Obituary: AN 137, 367 (1895)
Brorsen discovered one NGC object: the globular cluster NGC 6539 in Ophiuchus. He found it at Senftenberg Observatory (Zamberk castle) using a small refractor in 1856. It is included as #39 in Arthur Auwers' list of new nebulae in William Herschel's Verzeichnisse von Nebelflecken und Sternhaufen, Königsberg 1862. Brorsen has also found NGC 2024 near Zeta Ori in 1850 (see AN #751), but this nebula has been already discovered by William Herschel (V 28).