969 Leocadia
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969 Leocadia (prov. designation: Template:Mp or Template:Mp) is a very dark background asteroid from the inner regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 5 November 1921, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula.[1] The uncommon F-type asteroid (FX) has a rotation period of 6.9 hours and is likely regular in shape.[2] Any reference of the asteroid's name to a person is unknown.[3]
Orbit and classification
Leocadia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 10 months (1,411 days; semi-major axis of 2.46 AU). Its orbit has an eccentricity of 0.21 and an inclination of 2° with respect to the ecliptic.[6] The body's observation arc begins at Uccle Observatory in February 1933, more than a decade after its official discovery observation Simeiz Observatory on 5 November 1921.[1]
Naming
This minor planet is named after a Feminine Russian first name. Any reference of this name to a person or occurrence is unknown.[3]
Unknown meaning
Among the many thousands of named minor planets, Leocadia 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.[7]
Physical characteristics
In the Tholen classification (FXU:), Leocadia is an uncommon and dark F-type asteroid, somewhat similar to that of an X-type, though with an unusual (U) and noisy (:) spectra.[6]
Rotation period
In December 2006, a rotational lightcurve of Leocadia was obtained from photometric observations by Italian amateur astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station Template:Obscode. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness amplitude of Script error: No such module "val". magnitude (U=2Script error: No such module "Check for unknown parameters".), which is indicative of a rather spherical, non-irregular shape.[2][8]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Leocadia measures Script error: No such module "val"., Script error: No such module "val". and Script error: No such module "val". kilometers in diameter, and its surface has a very low albedo of Script error: No such module "val"., Script error: No such module "val". and Script error: No such module "val"., respectively.[9][10][11] Additional measurements by the WISE telescope were published giving a mean diameter as low as Script error: No such module "val"..[8] The Collaborative Asteroid Lightcurve Link adopts the result from IRAS, that is, an albedo of 0.0435 and a diameter of 19.51 kilometers based on an absolute magnitude of 9.22.[8]
An asteroid occultation on 19 August 2013, gave a best-fit ellipse dimension of 19.0 × 19.0 kilometers.[5] These timed observations are taken when the asteroid passes in front of a distant star. However the measurements for Leocadia were of poor quality.[5]
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 (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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