1720 Niels
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1720 Niels, provisional designation Template:Mp, is a stony asteroid from the inner regions of the asteroid belt, approximately 6.4 kilometers in diameter. It was discovered on 7 February 1935, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after a grandson of the discoverer.[1][2]
Orbit and classification
Niels orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 3 months (1,182 days). Its orbit has an eccentricity of 0.10 and an inclination of 1° with respect to the ecliptic.[3] First observed at Heidelberg in 1927, NielsTemplate:' observation arc begins with its official discovery observation in 1935.[2]
Physical characteristics
Pan-STARRS classifies this stony asteroid as a LS-type, an intermediate to the rare L-type asteroids.[4]
Rotation period
A rotational lightcurve of Niels was obtained by astronomer Maurice Clark in December 2005. It gave it a rotation period of 9.976 hours with a brightness variation of 0.15 magnitude (U=1Script error: No such module "Check for unknown parameters".). In November 2008, photometric observations by amateur astronomer Pierre Antonini gave another period of 19.2 hours with an amplitude of 0.01 (U=1-Script error: No such module "Check for unknown parameters".). As of 2017, a secure period for Niels has not yet been obtained.
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Niels measures 6.394 kilometers in diameter, and its surface has an albedo of 0.227,[5] superseding a preliminary result that gave a slightly larger diameter and lower albedo.[6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on an absolute magnitude of 12.8.[7]
Naming
The minor planet was named by the discoverer after his grandson, Niels. Reinmuth also named 1719 Jens after one of his grandsons.[1] The official Template:MoMP was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933Script error: No such module "Check for unknown parameters".).[8]
References
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External links
- Asteroid Lightcurve Database (LCDB), query form (info Script error: No such module "webarchive".)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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