641 Agnes
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641 Agnes, provisional designation Template:Mp, is a stony Florian asteroid and slow rotator from the inner regions of the asteroid belt, approximately Script error: No such module "convert". in diameter.
It was discovered on 8 September 1907, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[1] The meaning of the asteroids's name is unknown.[2]
Classification and orbit
Agnes is a stony S-type asteroid and a member of the Flora family, one of the largest groups of stony asteroids in the asteroid belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,208 days). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic.[3] The body's observation arc begins with a recovered observation at Vienna Observatory, one month after its official discovery observation at Heidelberg.[1]
Physical characteristics
Rotation period
In March 1975, photometric observations by Swedish astronomer Claes-Ingvar Lagerkvist measured a period of 8.9 hours for Agnes. The lightcurve, however, was fragmentary and the result uncertain (U=1Script error: No such module "Check for unknown parameters".).[4][5]
In October 2013, the first reliable rotational lightcurve of Agnes was obtained by astronomers Frederick Pilcher, Lorenzo Franco and Luis Martinez at Organ Mesa Template:Obscode and Balzaretto Observatory Template:Obscode respectively. Lightcurve analysis gave a well-defined rotation period of 178.0 hours with a brightness variation of 0.55 magnitude (U=3Script error: No such module "Check for unknown parameters".). The team also assumed a standard albedo for stony S-type asteroids of 0.20, calculated an absolute magnitude of 12.64, estimated a mean diameter of Script error: No such module "val". kilometers, and measured a V–R color index of 0.50.[6]
With such a long rotation period, Agnes is a slow rotator, of which a few hundred minor planets are currently known.
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Agnes measures between Script error: No such module "convert". in diameter, and its surface has an albedo between 0.21 and 0.30.[7][8][9][10] The Collaborative Asteroid Lightcurve Link adopts the results obtained by Pilcher,[6] and calculates a diameter of 8.81 kilometers.[4]
Naming
Any reference of this minor planet's name to a person or occurrence is unknown.[2]
Unknown meaning
Among the many thousands of named minor planets, Agnes is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between Template:Mp and Template:Mp and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[11]
References
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External links
- Occultation of Star HIP 103032 by 641 AgnesScript error: No such module "Unsubst".
- 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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