1397 Umtata

Umtata is a non-family asteroid of the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.0–3.4 AU once every 4 years and 5 months (1,603 days). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.

The asteroid was first identified as {{mp|1931 GK}} at the Lowell Observatory in April 1931. The body's observation arc begins with its official discovery observation at Johannesburg.

The asteroid's spectral type is unknown. The Lightcurve Data Base assumes an S- or C-type to be equally likely, using an average albedo of 0.10 (see below).{{efn|name=lcdb-S/C-type}}

In May 1984, a rotational lightcurve of Umtata was obtained from photometric observations by American astronomer Richard Binzel. Analysis of the fragmentary lightcurve gave a rotation period of 30 hours with a brightness amplitude of 0.13 magnitude ({{small|U=1}}). As of 2017, no secure period has been obtained.

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Umtata measures between 20.35 and 22.895 kilometers in diameter and its surface has an albedo between 0.0794 and 0.112.

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 – a compromise value between the stony (0.20) and carbonaceous asteroid's, both abundant in the main belt's central region – and derives a diameter of 20.40 kilometers based on an absolute magnitude of 11.57.

This minor planet was named after South-African town of Mthatha, formerly known as Umtata. It is the capital town of the OR Tambo District Municipality and the King Sabata Dalindyebo Local Municipality. The official {{MoMP|1397|naming citation}} was published by the Minor Planet Center in April 1953 ({{small|M.P.C. 909}}).

{{notelist|refs=

{{efn|name=lcdb-S/C-type|1=[http://www.minorplanet.info/datazips/LCDB_readme.txt Asteroid Lightcurve Data Base (LCDB) – 2. Taxonomic Class, orbital class, and albedo]. The LCDB generically assumes a S/C-type with an albedo of 0.10 for non-family main belt asteroids with a semi-major axis between 2.6 and 2.7.}}

}}

{{reflist|30em|refs=

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• [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|1397}}
• {{JPL small body}}

{{Minor planets navigator |1396 Outeniqua |number=1397 |1398 Donnera}}

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001397

Category:Discoveries by Cyril Jackson (astronomer)

Category:Named minor planets

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