What size aperture did the telescope which was used to discover NGC 331 have?
NGC 331 NGC 331 is a spiral galaxy in the constellation Cetus. It was discovered in 1886 by Francis Leavenworth. It was described by Dreyer as "extremely faint, very small, round, a little brighter middle, 12th magnitude star 3 arcmin northeast." There are two candidates as to which object is NGC 331: PGC 2759 or PGC 3406, with the former being a much more likely candidate than the latter.
NGC 5001 NGC 5001 is a barred spiral galaxy located in the constellation Ursa major. It is designated as SB in the galaxy morphological classification scheme. It was discovered by John Herschel on 1 May 1831. It is at a distance of 130 million parsecs from the earth. 