2121 Sevastopol
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 2121 Sevastopol
| background = #D6D6D6
| discovered = 27 June 1971
| discoverer = T. Smirnova
| discovery_site = {{nowrap|Crimean Astrophysical Obs.}}
| mpc_name = (2121) Sevastopol
| pronounced = {{IPAc-en|s|@|'|v|ae|s|t|@|p|ou|l}}{{MW|Sevastopol}}
| alt_names = 1971 ME{{·}}1932 HM
1936 WD{{·}}1938 DY
1939 TO{{·}}1952 SZ
{{mp|1968 QJ|1}}{{·}}{{mp|1977 ED|2}}
1978 WG
| named_after = Sevastopol {{small|city}}
| mp_category = main-belt{{·}}Flora
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 79.82 yr (29,154 days)
| aphelion = 2.5731 AU
| perihelion = 1.7945 AU
| semimajor = 2.1838 AU
| eccentricity = 0.1783
| period = 3.23 yr (1,179 days)
| mean_anomaly = 94.889°
| mean_motion = {{Deg2DMS|0.3054|sup=ms}} / day
| inclination = 4.3780°
| asc_node = 145.72°
| arg_peri = 160.38°
| dimensions = {{val|8.736|0.037}} km
12.48 km {{small|(calculated)}}
| rotation = 2.90640 h
| albedo = 0.24 {{small|(assumed)}}
{{val|0.308|0.023}}
| spectral_type = S
| abs_magnitude = 12.2
}}
{{Infobox planet
|name = Satellite
|discoverer = D. Higgins, P. Pravec, P. Kusnirak, J. Pollock, J. Oey, M. Husarik, G. Cervak, D. E. Reichart, K. M. Ivarsen, J. B. Haislip, and A. LaCluyze
|discovered = 2010/07/23
|discovery_method = Light curve
|semimajor = 26 km
|eccentricity =
|period = 1.546 d
13 hours, 6 minutes
|angular_dist = 46 mas (maximum)
|satellite_of = 2121 Sevastopol
|volume = 20.0-26.7 km3 (assumed)
|dimensions = 3.54 ± 0.17 km
|magnitude = 1.9 ± 0.1 fainter than primary
|abs_magnitude = ~16.1
}}
2121 Sevastopol, provisional designation {{mp|1971 ME}}, is a stony Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 27 June 1971, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. Its minor-planet moon was discovered in 2010.
Orbit and characterization
Sevastopol is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,179 days). Its orbit has an eccentricity of 0.18 and an inclination of 4° with respect to the ecliptic.
= Satellite =
In 2010, a minor-planet moon was discovered around Sevastopol, orbiting at a distance of 26 kilometers with a diameter of 3.54 ± 0.17 km.
Naming
The asteroid was named after the Crimean city on the 200th anniversary of its foundation. The approved naming citation was published by the Minor Planet Center on 28 January 1983 ({{small|M.P.C. 7616}}).
References
{{reflist|30em|refs=
|type = 2016-09-12 last obs.
|title = JPL Small-Body Database Browser: 2121 Sevastopol (1971 ME)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002121
|publisher = Jet Propulsion Laboratory
|accessdate = 19 June 2017}}
|title = Dictionary of Minor Planet Names – (2121) Sevastopol
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 172
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_2122 |chapter = (2121) Sevastopol }}
|title = 2121 Sevastopol (1971 ME)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2121
|accessdate = 19 June 2017}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 19 June 2017}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = T. |last2 = Grav
|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
|first5 = J. M. |last5 = Bauer
|first6 = R. |last6 = Stevenson
|first7 = S. |last7 = Sonnett
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M
|journal = The Astrophysical Journal
|volume = 791
|issue = 2
|page = 11
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645
|s2cid = 119293330 |access-date= 19 June 2017}}
|last1 = Johnston |first1 = Robert
|title = (2121) Sevastopol
|url = http://www.johnstonsarchive.net/astro/astmoons/am-02121.html
|website = johnstonsarchive.net
|access-date= 19 June 2017}}
|title = LCDB Data for (2121) Sevastopol
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2121%7CSevastopol
|accessdate = 19 June 2017}}
}}
{{Minor planets navigator |2120 Tyumenia |number=2121 |2122 Pyatiletka}}
{{Small Solar System bodies}}
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{{DEFAULTSORT:Sevastopol}}