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1223 Neckar
1223 Neckar, provisional designation 1931 TG, is a stony asteroid from the outer region of the asteroid belt, about 26 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany on 6 October 1931.〔
The S-type asteroid is a member of the Koronis family, thought to have been formed at least two billion years ago in a catastrophic collision between two larger bodies. It orbits the Sun at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,775 days). Its orbit shows an eccentricity of 0.06 and is tilted by 3 degrees to the plane of the ecliptic. It has a rotation period of 7.83 hours, observed by the ''Palomar Transient Factory Survey'' in 2010,〔 and an albedo in the range of 0.12 to 0.20, according to the surveys carried out by Akari and WISE/NEOWISE.〔〔〔〔
The minor planet was named after the 367-kilometre-long river Neckar, running through the southwestern parts of Germany and in particular through the city of Heidelberg, location of the discovering observatory. The river origins in the Black Forrest and flows into the Rhine river.〔
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