| Type | Globular Cluster |
|---|---|
| Magnitude | 5.1 |
| Size | 24' |
| RA (2000) | 18h 36' 24.2" |
| Dec (2000) | 23° 54' 12" S |
| Constellation | Sagittarius |
| Description | vB, vL, R, vRi, vmC |
Andrew Cooper
11 Jun 2010 Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 175x
Large! Bright! a spectacular cluster in a large scope, fully resolved, not notably concentrated at the core, a coarse appearance lent by an assortment of magnitudes in the stellar population, a very rich Milky Way starfield makes it difficult to ascertian the margins and judge the size
Andrew Cooper
24 May 1998 Picacho Peak State Park, AZ (map)
20cm f/10 SCT
Bright, pretty compact globular cluster, stars easily resolved
Charles Messier
5 Jun 1764
Nebula, below the ecliptic, between the head and the bow of Sagittarius, near a star of 7th magnitude, 25 Sagittarii, according to Flamsteed, this nebula is round, it doesn't contain any star, & one can see it very well in an ordinary telescope of 3.5-foot; the star Lambda Sagittarii served for determination. Abraham Ihle, a German, discovered it in 1665, while observing Saturn. M. Le Gentil observed it in 1747, & he made an engraving of it. Memoirs of the Academy, year 1759, page 470. Seen again March 22, 1781; it is reported in the English Atlas. "
Rev. T.W. Webb
Hardwick, Herefordshire, England (map)
Beautiful bright cl., very interesting from visibility of components, largest 10 and 11 mg., which makes it a valuable object for common telescopes, and a clue to the structure of many more distant or difficult neb. h., makes all the stars of two sizes, 11 and 15 mg., as if 'one shell over another,' and thinks the larger ones ruddy. Midway between μ and σ.
William Herschel
20 ft Newtonian
A most beautiful extensive cluster of stars, of various magnitudes, very compressed in the middle, and about 8' in diameter, besides the scattered ones, which do fill the extent of the field of view [15']: the large stars are red; the small ones are pale red.
Drawings, descriptions and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission. Use for non-profit and educational reasons is generally given on request.
Positional and some physical information is from the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Additional object data from the SIMBAD database, operated at CDS, Strasbourg, France.
The Digitized Sky Survey was produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope.
Dark nebulae data from E.E. Barnard, A Photographic Atlas of Selected Regions of the Milky Way. Ed. Edwin B. Frost and Mary R. Calvert. Carnegie Institution of Washington, 1927
Object descriptions of Rev. Webb from Celestial Objects for Common Telescopes sixth edition, Rev. T.W. Webb, 1917, edited by Rev T.E.Espin.