9991 Anežka
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9991 Anežka, provisional designation Template:Mp, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter.
The asteroid was discovered on 5 October 1997, by Czech astronomer Zdeněk Moravec at the South Bohemian Kleť Observatory in the Czech Republic.[1] It was named after the discoverer's grandmother, Anežka Moravcová.[2]
Orbit and classification
Anežka is a carbonaceous asteroid and member of the Themis family, a dynamical family of outer main-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.7 AU once every 5 years and 9 months (2,094 days). Its orbit has an eccentricity of 0.16 and an inclination of 2° with respect to the ecliptic.[3] It was first identified as Template:Mp at the Japanese Kiso Observatory in 1977, extending the body's observation arc by 20 years prior to its discovery.[1]
Physical characteristics
Rotation period
A rotational lightcurve for this asteroid was obtained from photometric observations at the Palomar Transient Factory in December 2012. It gave it a rotation period of Script error: No such module "val". hours with a brightness variation of 0.24 in magnitude (U=2Script error: No such module "Check for unknown parameters".).[4]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 12.3 kilometers in diameter and its surface has an albedo of 0.097,[5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 7.9 kilometers.[6]
Naming
This minor planet was named after the discoverer's grandmother, Anežka Moravcová (born 1924), on her 75th birthday.[2] The official naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34632Script error: No such module "Check for unknown parameters".).[7]
References
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External links
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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