Discovered by J. Comas Solà MPC designation 1626 Sadeya Minor planet category main-belt · Phocaea Discovered 10 January 1927 Orbits Sun Discovery site Fabra Observatory | Discovery date 10 January 1927 Alternative names 1927 AA · 1956 AA Observation arc 89.66 yr (32,750 days) Absolute magnitude 11.1 Discoverer Josep Comas i Solà Asteroid group Asteroid belt | |
Similar 1188 Gothlandia, 1102 Pepita, Sun, Solar System, Asteroid belt | ||
1626 Sadeya, provisional designation 1927 AA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 10 January 1927, Catalan astronomer Josep Comas i Solà at Fabra Observatory in Barcelona, Spain.
The stony S-type asteroid is a member of the Phocaea family, a smaller group of asteroids in the inner main-belt with rather high inclinations between 18° and 32°. It orbits the Sun at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,328 days). Its orbit has an eccentricity of 0.27 and an inclination of 25° with respect to the ecliptic. Sadeya's observation arc begins 2 months after its official discovery with a precovery taken at Yerkes Observatory.
Sadeya has a well-defined rotation period between 3.414 and 3.438 hours with a change in brightness between 0.07 and 0.22 in magnitude (U=2+/3-/3). These numerous rotational light-curves were obtained by ESO astronomers, Julian Oey, Pierre Antonini, Ramon Naves, Enric Forné, Hilari Pallares, Brian D. Warner and Vladimir Benishek between 1996 and 2014.
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sadeya measures between 14.25 and 15.14 kilometers in diameter, and its surface has an albedo between 0.30 and 0.512. The Collaborative Asteroid Lightcurve Link assumes a lower albedo of 0.23 – derived from 25 Phocaea, the namesake of the Phocaea family – and calculates a diameter of 15.95 kilometers, based on an absolute magnitude of 11.2.
This minor planet was named after the Spanish and American Astronomical Society (Spanish: Sociedad Astrónomica de España y América), also known by its acronym "Sadeya". It was founded by Comas i Solà, who also was its first president. Naming citation was published before November 1977 (M.P.C. 2277).