786 Bredichina

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786 Bredichina (prov. designation: Template:Mp or Template:Mp) is a carbonaceous and very large background asteroid, approximately Script error: No such module "convert". in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory on 20 April 1914.[1] The elongated C-type asteroid has a longer than average rotation period of 29.4 hours. It was named after Russian astronomer Fyodor Bredikhin (1831–1904).[2]

Orbit and classification

Bredichina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4][5] It orbits the Sun in the outer main-belt at a distance of 2.7–3.7 AU once every 5 years and 8 months (2,068 days; semi-major axis of 3.18 AU). Its orbit has an eccentricity of 0.16 and an inclination of 15° with respect to the ecliptic.[6] The body's observation arc begins at Heidelberg Observatory on 21 April 1914, the night after its official discovery observation.[1]

Naming

This minor planet was named after Fyodor Bredikhin (1831–1904), also known as Theodor or Feodor Alexandrovich Bredichin, a Russian astronomer and director of the Pulkovo Observatory. He has made important contributions to the study of comets. The Template:MoMP was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 78Script error: No such module "Check for unknown parameters".).[2] The lunar crater Bredikhin is also named after him.[7]

Physical characteristics

In the Tholen classification, Bredichina is a common, carbonaceous C-type asteroid.[6] It is also a C-type and C0-type in the Tedesco and Barucci classification from the 1908s.[4]

Rotation period

In March 2015, a rotational lightcurve of Bredichina was obtained from photometric observations by Spanish astronomers Alfonso Carreño Template:Obscode, Amadeo Aznar Template:Obscode, Enrique Arce Template:Obscode, Pedro Brines Template:Obscode, and Juan Lozano Template:Obscode. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=3−Script error: No such module "Check for unknown parameters".).[8]

Previously, in August 2008, Argentine astronomer Ricardo Gil-Hutton derived period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=2Script error: No such module "Check for unknown parameters".).[9] Tentative measurements were also made by Italian Nicola Cornero and Federico Manzini at the Sozzago Astronomical Station Template:Obscode in May 2010, which gave a period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude (U=2−Script error: No such module "Check for unknown parameters".).[10] The same period was also determined by Eric Barbotin in February 2020, though with a higher brightness variation of Script error: No such module "val"..[10]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, Bredichina 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 an 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] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0730 and a diameter of 91.60 kilometers based on an absolute magnitude of 8.65,[14] while Fienga et al. report a diameter of [15] and estimate a mass of (9.81 ± 5.40/3.21)Template:E kg.[15] Alternative mean diameter measurements published by the WISE team include (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 corresponding albedos 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".).[4][14]

On 10 January 2015, an asteroid occultation of Bredichina gave a best-fit ellipse dimension of (Script error: No such module "val".), indicative of a highly elongated shape, with a good quality rating of 3. These timed observations are taken when the asteroid passes in front of a distant star.[4]

References

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  1. ↑ a b Script error: No such module "citation/CS1".
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  4. ↑ a b c d Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".} (PDS main page)
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Template:GPN
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  14. ↑ a b Script error: No such module "citation/CS1".
  15. ↑ a b Script error: No such module "Citation/CS1".

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External links

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