891 Gunhild

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891 Gunhild (prov. designation: Template:Mp or Template:Mp) is a large background asteroid from the outer regions of the asteroid belt, that measures approximately Script error: No such module "convert". in diameter. It was discovered on 17 May 1918, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The dark D-type asteroid has a rotation period of 11.9 hours. Any reference of the asteroid's name to a person is unknown.[2]

Orbit and classification

Gunhild 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 2.8–2.9 AU once every 4 years and 10 months (1,769 days; semi-major axis of 2.86 AU). Its orbit has an eccentricity of 0.03 and an inclination of 14° with respect to the ecliptic.[5] The asteroid was first observed as Template:Mp (Template:Mp) at Simeiz Observatory in November 1915. The body's observation arc begins at Heidelberg Observatory on 18 May 1918, the night after its official discovery observation.[1]

Naming

This minor planet is named after a Feminine German first name. Any reference of this name to a person or occurrence is unknown.[2]

Unknown meaning

Among the many thousands of named minor planets, Gunhild is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between Template:Mp and Template:Mp and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[6]

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), as well as in the SDSS-based taxonomy, Gunhild is a dark D-type asteroid.[4][7][8] This asteroid spectral type is common among outer belt asteroids and very common among the Jupiter trojan population.

Rotation period

In July 2015, a rotational lightcurve of Gunhild was obtained from photometric observations by the Spanish group of asteroid observers, OBAS. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness amplitude of Script error: No such module "val". magnitude (U=3−Script error: No such module "Check for unknown parameters".).[9] The result supersedes period determinations of (Script error: No such module "val".) by Robert Stephens in 2000,[10] (Script error: No such module "val".) by Laurent Bernasconi in 2005,[11] and (Script error: No such module "val".) by Janus Kozdon in 2015 (U=2/2/2+Script error: No such module "Check for unknown parameters".).[12]

Diameter and albedo

According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Gunhild 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.[13][14][15] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0656 and a diameter of 51.89 kilometers based on an absolute magnitude of 10.0.[16] Alternative mean-diameter measurements published by the WISE team include (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".) and (Script error: No such module "val".).[4][16][17] Several asteroid occultation observed between 2010 and 2014 gave a best-fit ellipse dimension of 52.0 × 52.0 kilometers (one observation) and 63.0 × 63.0 kilometers (three observations). 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".
  2. ↑ a b Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ a b c d 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".
  8. ↑ Script error: No such module "Citation/CS1". (PDS data set)
  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".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  16. ↑ a b Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".

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External links

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