{{Short description|Themistian asteroid}} {{Use dmy dates|date=March 2018}} {{Infobox planet | minorplanet = yes | name = 2325 Chernykh | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = A. Mrkos | discovery_site = Klet Obs. | discovered = 25 September 1979 | mpc_name = (2325) Chernykh | alt_names = 1979 SP{{·}}1957 UJ<br />1959 CH{{·}}1971 FR<br />{{mp|1974 WD|1}}{{·}}1974 XN<br />{{mp|1979 UG|3}} | pronounced = | named_after = Lyudmila Chernykh<br />Nikolai Chernykh<br />{{small|(Russian astronomers)}}<ref name="MPC-object" /> | mp_category = main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(outer)}}<br />Themis<ref name="Ferret" /> | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 62.03 yr (22,658 d) | aphelion = 3.6909 AU | perihelion = 2.5870 AU | semimajor = 3.1389 AU | eccentricity = 0.1758 | period = 5.56 yr (2,031 d) | mean_anomaly = 281.91° | mean_motion = {{Deg2DMS|0.1772|sup=ms}} / day | inclination = 1.9199° | asc_node = 139.94° | arg_peri = 267.37° | mean_diameter = {{val|22.789|0.194}} km<ref name="Masiero-2011" /> | rotation = | albedo = {{val|0.065|0.012}}<ref name="Masiero-2011" /> | spectral_type = | abs_magnitude = 11.9<ref name="jpldata" /> }}

thumb | right | alt=Orbit of asteroid 2325 | Orbit of asteroid 2325 '''2325 Chernykh''', provisional designation {{mp|1979 SP}}, is a dark Themistian asteroid from the outer regions of the asteroid belt, approximately {{convert|23|km|mi|abbr=off|sp=us}} 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.<ref name="MPC-object" />

== Orbit and classification ==

''Chernykh'' is a Themistian asteroid that belongs to the Themis family ({{small|602}}),<ref name="Ferret" /> a very large family of carbonaceous asteroids, named after 24 Themis.<ref name="Nesvorny-2014" /> It orbits the Sun in the outer main-belt at a distance of 2.6–3.7&nbsp;AU once every 5 years and 7 months (2,031 days; semi-major axis of 3.14&nbsp;AU). Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with its first precovery observation at Palomar Observatory in May 1955.<ref name="MPC-object" />

== 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.<ref name="Nesvorny-2014" />{{rp|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.<ref name="Masiero-2011" /> As of 2018, no rotational lightcurve of ''Chernykh'' has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.<ref name="jpldata" />

== 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.<ref name="MPC-object" /> The official naming citation was published by the Minor Planet Center on 1 June 1981 ({{small|M.P.C. 6060}}).<ref name="MPC-Circulars-Archive" />

== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2017-06-03 last obs. |title = JPL Small-Body Database Browser: 2325 Chernykh (1979 SP) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002325 |publisher = Jet Propulsion Laboratory |access-date = 26 March 2018}}</ref>

<ref name="MPC-object">{{cite web |title = 2325 Chernykh (1979 SP) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2325 |access-date = 26 March 2018}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |access-date = 26 March 2018}}</ref>

<ref name="Ferret">{{cite web |title = Asteroid 2325 Chernykh – Nesvorny HCM Asteroid Families V3.0 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2325+Chernykh#Asteroid%202325%20ChernykhEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 |access-date = 26 October 2019}}</ref>

<ref name="Nesvorny-2014">{{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |chapter = Identification and Dynamical Properties of Asteroid Families |title = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131 }}</ref>

<ref name="Masiero-2011">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T. IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 }}</ref>

}} <!-- end of reflist -->

== External links == * [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }}) * [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books * [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center * {{AstDys|2325}} * {{JPL small body}}

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{{DEFAULTSORT:Chernykh}} 002325 Category:Discoveries by Antonín Mrkos Category:Named minor planets 19790925