Messier 4 - NGC 6121

No dss image available for Messier 4
Aladin viewer for the region around Messier 4
Lac I.9, Bode 31, GC 4183, C 1620-264, ESO 517-SC001

Type  Globular Cluster
Magnitude  5.9
Size  26.3'
Right Ascension  16h 23' 35.3"  (2000)
Declination  26° 31' 33" S
Constellation  Scorpius
Description  Cl, 8 or 10 B* in line, rrr
Classification  IX
Observing Notes

Andrew Cooper
Jun 29, 2019    Kaʻohe, Mauna Kea, HI (map)
8x42mm Nikon Prostaff 3S Binoculars @ 8x
Seeing: 8 Transparency: 7 Moon: 0%

Easy to find beside Antares, bright, small, unresolved, a round fuzzy brighter in the middle

Andrew Cooper
Jun 29, 2019    Kaʻohe, Mauna Kea, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 56x
Seeing: 8 Transparency: 7 Moon: 0%

A large and beautiful cluster, an excellent globular beside Antares, large, bright, fully resolved, a notable bar of brighter stars across the central core

Andrew Cooper
Aug 12, 2017    Waikoloa, HI (map)
Hodgepodge w/TV-76mm f/6 APO @ 30x
Seeing: 6 Transparency: 6 Moon: 0%

A pretty globular, easy to fins in the same field as Antares, round, 10' across, dense, nicely concentrated, just resolved with the 76mm at 30x, in a pretty field

Andrew Cooper
Apr 19, 2012    Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 175x
Seeing: 6 Transparency: 7 Moon: 0%

A large loose globular with a distinctive line of brighter stars runing north-south across the center, a coarse appearance, with chains of stars sweeping out from the center

Andrew Cooper
Apr 18, 2010    Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 175x
Seeing: 6 Transparency: 7 Moon: 0%

Large! Bright! fully resolved, about 20' across, a distinctive line of stars crosses the core north to south, a beautiful object

Andrew Cooper
Apr 15, 2007    Pu'u Kuainiho (map)
76mm f/6 APO

Bright, large, a rich well concentrated globular just 1.3° west of Antares, 5' across the central condensation maybe 15' to the outliers, a brighter ridge of stars runs north-south across the center of the cluster

Andrew Cooper
Jun 28, 1998    Santa Rita Mts., AZ (map)
20cm f/10 SCT

Rich, compact, much looser and smaller than M22 (Just there a couple minutes ago)

Rev. T.W. Webb
May 19, 1885    Hardwick, Herefordshire, England (map)

Large, rather dim, resolvable, followed by a vacant starless space [B44]. h has remarked many vacancies of this kind.
― Celestial Objects for Common Telescopes, T. W. Webb, 1917

Charles Messier
May 8, 1764    

Cluster of very small stars; with an inferior telescope, it appears more like a nebula; this cluster is situated near Antares & on its parallel. Observed by M. de la Caille, & reported in his catalogue. Seen again January 30 & March 22, 1781
― Connaissance des Temps, 1781

William Herschel
45cm f/12.8 Herschelian speculum

The cluster contains a ridge of stars in the middle, running from south preceding to north following.
Other Data Sources for Messier 4
Nearby objects for Messier 4
4 objects found within 60'
Alniyat Collinder 302

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

Messier 4