4022 Nonna

Nonna is a member of the Vesta family ({{small|401}}). Vestian asteroids have a composition akin to cumulate eucrites (HED meteorites) and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. Vesta is the main belt's second-largest and second-most-massive body after Ceres.

It orbits the Sun in the inner main-belt at a distance of 2.1–2.7 AU once every 3 years and 7 months (1,323 days; semi-major axis of 2.36 AU). Its orbit has an eccentricity of 0.13 and an inclination of 5° with respect to the ecliptic. The asteroid was first observed at Goethe Link Observatory in October 1952. The body's observation arc begins with its observation as {{mp|1966 PC}} at Crimea-Nauchnij in August 1966, more than 15 years prior to its official discovery observation.

Nonna has been characterized as a Q- and V-type asteroid by Pan-STARRS{{'}} photometric survey, while the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a common S-type asteroid. The overall spectral type of Vestian asteroids is typically that of a V-type.{{rp|23}}

Since 2006, several rotational lightcurves of Nonna have been obtained from photometric observations at Modra Observatory by astronomers Adrián Galád and Petr Pravec.{{efn|name=LCDB-Pravec-2010}}{{efn|name=LCDB-Pravec-2016}}{{efn|name=lightcurve-plot-Pravec-2017}} Analysis of the best-rated lightcurve from September 2006 gave a rotation period of 2.5877 hours with a brightness variation of 0.077 magnitude ({{small|U=3}}).{{efn|name=lightcurve-plot-Galad-2006}} A measurement by French amateur astronomer René Roy gave a similar result of 2.62 hours, after using an alternative period solution.{{efn|name=lcdb-amended-Behrend}} All lightcurves showed an unusually low amplitude which is indicative for a spheroidal shape. The asteroid's short period is close to that of a fast rotator.

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Nonna measures 3.67 kilometers in diameter and its surface has an exceptionally high albedo of 0.907. Conversely, CALL assumes a standard stony albedo of 0.20 and calculates a much larger diameter of 7.13 kilometers based on an absolute magnitude of 13.1.

This minor planet was named after Soviet cinema actress Nonna Mordyukova (1925–2008), a celebrated People's Artist of the USSR. The official naming citation was published by the Minor Planet Center on 25 August 1991 ({{small|M.P.C. 18645}}).

{{notelist|refs=

{{efn|name=LCDB-Pravec-2010|1=Pravec (2010) web: [http://www.asu.cas.cz/~asteroid/04022_b0.png lightcurve plot of (4022) Nonna] with a rotation period {{val|2.5868|0.0002}} hours and a brightness amplitude of {{val|0.10|0.01}} mag from March 2010. Quality Code is 3. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4022%7CNonna LCDB] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2010)] with [http://www.asu.cas.cz/~ppravec/newres.txt data sheet]}}

{{efn|name=LCDB-Pravec-2016|1=Pravec (2016) web: [http://www.asu.cas.cz/~asteroid/04022_b6.png lightcurve plot of (4022) Nonna] with a rotation period {{val|2.5873|0.0003}} hours and a brightness amplitude of {{val|0.09|0.01}} mag from April 2016. Quality Code is 3. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4022%7CNonna LCDB] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2016)] with [http://www.asu.cas.cz/~ppravec/newres.txt data sheet]}}

{{efn|name=lightcurve-plot-Galad-2006|1= Galad/Pravec (2006) [http://www.asu.cas.cz/~asteroid/4022.png lightcurve plot of (4022) Nonna] with a rotation period of 2.578 hours and an amplitude of 0.077 mag, from September 2006.

[http://www.asu.cas.cz/~ppravec/newres.htm Ondrejov data] obtained by the NEO Photometric Program and collaborating projects with [http://www.asu.cas.cz/~ppravec/newres.txt data sheet]}}

{{efn|name=lightcurve-plot-Pravec-2017|1= Pravec (2017) [http://www.asu.cas.cz/~asteroid/04022_b7.png lightcurve plot of (4022) Nonna] with a rotation period of {{val|2.5873|0.0001}} hours and an amplitude of 0.088 mag, from October 2017.

[http://www.asu.cas.cz/~ppravec/newres.htm Ondrejov data] obtained by the NEO Photometric Program and collaborating projects with [http://www.asu.cas.cz/~ppravec/newres.txt data sheet]}}

{{efn|name=lcdb-amended-Behrend|1=Period by René Roy from August 2003, corrected by the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4022%7CNonna LCDB]. Original period reported: 1.31 hours; amended to 2.62 hours. LCDB-comment: "this seems unlikely and so the double period was entered for the details record." Quality code of 2-.}}

}}

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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|4022}}
• {{JPL small body}}

{{Minor planets navigator |4021 Dancey |number=4022 |4023 Jarník}}

{{Small Solar System bodies}}

{{Authority control}}

{{DEFAULTSORT:Nonna}}

004022

Category:Discoveries by Lyudmila Chernykh

Category:Named minor planets

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