Английская Википедия:783 Nora
Шаблон:Use dmy dates Шаблон:Infobox planet
783 Nora (prov. designation: Шаблон:Mp or Шаблон:Mp) is a dark background asteroid from the inner regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 18 March 1914.[1] The carbonaceous C-type asteroid has a longer-than average rotation period of 55.5 hours and measures approximately Шаблон:Convert in diameter. It was likely named after Nora Helmer, principal character in the play A Doll's House by Norwegian poet Henrik Ibsen.[2]
Orbit and classification
Nora is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4][5] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,310 days; semi-major axis of 2.34 AU). Its orbit has an eccentricity of 0.23 and an inclination of 9° with respect to the ecliptic.[6] The body's observation arc begins with its first observation as Шаблон:Mp at Heidelberg Observatory on 28 August 1911, more than two years prior to its official discovery observation at Vienna Observatory.[1]
Naming
This minor planet was likely named after Nora Helmer, the heroine in the play A Doll's House (1879) by Norwegian poet Henrik Ibsen (1828–1906). The name was given by the discoverer's friends. The Шаблон:MoMP was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]
Physical characteristics
In the Bus–Binzel SMASS classification, Nora is a common, carbonaceous C-type asteroid.[6][4] In the Tholen classification it is one of few asteroids considered unclassifiable.
Rotation period
In March 2018, a rotational lightcurve of Nora was obtained from photometric observations by Tom Polakis at the Command Module Observatory Шаблон:Obscode in Arizona. Lightcurve analysis gave a rotation period of Шаблон:Val hours with a low brightness variation of Шаблон:Val magnitude (Шаблон:Small).[7] The result supersedes previous observations by European astronomers at the La Silla, Haute Provence and Hoher List observatories during the 1990s which gave two periods of Шаблон:Val and Шаблон:Val with an amplitude of Шаблон:Val and Шаблон:Val magnitude, respectively (Шаблон:Small).[8][9] In April 2007, French astronomer Arnaud Leroy determined a period of Шаблон:Val and a brightness variation of 0.01 magnitude (Шаблон:Small).[10]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Nora measures (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) kilometers in diameter and its surface has an albedo of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), respectively.[11][12][13] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0404 and a diameter of 39.84 kilometers based on an absolute magnitude of 11.1.[14] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][14] On 4 May 2004, an asteroid occultation of Nora gave a best-fit ellipse dimension of (Шаблон:Val), with a poor quality rating of 1. These timed observations are taken when the asteroid passes in front of a distant star.[4]
References
External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
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- Английская Википедия
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- Discoveries by Johann Palisa
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- Astronomical objects discovered in 1914
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