As seen from theEarth, it is inclined by an angle of 18° to theline of sight along aposition angle of 145°. Themorphological classification in theDe Vaucouleurs system is SA(s)d,[2] indicating a pure spiral structure with loosely wound arms.[7] However, optical images of the galaxy indicate the presence of a weak bar structure spanning an angle of 12″ across the nucleus. There is adwarf galaxy located around 650×10^3 ly (200 kpc) to the southeast of NGC 5668, and the two may be gravitationally interacting.[2]
Threesupernovae have been observed in this galaxy:
SN1952G (type unknown, mag. 17.9) was discovered byFritz Zwicky on 18 April 1952.[8][9]
SN1954B (TypeIa, mag. 12.3) was discovered byPaul Wild on 4 May 1954.[10] [Note: Some sources incorrectly list the discovery date as 27 April 1954.][11]
SN2004G (TypeII, mag. 17.2) was discovered byReiki Kushida on 19 January 2004.[12][13][14] It was initially imaged at 43" to the west and 12".5 south of the galaxy core.[13]
High velocity clouds ofneutral hydrogen have been observed in NGC 5668, which may have their origin in supernova explosions and strongstellar winds.[15]
^abSkrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006)."The Two Micron All Sky Survey (2MASS)".The Astronomical Journal.131 (2):1163–1183.Bibcode:2006AJ....131.1163S.doi:10.1086/498708.ISSN0004-6256.S2CID18913331.
^Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups".Astronomy and Astrophysics Supplement Series.100: 47.Bibcode:1993A&AS..100...47G.
^Elias-Rosa, N.; et al. (2004), "Supernova 2004G in NGC 5668",IAU Circular (8273): 2,Bibcode:2004IAUC.8273....2E.
^Jiménez-Vicente, J.; Battaner, E. (June 2000), "Vertical motions in the disk of NGC 5668 as seen with optical Fabry-Perot spectroscopy",Astronomy and Astrophysics,358:812–818,arXiv:astro-ph/0004295,Bibcode:2000A&A...358..812J.
Media related toNGC 5668 at Wikimedia Commons
