1245 Calvinia

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1245 Calvinia (prov. designation: Template:Mp) is a stony Koronian asteroid from the outer regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 26 May 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[1] The S-type asteroid is likely elongated and has a rotation period of 4.9 hours.[2] It was named for the city of Calvinia in South Africa.[3]

Orbit and classification

According to Zappalà, Mothé-Diniz, as well as Milani and Knežević, Calvinia is a member of the Koronis family (605Script error: No such module "Check for unknown parameters".),[4][5] a very large outer asteroid family with nearly co-planar ecliptical orbits.[6] Interestingly, in one of the most recent and complete synthetic HCM-analysis by Nesvorný, Calvinia is not a Koronian asteroid but belongs to the background population.[4]

It orbits the Sun in the outer main-belt at a distance of 2.7–3.1 AU once every 4 years and 11 months (1,796 days; semi-major axis of 2.89 AU). Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic.[7] The asteroid was first observed as Template:Mp at the Heidelberg Observatory in March 1906. The body's observation arc begins with its official discovery observation at Johannesburg in May 1932.[1]

Naming

This minor planet was named after the regional city Calvinia in the Cape Province of South Africa.[3] The official Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115Script error: No such module "Check for unknown parameters".).[3]

Physical characteristics

In the Tholen classification, Calvinia is a common stony S-type asteroid,[4] which is also the overall spectral type for members of the Koronis family.[6]Template:Rp In the Barucci taxonomy (1987), it is an S0-type asteroid.[4]

Rotation period

In October 2017, a rotational lightcurve of Calvinia was obtained from photometric observations by Romain Montaigut, Christophe Gillier and Arnaud Leroy. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness variation of 0.28 magnitude (U=3Script error: No such module "Check for unknown parameters".).[8]

Other rotational were obtained by (ordered by increasing period determinations ) Brines (4.73 h; Δ0.35 mag; U=3-) in 2016,[9] by Lagerkvist (4.8 h; Δ0.52 mag; U=2) and (4.85 h; Δ0.7 mag; U=2) in 1975 and 1978,[10][11] respectively, by Erikson (4.84 h; U=3) in 1990,[12] by Slivan (4.8512 h; Δ0.37 mag; U=3) in 2002, by Roy (4.85129 h; Δ0.50 mag; U=3-),[8] and by Tedesco (4.855 h; Δ0.63 mag; U=3) in 1979.[2]

A modeled lightcurve using photometric data from the Lowell Photometric Database was published in 2016. It gave a concurring period of Script error: No such module "val". hours, as well as two spin axes at (52.0°, −51.0°) and (235.0°, −43.0°) in ecliptic coordinates (λ, β).[13]

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, Calvinia measures between 26.84 and 30.95 kilometers in diameter and its surface has an albedo between 0.214 and 0.2713.[14][15][16][17][18] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2689 and a diameter of 26.83 kilometers based on an absolute magnitude of 9.9.[2]

References

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  6. ↑ a b Script error: No such module "citation/CS1".
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  14. ↑ Script error: No such module "Citation/CS1".
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  17. ↑ Script error: No such module "Citation/CS1". (catalog)
  18. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
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External links

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