NGC 539 is a barred spiral galaxy in the constellation of Cetus south. It is estimated to be 429 million light years from the Milky Way and has a diameter of approximately 200,000 ly.

400/500mm - 17.5" (12/23/92): very faint, fairly small, slightly elongated N-S, low even surface brightness. Followed by a line of three mag 13-14 stars oriented SSW-NNE located 3.2' SSE, 2.6' SE and 2.7' NE.