2126 Gerasimovich

2126 Gerasimovich, provisional designation 1970 QZ, is a stony background asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 30 August 1970, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[11] The asteroid was named after Russian astronomer Boris Gerasimovich.[2]

2126 Gerasimovich
Discovery [1]
Discovered byT. Smirnova
Discovery siteCrimean Astrophysical Obs.
Discovery date30 August 1970
Designations
(2126) Gerasimovich
Named after
Boris Gerasimovich [2]
(Russian astronomer)
1970 QZ · 1931 AQ
1972 EH · 1976 GP8
main-belt · (inner) [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.48 yr (31,586 days)
Aphelion2.6779 AU
Perihelion2.1015 AU
2.3897 AU
Eccentricity0.1206
3.69 yr (1,349 days)
229.48°
0° 16m 0.48s / day
Inclination8.4757°
327.62°
70.181°
Physical characteristics
Dimensions7.11±1.52 km[5]
7.805±0.205 km[6][7]
8.57 km (calculated)[3]
9.36±0.68 km[8]
9.46±2.73 km[9]
22.951±0.005 h[10]
0.12±0.11[9]
0.20 (assumed)[3]
0.221±0.034[8]
0.25±0.17[5]
0.3179±0.0514[6][7]
S (assumed)[3]
12.40[7][8] · 12.60[5] · 12.7[3] · 12.8[1] · 13.03[9]

    Orbit and classification

    Gerasimovich is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.7 AU once every 3 years and 8 months (1,349 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.12 and an inclination of 8° with respect to the ecliptic.[1]

    The body's observation arc begins with its first identification as 1931 AQ at Lowell Observatory in January 1931, almost 40 years prior to its official discovery observation at Nauchnyj.[11]

    Physical characteristics

    Gerasimovich is an assumed, stony S-type asteroid.[3]

    Rotation period

    In October 2007, a rotational lightcurve of Gerasimovich was obtained from photometric observations by Maurice Clark at Montgomery College Observatory. Lightcurve analysis gave a rotation period of 22.951 hours with a brightness amplitude of 0.12 magnitude (U=2).[10]

    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, Gerasimovich measures between 7.11 and 9.46 kilometers in diameter and its surface has an albedo between 0.12 and 0.318.[5][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.57 kilometers based on an absolute magnitude of 12.7.[3]

    Naming

    This minor planet was named after Russian astronomer Boris Gerasimovich (1889–1937), professor at the National University of Kharkiv and director of the Pulkovo Observatory near Saint Petersburg, Russia. He is also honored by a lunar crater Gerasimovich.[2] The official naming citation was published by the Minor Planet Center on 1 June 1980 (M.P.C. 5359).[12]

    References
    1. "JPL Small-Body Database Browser: 2126 Gerasimovich (1970 QZ)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 December 2017.
    2. Schmadel, Lutz D. (2007). "(2126) Gerasimovich". Dictionary of Minor Planet Names – (2126) Gerasimovich. Springer Berlin Heidelberg. p. 172. doi:10.1007/978-3-540-29925-7_2127. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2126) Gerasimovich". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2017.
    4. "Asteroid 2126 Gerasimovich – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    5. 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 6 December 2017.
    6. 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 6 December 2017.
    7. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    8. 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)
    9. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 6 December 2017.
    10. Clark, Maurice (October 2008). "Asteroid Lightcurve Observations". The Minor Planet Bulletin. 35 (4): 152–154. Bibcode:2008MPBu...35..152C. ISSN 1052-8091. Retrieved 6 December 2017.
    11. "2126 Gerasimovich (1970 QZ)". Minor Planet Center. Retrieved 6 December 2017.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 December 2017.

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