NGC 1721 is a lenticular galaxy (S0) located in the constellation Eridanus. It was discovered on the 10th of Nov 1885[2] by Edward Emerson Barnard. This galaxy is a member of the NGC 1723 Group—consisting of NGC 1723 (the brightest member, 11.7-mag) and a close triplet of NGC 1721, NGC 1725 and NGC 1728.[3]

NGC 1721 is a Dreyer Object (a now archaic astronomical term), meaning that it was included in the original New General Catalogue by JLE Dreyer.[4]

References

  1. ^ a b c d e f g h i "NED results for object NGC 1721". NASA/IPAC Extragalactic Database (NED). Retrieved March 15, 2012.
  2. ^ "cseligman.com".
  3. ^ "NGC 1723 Group". DeepSkyPedia.
  4. ^ Burnham, S. W. (1894). "Observations of nebulae with the 36-inch refractor of the Lick Observatory – by S. W. Burnham (Publications of the Lick Observatory)". Publications of Lick Observatory. 2: 168. Bibcode:1894PLicO...2..168B.
  • Media related to NGC 1721 at Wikimedia Commons



Allikas: http://en.wikipedia.org/wiki/NGC_1721
No tags for this post.