NGC 70 is a spiral galaxy located in the constellation Andromeda.[7] It was discovered on October 7, 1855, by R. J. Mitchell[7] and was also observed on December 19, 1897 by Guillaume Bigourdan from France who described it as "extremely faint, very small, round, between 2 faint stars".[2]

NGC 70 is a member of a compact group of seven[8] or eight[9] galaxies, sometimes called the NGC 70 Group or the VV 166 Group. The group consists of three relatively bright galaxies: 70, 71 and 72 in the NGC catalog, along with four fainter galaxies. NGC 68 appears to be a group member, but its discrepant radial velocity and lack of tidal distortion suggests that it may be an unrelated galaxy along the group's line of sight.[9] In photographs the NGC 70 group resembles the much more famous Stephan's Quintet group, and it is a popular target for amateur astrophotographers.

NGC 70 (near-infrared)

References

  1. ^ a b "NASA/IPAC Extragalactic Database - NGC 70". NED. NASA/IPAC. Retrieved 23 November 2014.
  2. ^ a b c d e Seligman, Courtney. "New General Catalog Objects: NGC 50 - 99". cseligman.com. Retrieved 23 November 2014.
  3. ^ Wright, Ned. "Ned Wright's Javascript Cosmology Calculator". www.astro.ucla.edu. UCLA. Retrieved 23 November 2014.
  4. ^ a b c "NGC 70 >> Deep Sky Object Browser". Deep Sky Objects Browser. Archived from the original on 14 May 2014. Retrieved 23 November 2014.
  5. ^ a b "NGC 70". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 November 2014.
  6. ^ "WIKISKY - NGC 70". wikisky. SKY-MAP.org. Retrieved 23 November 2014.
  7. ^ a b "NGC 70". Courtney Seligman. Retrieved 14 March 2015.
  8. ^ Hickson, P.; Richstone, D.O.; Turner, E.L. (April 1977). "Galaxy collisions in dense groups". Astrophysical Journal. 213: 323–326. Bibcode:1977ApJ...213..323H. doi:10.1086/155158. Retrieved 17 November 2020.
  9. ^ a b Kormendy, John; Sargent, Wallace L. W. (1 October 1974). "Tidal Effects As Criteria for Membership In Small Groups of Galaxies: Application to VV166". Astrophysical Journal. 193: 19–25. Bibcode:1974ApJ...193...19K. doi:10.1086/153122. Retrieved 17 November 2020.
  • Media related to NGC 70 at Wikimedia Commons


Allikas: https://en.wikipedia.org/wiki/PGC_1194
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