17246 Christophedumas
Template:Use dmy dates Template:Infobox planet
17246 Christophedumas (provisional designation Template:Mp) is a stony Koronian asteroid and binary system from the outer regions of the asteroid belt, approximately 4.6 kilometers in diameter.
It was discovered on 5 April 2000, by the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States.[1] It was named after planetary scientist Christophe Dumas. The asteroid's minor-planet moon was discovered in 2004.[2]
Orbit and classification
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Christophedumas is a member of the Koronis family, which is named after 158 Koronis. It orbits the Sun in the outer main-belt at a distance of 2.8–2.9 AU once every 4 years and 9 months (1,748 days). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic.[3] The asteroid's observation arc begins 29 years prior to its official discovery observation, with a precovery taken at Palomar Observatory in April 1971.[1]
Close approach with Juno
On 9 January 2129, Christophedumas will come within 3,639,998 kilometers of 3 Juno, one of the largest asteroids in the main-belt, and will pass it with a relative velocity of 6.597 km/s.[3]
Physical characteristics
Christophedumas is a presumed stony S-type asteroid. With an albedo of 0.21, it is more reflective than most asteroids in the outer main-belt.[2] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.21 and calculates a diameter of 4.81 kilometers based on an absolute magnitude of 13.9.[4]
In December 2007, a rotational lightcurve of Christophedumas was obtained from photometric observations by Israeli astronomer David Polishook and colleagues. Lightcurve analysis gave a rotation period of 10 hours with a brightness amplitude of 0.15 magnitude (Template:Small).[5] The team of astronomers also ruled out that Christophedumas might be an Escaping Ejecta Binary (EEB), that are thought to be created by fragments ejected from a disruptive impact event.[5]
Moon
In 2004, a minor-planet moon, designated Template:Mp, was discovered orbiting its primary, making Christophedumas a binary asteroid.[2]Template:Efn With a secondary-to-primary mean-diameter ratio of 0.22, the moon measures approximately 1 kilometer in diameter, based on a diameter of 4.5 kilometers for its primary.[6] While its rotation period and orbital eccentricity is not yet known, it is known that the moon completes one orbit every 90 days (2034 hours) with a semi-major axis of 228 kilometers.[7][6]
From the surface of Christophedumas, the moon would have an apparent diameter of about 0.668°, slightly larger than the Moon appears from Earth.Template:Efn Template:Clear
Naming
This minor planet was named after planetary scientist Christophe Dumas (born 1968), an observer of Solar System objects and expert in using adaptive optics. Dumas is a co-discoverer of the first asteroid moon imaged from Earth.[1] The approved naming citation was published by the Minor Planet Center on 20 June 2016 (Template:Small).[8][9]
Notes
References
External links
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- 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 (15001)-(20000) – Minor Planet Center
- Template:AstDys
- Template:JPL small body
Template:Minor planets navigator Template:Small Solar System bodies Template:Authority control
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