1259 Ógyalla
1259 Ógyalla, provisional designation, is a Themistian asteroid from the outer region of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 29 January 1933, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named for the Hurbanovo Observatory.
Orbit and classification
Ógyalla is a member of the Themis family, the 9th largest main-belt asteroid family of nearly 5,000 asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.5 AU once every 5 years and 6 months. Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic. It was first identified as and at the discovering observatory in 1928, extending the asteroid's observation arc by 5 years prior to its official discovery observation.Physical characteristics
Rotation period
A rotational lightcurve of Ógyalla was obtained by the Spanish Photometric Asteroid Analysis Group in June 2016. Light curve analysis gave a well-defined rotation period of 17.334 hours with a brightness variation of 0.41 magnitude. In September 2012, photometric observations at the Palomar Transient Factory gave a period of 17.2669 and 17.3038 hours with an amplitude of 0.27 and 0.25 in the R- and S-band, respectively.The first lightcurve was already obtained in 1974, by Swedish astronomer Claes-Ingvar Lagerkvist at Uppsala Observatory from photographic photometry, but it was only fragmentary and gave a tentative period of 12 hours.