3309 Brorfelde

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3309 Brorfelde, provisional designation Template:Mp, is a nearly spheroidal, binaryTemplate:Efn Hungaria asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 28 January 1982, by Danish astronomers Kaare Jensen and Karl Augustesen at the Brorfelde Observatory near Holbæk, Denmark.[1] It was named for the discovering observatory and the village where it is located.[2]

Orbit and classification

Brorfelde is a bright stony asteroid and member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.7–1.9 AU once every 2 years and 5 months (895 days). Its orbit has an eccentricity of 0.05 and an inclination of 21° with respect to the ecliptic.[3] The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.[1]

Physical characteristics

On the SMASS taxonomic scheme, Brorfelde is a common stony S-type asteroid.[3]

Photometry

Between 2005 and 2010, astronomers Brian Warner and Petr Pravec obtained a large number of rotational lightcurves of Brorfelde. Best rated lightcurve analysis gave a rotation period between 2.5041 and 2.5046 hours with a brightness amplitude between 0.09 and 0.13 in magnitude, indicating that the body has a nearly spheroidal shape (U=3/3/3Script error: No such module "Check for unknown parameters".).[4][5]

These results superseded photometric observations taken by Wiesław Z. Wiśniewski in the 1990s (U=2Script error: No such module "Check for unknown parameters".),[6] and by Federico Manzini and René Roy in 2005 and 2009, respectively (U=2-/n.a.Script error: No such module "Check for unknown parameters".),[7] as well as observations taken at the Palomar Transient Factory in 2010, which gave an incorrect period solution of more than 9 hours (U=1Script error: No such module "Check for unknown parameters".).[8]

Satellite

During the photometric observation in 2005, it was revealed that Brorfelde is a binary asteroid. Its asteroid moon has an orbital period of Script error: No such module "val". hours, and measures approximately 1 kilometer in diameter, based on a mean-diameter ratio of Script error: No such module "val". for the system's secondary and primary body.Template:Efn[9] In January 2014, repeated observations by Brian Warner confirmed a period of 2.503 and 18.51 hours for the primary and secondary, respectively (U=3Script error: No such module "Check for unknown parameters".),[10] with several online-published lightcurve plots.Template:Efn

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Brorfelde measures 3.78 kilometers in diameter, and its surface has an albedo of 0.46 (most recent result only).[11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2747 and a diameter of 3.91 kilometers with an absolute magnitude of 14.062.[12]

Naming

This minor planet was named on the occasion of the Brorfelde Observatory's 40th anniversary. Brorfelde was the observatory's first minor planet discovery.[2] The approved naming citation was published by the Minor Planet Center on 7 September 1987 (M.P.C. 12210Script error: No such module "Check for unknown parameters".).[13]

Notes

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References

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  8. ↑ 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".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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External links

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