[PAR] [TLE] NGC 331 [SEP] 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. [PAR] [TLE] Francis Preserved Leavenworth [SEP] Francis Preserved Leavenworth (born September 3, 1858 in Mount Vernon, Indiana; died November 12, 1928; a.k.a. "Frank Leavenworth") was an American astronomer.  He discovered many New General Catalogue objects together with Frank Muller and Ormond Stone.  They used a telescope with a 66-cm aperture at the Leander McCormick Observatory at the University of Virginia in Charlottesville, Virginia.
[PAR] [TLE] NGC 331 [ SEP ] 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 . [PAR] [TLE] Francis Preserved Leavenworth [ SEP ] Francis Preserved Leavenworth ( born September 3 , 1858 in Mount Vernon , Indiana ; died November 12 , 1928 ; a.k.a . " Frank Leavenworth " ) was an American astronomer . He discovered many New General Catalogue objects together with Frank Muller and Ormond Stone . They used a telescope with a 66-cm aperture at the Leander McCormick Observatory at the University of Virginia in Charlottesville , Virginia .
What size aperture did the telescope which was used to discover NGC 331 have?
What size aperture did the telescope which was used to discover NGC 331 have ?
66-cm
66-cm