751 Faïna

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751 Faïna (prov. designation: Template:Mp or Template:Mp) is a very large background asteroid from the central regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 28 April 1913, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[1] The elongated C-type asteroid (Ch) has a rotation period of 23.7 hours. It was named after Faina Mikhajlovna Neujmina, colleague and first wife of the discoverer.[2]

Orbit and classification

Located close to the region of the stony Eunomia family (502Script error: No such module "Check for unknown parameters".),[3] Faïna is a non-family asteroid of the main belt's background population when applying the modern synthetic hierarchical clustering method (HCM) by Nesvorný as well as Milani and Knežević (AstDys).[4][5] However, in the 1995 HCM-analysis by Zappalà,[6] Faïna is the parent body of the tiny Faïna family,[6] which is not recognized by modern analysis. The HCM-method is based on an object's proper orbital elements to group asteroids into families.

Faïna orbits the Sun in the central asteroid belt at a distance of 2.2–2.9 AU once every 4 years and 1 month (1,489 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.15 and an inclination of 16° with respect to the ecliptic.[7] The body's observation arc begins at Vienna Observatory on 8 May 2013, or two weeks after its official discovery observation by Grigory Neujmin at Simeiz.[1]

Naming

This minor planet was named after Faina Mikhajlovna Neujmina, the first wife of the discoverer. Astronomer Lutz Schmadel compiled this Template:MoMP, based on his private communication with "N. S. Samojlova-Yakhontova", as neither the Minor Planet Circulars nor The Names of the Minor Planets give any information about this asteroid's name.[2][8]

Physical characteristics

In the Tholen classification, Faïna is a common, carbonaceous C-type asteroid, while in the Bus–Binzel SMASS classification, it is a hydrated carbonaceous Ch-type.[7][5]

Rotation period

In late 1988, a rotational lightcurve of Faïna was obtained from photometric observations by Richard Miles at the Manley Observatory near Chester in northwest England. Lightcurve analysis gave a well-defined rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[9] Alternative observations by Roberto Crippa, Federico Manzini (2006) as well as by Bruno Christmann (2019) determined a period of Script error: No such module "val".+ and (Script error: No such module "val".) hours (or half the period) with an amplitude of Script error: No such module "val". and Script error: No such module "val". magnitude (U=1/2Script error: No such module "Check for unknown parameters".).[3][10]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Faïna 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 low albedo of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), respectively.[11][12][13][14]

The Collaborative Asteroid Lightcurve Link adopts the results from IRAS, that is, an albedo of 0.0497 and a diameter of 110.50 kilometers based on an absolute magnitude of 8.66.[3] The WISE team also published several alternative mean-diameters of (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), with a corresponding albedo of (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".), (Script error: No such module "val".), and (Script error: No such module "val".).[5][3]

On 28 March 2007, an asteroid occultation of Faïna gave a best-fit ellipse dimension of (Script error: No such module "val".) with a quality rating of 2, indicating its irregular, elongated shape. Another occultation on 21 October 2012, gave an ellipse of (Script error: No such module "val".). These timed observations are taken when the asteroid passes in front of a distant star.[5]

References

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  6. ↑ a b Script error: No such module "Citation/CS1".} (PDS main page)
  7. ↑ a b Script error: No such module "citation/CS1".
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  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
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External links

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