UGC 12591

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UGC 12591
UGC12591 Hubble 4000.jpg
UGC 12591, taken by Hubble
Observation data (J2000 epoch)
Right ascension 23h 25m 21.7s[1]
Declination±00° 00′ 00″[1]
Helio radial velocity6949 ± 10[2]
Distance394.26 ± 133.84 Mly (120.880 ± 41.036 Mpc)[2]
Apparent magnitude (B)13.90[2]
Mass1.9×1012[3] M
Apparent size (V)1.7′ × 0.7′[2]
Other designations
MGC+05-55-015, PGC 71392

UGC 12591 is the second most massive spiral galaxy, after ISOHDFS 27.[citation needed] It is located about 400 million light years away from the Earth in the constellation Pegasus. In addition, it is the spiral galaxy with the highest known rotational speed[3] of about 500 km/s, almost twice that of our galaxy, the Milky Way.

The galaxy has a mass estimated at 4 times that of the Milky Way,[4] making it the second of the most massive spiral galaxies known to date.


  1. ^ a b Myers, S. T.; Jackson, N. J.; Browne, I. W. A.; De Bruyn, A. G.; Pearson, T. J.; Readhead, A. C. S.; Wilkinson, P. N.; Biggs, A. D.; Blandford, R. D.; Fassnacht, C. D.; Koopmans, L. V. E.; Marlow, D. R.; McKean, J. P.; Norbury, M. A.; Phillips, P. M.; Rusin, D.; Shepherd, M. C.; Sykes, C. M. (2003). "The Cosmic Lens All-Sky Survey - I. Source selection and observations". Monthly Notices of the Royal Astronomical Society. 341: 1. arXiv:astro-ph/0211073. Bibcode:2003MNRAS.341....1M. doi:10.1046/j.1365-8711.2003.06256.x.
  2. ^ a b c d e f "NED results for object UGC 12591". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 16 April 2017.
  3. ^ a b Giovanelli, R.; Haynes, M. P.; Rubin, V. C.; Ford, W. K., Jr. (1 February 1986). "UGC 12591 - The most rapidly rotating disk galaxy". The Astrophysical Journal Letters. 301: L7–L11. Bibcode:1986ApJ...301L...7G. doi:10.1086/184613. ISSN 0004-637X.
  4. ^ "A remarkable galactic hybrid". ESA/Hubble. Retrieved 16 April 2017.