Discovered by S. I. Bailey MPC designation 504 Cora Alternative names 1902 LK · 1947 OH Discovered 30 June 1902 Orbits Sun Asteroid group Asteroid belt | Discovery date 30 June 1902 Minor planet category main-belt · (middle) Absolute magnitude 10 Discoverer Solon Irving Bailey | |
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504 Cora, provisional designation 1902 LK, is an asteroid from the middle region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered by American astronomer Solon Bailey at Harvard's Boyden Station in Arequipa, Peru, on 30 June 1902.
Cora orbits the Sun at a distance of 2.1–3.3 AU once every 4 years and 6 months (1,640 days). Its orbit has an eccentricity of 0.22 and an inclination of 13° with respect to the ecliptic. The body's observation arc begins 4 years after its discovery with the first used observation made at Heidelberg in 1906.
Mineralogic observations in the near-infrared with the NASA IRTF telescope using its SpeX spectrograph, showed that the surface of the X-type asteroid has absorption features which indicate the presence of pyroxene minerals. In 2004, the body's spectrum was also obtained in the SMASSII survey at the U.S. MDM Observatory, Kitt Peak, Arizona. It is also classified as a M-type on the Tholen taxonomic scheme and by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE).
Several rotational light-curves of Cora were obtained for this asteroid by astronomers Maria A. Barucci, David Higgins, Axel Martin, and the Palomar Transient Factory. With one exception, they all gave a rotation period close to 7.59 hours. Among these, David Higgins' observation made in September 2010, at the Hunters Hill Observatory (E14) in Ngunnawal, Australia – gave the best rated light-curve with a period of 7000758800000000000♠7.588±0.003 hours and a brightness variation of 0.20 magnitude (U=3-).
According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's WISE telescope with its subsequent NEOWISE mission, Cora's surface has a high albedo between 0.239 and 0.341. Combined with their respective absolute magnitudes, this results in a diameter estimate of 27.2 to 35.0 kilometers. In contrast, the Collaborative Asteroid Lightcurve Link derives a much lower albedo of 0.19 and a diameter of 29.1 kilometers, based on an absolute magnitude of 10.1.
The minor planet was named after Cora, a figure in Inca mythology (AN 169).