Theodor Brorsen
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Theodor Johan Christian Ambders Brorsen (July 29 1819 – May 31 1895) was a Danish astronomer.
He discovered a number of comets, including the lost periodic comet 5D/Brorsen and the periodic comet 23P/Brorsen-Metcalf.
He also discovered the gegenschein in 1854, and one NGC object: the globular cluster NGC 6539.
He observed at Altona, Germany and later at Žamberk (at the time called Senftenberg) in the present-day Czech Republic at the observatory in a castle (today a museum) belonging to Baron John Parish (an Englishman, also known as Freiherr von Senftenberg).
The asteroid 3979 Brorsen is named after him.