1186 Turnera

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1186 Turnera, provisional designation Template:Mp, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 1 August 1929, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[1] The asteroid was later named after British astronomer Herbert Hall Turner.[2]

Classification and orbit

Turnera is a member of the Eos family (606Script error: No such module "Check for unknown parameters".), the largest asteroid family in the outer main-belt with nearly 10,000 known members.[3][4]Template:Rp It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,922 days). Its orbit has an eccentricity of 0.10 and an inclination of 11° with respect to the ecliptic.[5] Turnera was first identified as Template:Mp at Simeiz Observatory in September 1919. This observation, however, remains unused and the body's observation arc begins at Johannesburg with its official discovery observation in 1929.[1]

Physical characteristics

In the Tholen classification, Turnera is a common, stony S-type asteroid. In the SMASS classification, it is a Sq-type that transitions to the Q-type asteroids.[5] Generically, Eoan asteroids are also characterized as K-type asteroids with an albedo of 0.13.[4]Template:Rp

Lightcurves

In January 2016, the best-rated rotational lightcurve of Turnera was obtained from photometric observations by the Spanish amateur astronomer group OBAS, Observadores de Asteroids. Lightcurve analysis gave a well-defined rotation period of 12.085 hours with a brightness variation of 0.31 magnitude (U=3Script error: No such module "Check for unknown parameters".).[6] Previously, American astronomer Brian Warner obtained a similar period of 12.066 hours and an amplitude of 0.34 magnitude at his Palmer Divide Observatory (716Script error: No such module "Check for unknown parameters".) in Colorado (U=2+Script error: No such module "Check for unknown parameters".).[7]Template:Efn

Other lightcurve observations were made by French amateur astronomer Laurent Bernasconi (Script error: No such module "val". hours; Δmag of 0.25; U=2+Script error: No such module "Check for unknown parameters".) in February 2006,[8] and by Italian astronomer Maria A. Barucci (12.010 hours; Δmag of 0.20; U=2Script error: No such module "Check for unknown parameters".) in August 1987.[9]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Turnera measures between 34.290 and 39.691 kilometers in diameter and its surface has an albedo between 0.12 and 0.2919.[10][11][12][13][14][15]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2919 and a diameter of 35.56 kilometers with an absolute magnitude of 9.20.[16]

Naming

This minor planet was named after British astronomer Herbert Hall Turner (1861–1930), director of the Radcliffe Observatory at University of Oxford.[2] He is also credited with coining the term "parsec". The official naming citation was published in Paul Herget's The Names of the Minor Planets in 1955 (H 110Script error: No such module "Check for unknown parameters".).[2]

Notes

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References

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  13. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
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External links

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