Messier 68 (juga dikenal M68 atau NGC 4590 ) adalah sebuah gugus bola yang terletak pada rasi bintang Hydra . M68 ditemukan oleh Charles Messier pada tahun 1780 . M68 berada pada jarak sekitar 33.000 tahun cahaya dari Bumi .
^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode :1927BHarO.849...11S ^ a b Goldsbury, Ryan et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal 140 (6): 1830–1837, arXiv :1008.2755 , Bibcode :2010AJ....140.1830G , doi :10.1088/0004-6256/140/6/1830 . ^ a b c d Boyles, J. et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal 742 (1): 51, arXiv :1108.4402 , Bibcode :2011ApJ...742...51B , doi :10.1088/0004-637X/742/1/51 . ^ a b "SIMBAD Astronomical Database" . Results for NGC 4590 . Diakses 2006-11-17 . ^ distance × sin( diameter_angle / 2 ) = 53 ly. radius ^ Sollima, A. et al. (April 2008), "The correlation between blue straggler and binary fractions in the core of Galactic globular clusters", Astronomy and Astrophysics 481 (3): 701–704, arXiv :0801.4511 , Bibcode :2008A&A...481..701S , doi :10.1051/0004-6361:20079082
Koordinat : 12j m d Koordinat : 12j m d
12j 39m 28.01d, −26° 44′ 34.9″Koordinat: 
