1266 Tone
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1266 Tone Template:IPAc-en is a dark background asteroid from the outer regions of the asteroid belt, approximately 80 kilometers in diameter. Discovered by astronomer Okuro Oikawa at the Tokyo Observatory in 1927,[1] it was assigned the provisional designation Template:Mp. The asteroid was later named after the Tone River, one of Japan's largest rivers.[2]
Discovery
It was discovered by Japanese astronomer Okuro Oikawa at the Tokyo Observatory (389Script error: No such module "Check for unknown parameters".) on 23 January 1927.[1] On the following night, it was independently discovered by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[2] The Minor Planet Center only recognizes the first discoverer.[1] In August 1899, the asteroid was first identified as Template:Mp at the Boyden Station of the Harvard Observatory in Arequipa, Peru.[1]
Orbit and classification
Tone is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the outer asteroid belt at a distance of 3.2–3.5 AU once every 6 years and 2 months (2,250 days; semi-major axis of 3.36 AU). Its orbit has an eccentricity of 0.05 and an inclination of 17° with respect to the ecliptic.[4]
The body's observation arc begins with its identification as Template:Mp at the German Heidelberg Observatory in January 1933, or four years after its official discovery observation at Tokyo.[1]
Physical characteristics
In the Tholen classification, Tone is a primitive and dark P-type asteroid.[4][5]
Rotation period
In October 1999, two rotational lightcurves of Tone were obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716Script error: No such module "Check for unknown parameters".) in Colorado. Lightcurve analysis gave two divergent rotation periods of 7.40 and 11.82 hours with a brightness variation of 0.06 and 0.12 magnitude, respectively (U=2/2Script error: No such module "Check for unknown parameters".).[6][7]Template:Efn Observation by Italian astronomers Roberto Crippa and Federico Manzini in October 2005, gave another tentative period of 12.9 hours and an amplitude of 0.07 magnitude (U=2-Script error: No such module "Check for unknown parameters".).[8] The LCDB currently adopts a period of 7.40 hours.[5]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Tone measures between 70.70 and 94.10 kilometers in diameter and its surface has an albedo between 0.039 and 0.0566.[9][10][11][12][13][14]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0566 and a diameter of 73.34 kilometers based on an absolute magnitude of 9.41.[5]
Naming
This minor planet was named after Tone River (Tone-gawa), Japan's second-largest river after the Shinano River.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116Script error: No such module "Check for unknown parameters".).
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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