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1056 Azalea

Florian asteroid From Wikipedia, the free encyclopedia

1056 Azalea
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1056 Azalea, provisional designation 1924 QD, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 31 January 1924, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[15] The asteroid is named after the Azalea flower.[3]

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Orbit and classification

Azalea is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main belt.[4][5][16]:23 It orbits the Sun in the inner main belt at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,216 days). Its orbit has an eccentricity of 0.18 and an inclination of 5° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg in April 1928, more than 4 years after its official discovery observation.[15]

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Physical characteristics

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In the SMASS classification, Azalea is a common stony S-type asteroid.[1]

Rotation period

In 2004, two rotational lightcurves of Azalea were obtained from photometric observations by a group of predominately Polish astronomers including Agnieszka Kryszczyńska, as well as by astronomers Alain Klotz and Raoul Behrend. Lightcurve analysis gave a rotation period of 15.03 and 15.15 hours with a high brightness variation of 0.70 and 0.79 magnitude, respectively (U=2/2).[12][13] The high brightness amplitude is typically indicative for a non-spheroidal shape.

Spin axis

In 2013, an international study modeled a lightcurve with a concurring period of 15.0276 hours and found two spin axis of (252.0°, 51.0°) and (64.0°, 41.0°) in ecliptic coordinates (λ, β) (U=n.a.).[11]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Azalea measures between 10.66 and 13.07 kilometers in diameter and its surface has an albedo between 0.223 and 0.34.[6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 12.40 kilometers based on an absolute magnitude of 11.7.[4]

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Naming

This minor planet was named after the genus of flowering shrubs, Azalea, which are rhododendrons with funnel-shaped corollas.[3] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 100).[3]

References

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