1304 Arosa

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1304 Arosa is a metallic asteroid in the outer part of the main asteroid belt, about 40 kilometers across. It was discovered on 21 May 1928 by German astronomer Karl Reinmuth at Heidelberg Observatory in Germany and is named after the Swiss mountain village of Arosa.

Orbit and classification: Arosa is a non-family main-belt asteroid. It orbits the Sun every about 5.72 years at a distance of roughly 2.8 to 3.6 AU. Its orbit is moderately elongated (eccentricity ~0.12) and inclined about 19 degrees to the ecliptic.

Physical properties: The asteroid spins about every 7.74 hours. Its brightness varies slightly as it rotates, by about 0.32–0.38 magnitudes. Size estimates range from about 31 to 58 kilometers, with a commonly used diameter around 41–42 kilometers. Albedo measurements span roughly 0.20 to 0.41 (reflectivity). Spectrally, it is classified as X-type in the SMASS system, and is considered metallic (M-type) by WISE.

Designations: It has several alternate designations, including 1928 KC and 1929 RY, among others.