19741 Callahan
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19741 Callahan, provisional designation 2000 AN141, is a stony asteroid from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter. It was discovered on 5 January 2000, by the Lincoln Near-Earth Asteroid Research, LINEAR, at the Lincoln Laboratory's Experimental Test Site, Socorro, New Mexico.[3]
The S-type asteroid orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,230 days). Its orbit has an eccentricity of 0.13 and an inclination of 8° with respect to the ecliptic.[1] The first precovery was taken at ESO's La Silla Observatory in 1978, extending the asteroid's observation arc by 22 years prior to its discovery.[3]
In December 2009, a photometric light-curve analysis at the U.S. Palomar Transient Factory, California, rendered a rotation period of 7.2684±0.0015 hours with a relatively high brightness amplitude of 0.81 in magnitude (U=2), indicative of a non-spherical shape.[6] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.9 kilometers in diameter and its surface has an albedo of 0.22.[5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.1 kilometers, based on an absolute magnitude of 14.89.[4]
The minor planet was named after Diane Callahan, teacher at U.S. Fairfield Middle School, Ohio, who mentored a finalist in the 2003 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition.[2] Naming citation was published on 10 October 2003 (M.P.C. 49772).[7]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- 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
- 19741 Callahan at the JPL Small-Body Database
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