1206 Numerowia
1206 Numerowia is an asteroid from the outer region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany on 18 October 1931, and named after Russian astronomer Boris Numerov.
Orbit and classification
Numerowia orbits the Sun in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months. Its orbit has an eccentricity of 0.05 and an inclination of 13° with respect to the ecliptic. The asteroid's observation arc begins at Heidelberg four days after its official discovery observation.Physical characteristics
Rotation period and poles
In February 2006, a rotational lightcurve of Numerowia was obtained from photometric observations by astronomer Lawrence Molnar and colleges at the Calvin–Rehoboth Observatory in New Mexico, United States. Lightcurve analysis gave a well-defined rotation period of 4.7743 hours with a high brightness variation of 0.63 magnitude, indicating that the body has a non-spheroidal shape.A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database, gave a concurring period of 4.77529 hours, as well as 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, Numerowia measures between 14.173 and 15.63 kilometers in diameter and its surface has an albedo between 0.141 and 0.168.The Collaborative Asteroid Lightcurve Link assumes a standard albedo for C-type asteroid of 0.057 and consequently calculates a larger diameter of 27.90 kilometers using an absolute magnitude of 11.5.