Two nights later , it was independently discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 15 September 1931 .
Marina was discovered on 13 September 1931 , by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula .
Two nights later , Marina was independently discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 15 September 1931 .
Marina was discovered on 13 September 1931 , by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula .