1392 Pierre
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1392 Pierre, provisional designation Template:Mp, is a dark, dynamical Eunomian asteroid from the central regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 16 March 1936, by astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa.[1] The asteroid was named after the discoverer's nephew, Pierre.[2]
Orbit and classification
Pierre is a dynamical member of the Eunomia family (502Script error: No such module "Check for unknown parameters".), a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[3][4] PierreTemplate:'s spectral type is different from that of the Eunomia family (see below) and possibly an interloper rather than a true family member. When applying the hierarchical clustering method to its proper orbital elements, Pierre is a non-family asteroid of the main belt's background population.[5]
It orbits the Sun in the central main-belt at a distance of 2.1–3.1 AU once every 4 years and 3 months (1,538 days). Its orbit has an eccentricity of 0.20 and an inclination of 12° with respect to the ecliptic.[6] The asteroid was first observed as Template:Mp at Simeiz Observatory in October 1917. The body's observation arc begins with its official discovery observation at Algiers in March 1936.[1]
Naming
This minor planet was named after Pierre, a nephew of the discoverer Louis Boyer. The official Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 126Script error: No such module "Check for unknown parameters".).[2]
Physical characteristics
Pierre has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[7] In the Tholen classification, the asteroid's spectral type is ambiguous, closest to a dark D-type and somewhat similar to a generic X-type asteroid.[6] Conversely, the Eunomia family consists of S-type asteroids.[8]Template:Rp
Rotation period
In August 1984, a first rotational lightcurve of Pierre was obtained from photometric observations with the ESO 1-metre telescope at the La Silla Observatory in Chile. Lightcurve analysis gave a rotation period of 18 hours with a brightness variation of 0.09 magnitude (U=2Script error: No such module "Check for unknown parameters".).[9] A poorly rated lightcurve by Pierre Antonini in January 2007, gave a period of 24 hours with an amplitude of 0.05 magnitude.[10]
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, Pierre measures between 26.16 and 28.94 kilometers in diameter and its surface has an albedo between 0.04 and 0.054.[11][12][13][14] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0519 and a diameter of 26.44 kilometers based on an absolute magnitude of 11.72.[4][12]
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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