893 Leopoldina

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893 Leopoldina (prov. designation: Template:Mp or Template:Mp) is a large and elongated background asteroid from the outer regions of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg Observatory on 31 May 1918.[1] The dark carbonaceous C-type asteroid has a rotation period of 14.1 hours and measures approximately Script error: No such module "convert". in diameter. It was named for Germany's national academy, the Academy of Sciences Leopoldina in Halle.[2]

Orbit and classification

Leopoldina 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 2.6–3.5 AU once every 5 years and 4 months (1,950 days; semi-major axis of 3.05 AU). Its orbit has an eccentricity of 0.15 and an inclination of 17° with respect to the ecliptic.[5] The body's observation arc begins with its official discovery observation at Heidelberg Observatory on 31 May 1918.[1]

Physical characteristics

In the Tholen classification, LeopoldinaTemplate:'s asteroid spectral type is closest to that of an X-type, and somewhat similar to that of a dark F-type asteroid (XF), while in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), it is a common carbonaceous C-type asteroid.[5][4][6]

Naming

This minor planet was named for Germany's national academy, the Academy of Sciences Leopoldina (Template:Langx) in Halle, Saxony-Anhalt. The Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 86Script error: No such module "Check for unknown parameters".).[2]

Rotation period

In April 2008, a rotational lightcurve of Leopoldina was obtained from photometric observations by Brian Warner at the Palmer Divide Observatory Template:Obscode in Colorado. Analysis gave a classically shaped bimodal lightcurve with a well-defined rotation period of Script error: No such module "val". hours and a brightness variation of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[7]Template:Efn The result supersedes Warner's previous observation from August 2005, which determined a period of Script error: No such module "val". hours and 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 survey 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), Leopoldina 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.[9][10][11] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0497 and a diameter of 76.14 kilometers based on an absolute magnitude of 9.47.[12]

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 albedos in the range of 0.049 to 0.06.[4][12]

Three asteroid occultation were obtained on 29 January 1996, 30 August 2010 and 16 May 2015. They gave a best-fit ellipse dimension of 79.0 × 72.0 kilometers, 82.8 × 59.8 kilometers (best), and 75.0 × 75.0 kilometers, respectively. These timed observations are taken when the asteroid passes in front of a distant star.[4]

Notes

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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. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ a b Script error: No such module "citation/CS1".

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External links

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