1056 Azalea
1056 Azalea, provisional designation, 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. The asteroid is named after the Azalea flower.
Orbit and classification
Azalea is a member of the Flora family, a giant asteroid family and the largest family of stony asteroids in the main belt. 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. Its orbit has an eccentricity of 0.18 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins at Heidelberg in April 1928, more than 4 years after its official discovery observation.Physical characteristics
In the SMASS classification, Azalea is a common stony S-type asteroid.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. 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 and in ecliptic coordinates .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.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.