986 Amelia

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986 Amelia (prov. designation: Template:Mp or Template:Mp) is a large background asteroid from the outer regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 19 October 1922, by Spanish astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona.[1] The L/D-type asteroid has a rotation period of 9.5 hours.Template:Efn It was named after the discoverer's wife, Amelia Solà.[2]

Orbit and classification

Amelia 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] It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.8 AU once every 5 years and 6 months (2,024 days; semi-major axis of 3.13 AU). Its orbit has an eccentricity of 0.20 and an inclination of 15° with respect to the ecliptic.[5]

On 12 May 2015, Amelia was first observed as Template:Mp (Template:Mp) at the Simeiz Observatory on the Crimean peninsula. The body's observation arc begins at the Algiers Observatory in May 1926, more than 3 years after to its official discovery observation at the Fabra Observatory.[1]

Naming

This minor planet was named after Amelia Solà, wife of the discoverer Josep Comas i Solà (1868–1937). The official Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 94Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Amelia is a T-type asteroid,[6] while in the SDSS-based taxonomy, the asteroid has been classified as an L-type.[4][7]

Rotation period and poles

In October 2000, a rotational lightcurve of Amelia was obtained from photometric observations by American amateur astronomer Robert A. Koff at the Thornton Observatory Template:Obscode in Colorado. Lightcurve analysis gave a well-defined rotation period of Script error: No such module "val". hours with a brightness amplitude of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[4][8]Template:Efn

In December 2006, a concurring period determination of Script error: No such module "convert". was made by astronomers Raymond Poncy, Enric Forné, Hiromi Hamanowa, Hiroko Hamanowa and Hilari Pallarés (U=3Script error: No such module "Check for unknown parameters".).[9] In 2016, a modeled lightcurves using photometric data from various sources, rendered a concurring sidereal period of Script error: No such module "val". and two spin axes of (80.0°, 30.0°) and (282.0°, 30.0°) in ecliptic coordinates.[10]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Amelia 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 derives an albedo of 0.1183 and a diameter of 50.94 kilometers based on an absolute magnitude of 9.4.[14] An asteroid occultation, observed on 2 November 2006, gave a best-fit ellipse dimension of 51.0 × 51.0 kilometers.[4] These timed observations are taken when the asteroid passes in front of a distant star. However the quality of the measurement is rated poorly.[4]

Notes

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References

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  1. ↑ a b Script error: No such module "citation/CS1".
  2. ↑ a b Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ a b c d e Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1". (PDS data set)
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  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". (online, AcuA catalog p. 153)
  14. ↑ Script error: No such module "citation/CS1".

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External links

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