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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.
Referensi
- ^ Shapley, Harlow; Sawyer, Helen B. (1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S
- ^ a b Goldsbury, Ryan; et al. (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. (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 tanggal 2006-11-17.
- ^ distance × sin( diameter_angle / 2 ) = 53 ly. radius
- ^ Sollima, A.; et al. (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
Pranala luar
Koordinat:  12h 39m 28.01s, −26° 44′ 34.9″
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