Английская Википедия:(9948) 1990 QB2
Шаблон:Short description Шаблон:Infobox planet
Шаблон:Mp, provisional designation Шаблон:Mp, is a stony Nysian asteroid from the inner region of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 22 August 1990, by American astronomer Henry Holt at the Palomar Observatory in California.[1] The likely elongated S-type asteroid has a rotation period of 3.53 hours.[2] This asteroid has not been named.[1]
Orbit and classification
Шаблон:Mp is member of the Nysa family (Шаблон:Small),[3] located in the Nysa–Polana complex. It is named after 44 Nysa and one of the largest families in the main belt.[4]Шаблон:Rp
The asteroid orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,344 days; semi-major axis of 2.38 AU). Its orbit has an eccentricity of 0.22 and an inclination of 2° with respect to the ecliptic.[5] The asteroid was first observed as Шаблон:Mp at Crimea–Nauchnij in September 1979. The body's observation arc begins at Palomar with its official discovery observation in 1990.[1]
Physical characteristics
Шаблон:Mp has been characterized as a common, stony S-type asteroid by Pan-STARRSШаблон:' survey and in the SDSS-based taxonomy.[2][6][7]
Rotation period
In November 2005, a first rotational lightcurve of Шаблон:Mp was obtained from photometric observations by Australian amateur astronomer David Higgins. Lightcurve analysis gave a well-defined rotation period of 3.5257 hours with a high brightness variation of 0.77 magnitude (Шаблон:Small).[8] In January 2014, observations in the R-band at the Palomar Transient Factory in California gave two concurring periods of 3.523 and 3.53 hours with an amplitude of 0.60 magnitude (Шаблон:Small).[9][10] A high brightness amplitude typically indicates that the body has a non-spherical shape
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Шаблон:Mp measures 3.345 kilometers in diameter and its surface has an albedo of 0.250.[11][12] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-result, that is, an albedo of 0.2232 and a diameter of 3.351 kilometers based on an absolute magnitude of 14.62.[2][13]
Naming
This minor planet was numbered on 2 February 1999 (Шаблон:Small).[14] As of 2018, it has not been named.[1]
References
External links
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Use dmy dates Шаблон:Minor planets navigator Шаблон:Small Solar System bodies
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