785 Zwetana is a minor planet orbiting the Sun that was discovered by Adam Massinger an assistant at the Heidelberg Observatory on March 30 1914. Radar observations indicate that it is metallic.[citation needed]In 1990 the asteroid was observed from the European Southern Observatory allowing a composite light curve to be produced that showed a rotation period of 8.919 ± 0.004 hours and a brightness variation of 0.13 ± 0.01 in magnitude.
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