Messier 4

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M 4
Messier 4 Hubble WikiSky.jpg
Messier 4 bi Hubble Space Telescope; 3.5′ view
Credit: NASA/STScI/WikiSky
Observation data (J2000 epoch)
Richt ascension16h 23m 35.22s[2]
Declination–26° 31′ 32.7″[2]
Distance7.2 kly (2.2 kpc)
Apparent magnitude (V)+5.9[3]
Apparent dimensions (V)26′.0
Pheesical chairacteristics
Mass6.7×104[4] M
Radius35 licht years
Metallicity = –1.07[5] dex
Estimatit age(12.2 ± 0.2) Gyr[6]
Notable featurs1°.3 wast o Antares
Ither designationsNGC 6121[3]
See an aw: Globular cluster, Leet o globular clusters

Messier 4 or M4 (an aw designatit NGC 6121) is a globular cluster in the constellation o Scorpius. It wis diskivert bi Philippe Loys de Chéseaux in 1745 an catalogued bi Charles Messier in 1764. It wis the first globular cluster in that individual starns war resolved.

References[eedit | eedit soorce]

  1. Shapley, Harlow; Sawyer, Helen B. (August 1927). "A Classification of Globular Clusters". Harvard College Observatory Bulletin. 849 (849): 11–14. Bibcode:1927BHarO.849...11S.
  2. 2.0 2.1 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.
  3. 3.0 3.1 "M 4". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-03-25.
  4. Marks, Michael; Kroupa, Pavel (August 2010). "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way". Monthly Notices of the Royal Astronomical Society. 406 (3): 2000–2012. arXiv:1004.2255. Bibcode:2010MNRAS.406.2000M. doi:10.1111/j.1365-2966.2010.16813.x. Mass is from MPD on Table 1.
  5. Marino, A. F.; et al. (November 2008). "Spectroscopic and photometric evidence of two stellar populations in the Galactic globular cluster NGC 6121 (M 4)". Astronomy and Astrophysics. 490 (2): 625–640. arXiv:0808.1414. Bibcode:2008A&A...490..625M. doi:10.1051/0004-6361:200810389.
  6. Caputo, F.; Castellani, V.; Quarta, M. L. (February 1985). "Reddening, distance modulus and age of the globular cluster NGC 6121 (M4) from the properties of RR Lyrae variables". Astronomy and Astrophysics. 143 (1): 8–12. Bibcode:1985A&A...143....8C.

Coordinates: Sky map 16h 23m 35.41s, −26° 31′ 31.9″