1018 Arnolda
1018 Arnolda, provisional designation, is a stony asteroid from the central regions of the asteroid belt, approximately 16 kilometers in diameter. It was discovered on 3 March 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after physicist Arnold Berliner.
Classification and orbit
Arnolda is not a member of any known asteroid family. It orbits the Sun in the central main belt at a distance of 1.9–3.2 AU once every 4 years and 1 month. Its orbit has an eccentricity of 0.25 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins nine days prior to its official discovery observation at Heidelberg.Physical characteristics
Arnolda is an assumed stony S-type asteroid, a very common type in the inner and in parts of the central asteroid belt.Lightcurves
In May 2005, the best-rated rotational lightcurve of Arnolda was obtained from photometric observations by Australian astronomers at the Oakley Southern Sky Observatory. Lightcurve analysis gave a rotation period of 14.617 hours with a brightness variation of 0.33 magnitude. Several other astronomers obtained number of lesser-rated lightcurves with a shorter period.Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arnolda measures between 13.68 and 16.557 kilometers in diameter and its surface has an albedo between 0.29 and 0.439.The Collaborative Asteroid Lightcurve Link derives a high albedo of 0.3760 and a diameter of 16.44 kilometers based on an absolute magnitude of 10.60.