Discovered by K. Reinmuth MPC designation 1259 Ógyalla Discovered 29 January 1933 Discoverer Karl Wilhelm Reinmuth Asteroid group Asteroid belt | Discovery date 29 January 1933 Orbits Sun | |
Alternative names 1933 BT · 1928 DJ11928 FO · 1929 MA1935 QE1 · 1949 YN1956 JF Discovery site Landessternwarte Heidelberg-Königstuhl Similar 1862 Apollo, Sun, 1419 Danzig, 1056 Azalea, 1111 Reinmuthia | ||
1259 Ógyalla, provisional designation 1933 BT, is a stony 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.
Ógyalla is a S-type asteroid asteroid and member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 6 months (1,996 days). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic. It was first identified as 1928 DJ1 and 1928 FO at the discovering observatory in 1928, extending the asteroid's observation arc by 5 years prior to its official discovery observation.
A rotational light curve of Ógyalla was obtained by the Spanish Photometric Asteroid Analysis Group (OBAS) in June 2016. Light curve analysis gave a well-defined rotation period of 17.334 hours with a brightness variation of 0.41 magnitude (U=3). 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 (U=2/2). The first light curve 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 (U=1).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ógyalla measures between 26.59 and 36.11 kilometers in diameter, and its surface has an albedo between 0.064 and 0.10 (without preliminary results). The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0916 and a diameter of 33.31 kilometers based on an absolute magnitude of 10.6.
This minor planet was named for the Hurbanovo Observatory (IAU code 551; formerly known as O'Gyalla Observatory), a seismological, meteorological and astronomical observatory in the former Hungarian city of Ógyalla. Since 1948, the city belongs to Slovakia and is now known as Hurbanovo. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116).