Английская Википедия:734 Benda
Шаблон:Use dmy dates Шаблон:Infobox planet
734 Benda (prov. designation: Шаблон:Mp or Шаблон:Mp) is a large background asteroid from the outer regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 11 October 1912.[1] For its size, the dark X-type asteroid has a relatively short rotation period of 7.1 hours. It was named after the discoverer's wife, Anna Benda.[2]
Orbit and classification
Benda 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 outer asteroid belt at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,040 days; semi-major axis of 3.15 AU). Its orbit has an eccentricity of 0.10 and an inclination of 6° with respect to the ecliptic.[6] The body's observation arc begins at the discovering Vienna Observatory on 23 February 1920, almost eight years after its official discovery observation.[1]
Naming
This minor planet was named by friends of the discoverer after Anna Benda, second wife of Johann Palisa, whom he married in 1902. However, the Шаблон:MoMP was erroneously attributed to the Czech composer Karel Bendl (1838–1897) in previous editions of the Dictionary of Minor Planet Names.[2]
Physical characteristics
Benda is an X-type asteroid in both the Tholen- and SMASS-like taxonomic variants of the Small Solar System Objects Spectroscopic Survey (S3OS2).[4][7] In agreement with its low albedo (see below), this object has also been classified as a C-type and P-type asteroid.[8]
Rotation period
In October 2013, a rotational lightcurve of Benda was obtained from photometric observations over two nights by Robert Stephens at the Center for Solar System Studies Шаблон:Obscode in California. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[9]Шаблон:Efn
In August 1995, a first period of Шаблон:Val hours was determined by Stefano Mottola (Шаблон:Small).[8] In March 2004, French amateur astronomer René Roy obtained a period of Шаблон:Val hours with an amplitude of Шаблон:Val magnitude from three nights of observations (Шаблон:Small),[10] while Robert K. Buchheim determined a period of Шаблон:Val hours and an amplitude of Шаблон:Val magnitude observing Benda over 10 nights at the Altimira Observatory Шаблон:Obscode in November 2007 (Шаблон:Small).[11] In September 2018, a collaboration of the Italian Amateur Astronomers Union reported a period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[12]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Benda 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.[13][14][15] The Collaborative Asteroid Lightcurve Link derives a low albedo of 0.0387 and a diameter of 70.71 kilometers based on an absolute magnitude of 9.9.[8]
Alternative mean-diameters published by the WISE team include (Шаблон:Val), (Шаблон:Val),[16] (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with a corresponding albedo of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][8] Two asteroid occultations on 4 April 2009 and on 3 September 2013, gave a best-fit ellipse dimension of (Шаблон:Val) and (Шаблон:Val), respectively, each with a low quality rating of 1.[4] These timed observations are taken when the asteroid passes in front of a distant star.[4]
Notes
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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