9971 Ishihara
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9971 Ishihara (prov. designation: Template:Mp) is a stony Flora asteroid from the inner regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory on 16 April 1993,[1] and named after Takahiro Ishihara, president of the astronomical society at Hiroshima.[2]
Orbit and classification
Ishihara is a member of the Flora family, one of the largest families of stony asteroids in the asteroid belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.4 AU once every 3 years and 3 months (1,177 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic.[3] It was first identified as Template:Mp at Karl Schwarzschild Observatory in 1991, extending the body's observation arc by approximately 2 years prior to its official discovery at Kitami.[1]
Naming
This minor planet was named after Takahiro Ishihara (born 1961), an observer of comets, communicator of astronomy, and former president of the astronomical society at Hiroshima (1987–1997).[2] The Template:MoMP was published by the Minor Planet Center on 6 January 2003 (M.P.C. 47298Script error: No such module "Check for unknown parameters".).[4]
Physical characteristics
Rotation and poles
In January 2012, a rotational lightcurve of Ishihara was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness amplitude of 1.06 in magnitude, which indicates that the body has a non-spheroidal shape (U=2Script error: No such module "Check for unknown parameters".).[5]
A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database (LPD), gave a concurring period of 6.71574 hours (U=n.a.Script error: No such module "Check for unknown parameters".), as well as a spin axis of (42.0°, 76.0°) in ecliptic coordinates (λ, β).[6]
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ishihara measures 4.986 and 5.012 kilometers in diameter and its surface has an albedo of 0.235 and 0.2328, respectively.[7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, a S-type asteroid and the family's largest member and namesake – and calculates a diameter of 3.74 kilometers with an absolute magnitude of 14.3.[9]
References
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External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, 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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