|
Description of NGC 6121 |
Messier 4 (also known as M4 or NGC 6121) is a globular cluster in the constellation Scorpius. It was discovered by Philippe Loys de Cheseaux in 1746 and catalogued by Charles Messier in 1764.
M4 was the first globular cluster in which individual stars were resolved. M4 is conspicuous in even the smallest of telescopes as a fuzzy ball of light. It is also the one of the easiest globular clusters to find, being located only 1.3 degrees west of the bright star Antares, with both objects being visible in a wide field telescope. Modestly sized telescopes will begin to resolve individual stars of which the brightest in M4 are of apparent magnitude 10.8. The cluster carries a characteristic "bar" structure across its core, visible in images (including the one below, extending from upper left to lower right) and moderate sized telescopes. The structure consists of 11th magnitude stars and is approximately 2.5' long and was first noted by William Herschel in 1783.
Source: Wikipedia | Notify inaccuracies |
Image |
Image of the cluster from the Digital Sky Survey |
Other Resources
for
NGC 6121 |
|
ADS "Object Search"
| C. Clement variables data | SEDS data | Google Sky | Web Links for this cluster (2 links in the database at the moment) | Users comments for this cluster (0 comments in the database at the moment) | Selected biblio | Paper n. 1 |
Valcarce, A. A. R.; Catelan, M.; Alonso-García, J.; Cortés, C.; De Medeiros, J. R. Constraints on Helium Enhancement in the Globular Cluster M4 (NGC 6121): The Horizontal Branch Test 2014, The Astrophysical Journal, Volume 782, Issue 2, article id. 85, 8 pp. (NGC 6121 ) | Paper n. 2 |
Yong, David; Karakas, Amanda I.; Lambert, David L.; Chieffi, Alessandro; Limongi, Marco Heavy Element Abundances in Giant Stars of the Globular Clusters M4 and M5 2008, The Astrophysical Journal, Volume 689, Issue 2, pp. 1031-1043 (NGC 6121 NGC 5904 ) | Paper n. 3 |
Hansen, Brad M. S.; Richer, Harvey B.; Fahlman, Greg. G.; Stetson, Peter B.; Brewer, James; Currie, Thayne; Gibson, Brad K.; Ibata, Rodrigo; Rich, R. Michael; Shara, Michael M. Hubble Space Telescope Observations of the White Dwarf Cooling Sequence of M4 2004, The Astrophysical Journal Supplement Series, Volume 155, Issue 2, pp. 551-576 (NGC 6121 ) | See all items
(5 papers) :: Submit a paper |
Tutor(s) for this cluster:
Still nobody, you could be the first! |
|