lightcurve of Maresjev was obtained from photometric observations by astronomers at the Oakley Observatory in the United States. Lightcurve analysis gave a rotation period of 11.6 hours with a brightness amplitude of 0.42 magnitude ( ). U=1 As of 2018, no secure period has been obtained. 
Diameter and albedo
According to the surveys carried out by the Japanese
Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Maresjev measures between 20.61 and 29.265 kilometers in diameter and its surface has an albedo between 0.0568 and 0.11.   
Collaborative Asteroid Lightcurve Link assumes an albedo of 0.0580 and calculates a diameter of 28.96 kilometers based on an absolute magnitude of 11.4.
minor planet was named after Alexey Maresyev (1916–2001), a Soviet war veteran and fighter ace. His story served as a basis for the novel Story about a True Man (also translated as Story of a Real Man) by Boris Polevoy, which became a popular Russian book that was eventually made into an opera. It was first published in English in 1952, and was reprinted in 1970. 
The official naming citation was published by the
Minor Planet Center on 1 April 1980 ( ). M.P.C. 5285
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"2173 Maresjev (1974 QG1)". Minor Planet Center . Retrieved . 19 March 2018
^ a b c d
"JPL Small-Body Database Browser: 2173 Maresjev (1974 QG1)" (2017-09-28 last obs.). Jet Propulsion Laboratory . Retrieved . 19 March 2018
^ a b c d e f g h i
"LCDB Data for (2173) Maresjev". Asteroid Lightcurve Database (LCDB) . Retrieved . 19 March 2018
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"Asteroid 2173 Maresjev – Proper Elements". AstDyS-2, Asteroids – Dynamic Site . Retrieved . 29 October 2019
^ a b c d
Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: . 1509.02522 Bibcode: 2015ApJ...814..117N. doi: 10.1088/0004-637X/814/2/117 . Retrieved . 19 March 2018
^ 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 . 19 March 2018 Online catalog
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Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv: . 1109.4096 Bibcode: 2011ApJ...741...68M. doi: 10.1088/0004-637X/741/2/68 . Retrieved . 19 March 2018
^ 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: . 1109.6407 Bibcode: 2011ApJ...741...90M. doi: 10.1088/0004-637X/741/2/90 . Retrieved . 19 March 2018
^ a b
Shipley, Heath; Dillard, Alex; Kendall, Jordan; Reichert, Matthew; Sauppe, Jason; Shaffer, Nelson; et al. (September 2008). "Asteroid Lightcurve Analysis at the Oakley Observatory - September 2007". The Minor Planet Bulletin. 35 (3): 99–102. Bibcode: 2008MPBu...35...99S. ISSN 1052-8091 . Retrieved . 19 March 2018
Kaganovsky, Lilya (2004). How the Soviet Man Was (Un)Made. Slavic Review. pp. 577–596.
"MPC/MPO/MPS Archive". Minor Planet Center . Retrieved . 19 March 2018