4217 Engelhardt
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4217 Engelhardt, provisional designation Template:Mp, is a stony Phocean asteroid and a potentially binary system from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 24 January 1988, by American astronomer Carolyn Shoemaker at Palomar Observatory in California, and later named after German mineralogist Wolf von Engelhardt.[1]
Classification and orbit
Engelhardt is a stony S-type asteroid and a member of the Phocaea family (701Script error: No such module "Check for unknown parameters".).[2] It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,286 days). Its orbit has an eccentricity of 0.21 and an inclination of 23° with respect to the ecliptic.[3]
It was first identified as Template:Mp at Turku Observatory in 1944, extending the body's observation arc by 44 years prior to its official discovery observation at Palomar.[1] It will pass about Script error: No such module "convert". from Earth threatening asteroid Template:Mpl in 2736.[4]
Physical characteristics
Lightcurves
In November 2004, a rotational lightcurve of Engelhardt was obtained from photometric observations by American astronomer Brian Warner at this Palmer Divide Observatory in Colorado.Template:Efn Lightcurve analysis gave a well-defined rotation period of 3.066 hours with a brightness amplitude of 0.16 magnitude (U=3Script error: No such module "Check for unknown parameters".).[5]
In December 2011, a follow-up observation by Warner gave a period of 3.0661 hours with 0.18 amplitude (U=3Script error: No such module "Check for unknown parameters".).[6] Due to a couple of supposed occultation and eclipsing events, Warner also suspects that Engelhardt might by a binary system with a minor-planet moon orbiting it every 36.03 hours. The result, however, is far from conclusive.Template:Efn
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Engelhardt measures between 7.34 and 9.16 kilometers in diameter and its surface has an albedo between and 0.231 and 0.37.[7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2489 and a diameter of 9.24 kilometers with on an absolute magnitude of 12.3.[8]
Naming
Baltic German geologist and mineralogist Wolf von Engelhardt (1910–2008), expert on impact craters and related mineral metamorphism. He was a professor at the University of Tübingen and a longtime director of its Institute of Mineralogy and Petrography.[9] The approved naming citation was published by the Minor Planet Center on 27 June 1991 (M.P.C. 18456Script error: No such module "Check for unknown parameters".).[10]
Notes
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 (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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