2325 Chernykh

2325 Chernykh, provisional designation 1979 SP, is a dark Themistian asteroid from the outer regions of the asteroid belt, approximately 23 kilometers (14 miles) in diameter. It was discovered on 25 September 1979, by Czech astronomer Antonín Mrkos at the Klet Observatory in the Czech Republic. The asteroid was named after Russian astronomer couple Lyudmila Chernykh and Nikolai Chernykh.[1]

2325 Chernykh
Discovery [1]
Discovered byA. Mrkos
Discovery siteKlet Obs.
Discovery date25 September 1979
Designations
(2325) Chernykh
Named after
Lyudmila Chernykh
Nikolai Chernykh
(Russian astronomers)[1]
1979 SP · 1957 UJ
1959 CH · 1971 FR
1974 WD1 · 1974 XN
1979 UG3
main-belt [1][2] · (outer)
Themis [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc62.03 yr (22,658 d)
Aphelion3.6909 AU
Perihelion2.5870 AU
3.1389 AU
Eccentricity0.1758
5.56 yr (2,031 d)
281.91°
0° 10m 37.92s / day
Inclination1.9199°
139.94°
267.37°
Physical characteristics
Mean diameter
22.789±0.194 km[4]
0.065±0.012[4]
11.9[2]

    Orbit and classification

    Chernykh is a Themistian asteroid that belongs to the Themis family (602),[3] a very large family of carbonaceous asteroids, named after 24 Themis.[5] It orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,031 days; semi-major axis of 3.14 AU). Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic.[2] The body's observation arc begins with its first precovery observation at Palomar Observatory in May 1955.[1]

    Physical characteristics

    Although the asteroid's spectral type is unknown, its albedo indicates a carbonaceous composition, which also agrees with C-type classification for the Themistian asteroids.[5]:23

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chernykh measures 22.789 kilometers in diameter and its surface has an albedo of 0.065.[4] As of 2018, no rotational lightcurve of Chernykh has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]

    Naming

    This minor planet was named after the Russian astronomers Lyudmila Chernykh (1935–2017) and Nikolai Chernykh (1931–2004), prolific discoverers of minor planets who lead the extensive astrometric program at the discovering Crimean Astrophysical Observatory.[1] The official naming citation was published by the Minor Planet Center on 1 June 1981 (M.P.C. 6060).[6]

    References
    1. "2325 Chernykh (1979 SP)". Minor Planet Center. Retrieved 26 March 2018.
    2. "JPL Small-Body Database Browser: 2325 Chernykh (1979 SP)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 26 March 2018.
    3. "Asteroid 2325 Chernykh – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    4. 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.
    5. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    6. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 March 2018.

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