748 Simeïsa

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748 Simeïsa (prov. designation: Template:Mp or Template:Mp) is a very large Hilda asteroid from the outermost regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 14 March 1913, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[1] The dark P-type asteroid has a rotation period of 11.9 hours and a shape that is reminiscent of a tetrahedron. It was the first asteroid discovery made in Russia and named after the discovering observatory and its nearby Crimean town, Simeiz.[2]

Orbit and classification

Simeïsa is a member of the distant orbital Hilda group of asteroids, which stay in a 3:2 orbital resonance with the gas giant Jupiter.[1][3][4] It is however not a member of the collisional Hilda family (001Script error: No such module "Check for unknown parameters".) but a non-family asteroid of the background population when applying the hierarchical clustering method to its proper orbital elements.[3] It orbits the Sun in the outermost asteroid belt at a distance of 3.2–4.7 AU once every 7 years and 10 months (2,864 days; semi-major axis of 3.95 AU). Its orbit has an eccentricity of 0.19 and an inclination of 2° with respect to the ecliptic.[5] The body's observation arc begins at the Heidelberg Observatory on 19 February 1920, almost 7 years after its official discovery observation by Grigory Neujmin at Simeiz.[1]

Naming

This minor planet was named after the discovering Simeiz Observatory and its nearby Crimean town, Simeiz. Simeïsa was the first minor planet discovered in Russia. The Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 75Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In the Tholen classification, Simeïsa is a dark and primitive P-type asteroid,[5] which are common in the outer regions of asteroid belt and among the Jupiter trojan population. In the SDSS-based taxonomy, it is an X-type asteroid.[6][4]

Rotation period

In October 2011, a rotational lightcurve of Simeïsa was obtained from photometric observations by French amateur astronomer René Roy. 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=2Script error: No such module "Check for unknown parameters".).[7] In the 1990s, Mats Dahlgren already determined a 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".).[8]

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, Simeïsa 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.[9][10][11][12]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.0376 and derives a diameter of 102.79 kilometers based on an absolute magnitude of 9.12.[13] Alternative mean diameter measurements published by the WISE team include (Script error: No such module "val".) and (Script error: No such module "val".) with corresponding albedos of (Script error: No such module "val".) and (Script error: No such module "val".).[13][4]

Two asteroid occultations on 4 March 1999 and 7 January 2006, gave a best-fit ellipse dimension of (Script error: No such module "val".) and (Script error: No such module "val".), respectively, each with a quality rating of 2.[4] These timed observations are taken when the asteroid passes in front of a distant star.[4]

References

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

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External links

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