M59-UCD3

M59-UCD3 is an ultra-compact dwarf galaxy located near the Messier 59 galaxy. As of 2015, it is the second-densest galaxy currently observed, second to M85-HCC1.[1][2]

M59-UCD3
Images of two ultracompact dwarf galaxies. M59-UCD3 is in the inset to the left, while M85-HCC1 is in the inset to the right.
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension 12h 42m 11.041s[1]
Declination+11° 38′ 41.21″[1]
Helio radial velocity373 ± 18[1]
Apparent magnitude (V)16.34 ± 0.05[1]
Absolute magnitude (V)−14.60 ± 0.09[1]
Characteristics
Mass(1.8±0.3)×108[1] M☉
Half-light radius (physical)20 ± 4[1]

References
  1. Sandoval, Michael A.; Vo, Richard P.; Romanowsky, Aaron J.; Strader, Jay; Choi, Jieun; Jennings, Zachary G.; Conroy, Charlie; Brodie, Jean P.; Foster, Caroline; Villaume, Alexa; Norris, Mark A.; Janz, Joachim; Forbes, Duncan A. (23 July 2015). "Hiding in Plain Sight: Record-breaking Compact Stellar Systems in the Sloan Digital Sky Survey". The Astrophysical Journal. 808 (1): L32. arXiv:1506.08828v2. Bibcode:2015ApJ...808L..32S. doi:10.1088/2041-8205/808/1/L32.
  2. "Undergraduates discover the densest galaxies known". Space Daily. 29 July 2015.

See also
  • M60-UCD1 (densest galaxy known, as of 2013)
  • M85-HCC1 (densest galaxy known, as of 2015)


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