239 Adrastea

239 Adrastea is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna, and was named after the Greek nymph Adrasteia. This asteroid is orbiting the Sun at a distance of with a period of and an eccentricity of 0.23. The orbital plane is tilted at an angle of 6.17° to the plane of the ecliptic.
Photometric data collected during 2009 were used for light curve analysis of this asteroid, yielding a rotation period of with a brightness variation of in magnitude. The result is close to the period from a study performed in 2003. The asteroid is roughly 42 km in diameter.