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RA: 07h 17m 44s
Dec: −15° 38′ 30″
Con: Canis Major
Ch: MSA:321, U2:274, SA:12
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 13r
Mag: B=7.62, V=7.2
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Synonyms: H VII-012
Discovered by Caroline Herschel.
Synonyms: H VII-012
"A beautiful cluster cluster of pretty compressed stars, near half a degree diameter."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "Middle of a fine large, rich cluster, not compressed to the middle. Stars 9..12th mag; fills field."
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "beautiful cluster . . melting into a very rich neighbourhood, as though the Galaxy were approaching us. 64x includes a bright white star preceding. Smyth notes that the stars are nearly all 10th mag. 3 degrees following Gamma."
Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
"cluster, fairly condensed."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 11' and the class as 1 2 r.
Vorontsov-Velyaminov, B. (1925) "Catalogue of integrated magnitudes of star clusters", Astron. Nach. 226.195. Comparing the brightness of the cluster with the extrafocal images of stars, he estimates the magnitude as 6.96.
"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"reguilar, condensed, in rich region." He gives the approx. diameter as 15 arcmin.
Photo Index by Jim Lucyk: Burnhams V1 p440.
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.0 mag open cluster.
Listed by the Herschel Club, described as "very pretty cluster with bright stars of varying magnitudes, no shape, scattered, near 6th mag star in field. 8-inch, 48x."
Burnham calls this a very large, rich, pretty compressed open cluster, 10' across, 9th magnitude, consisting of 50 stars of 9..12th mag.
Hartung calls this a "beautioful open cluster of fairly bright stars, nearly 20' across, well concentrated towards the centre, and merging into the rich field with long irregular rays. It is a most attractive object, rich and delicate with 10.5cm.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "7.5M; 10' extent; 50-plus 10M and dimmer members; condensed; concentration of stars off-center to NW; 5.5M SAO 152641 is the bright star a few minutes due W."
Donald J. Ware:"This is a large open cluster, 12-15' in diameter, with about 75 stars well concentrated to the center. It is visible in the viewfinder and impressive through the telescope."
Observer: John Callender (e-mail: email@example.com, web: http://www.west.net/~jbc/); Instrument: 50-mm binoculars Location: Carpinteria, CA, USA; Light pollution: light Transparency: good Seeing: fair; Time: Wed Feb 5 05:05:00 1997 UT Obs. no.: 52
Medium-sized, fairly dim glow in 7x50s.
Steve Coe, using a 17.5" f/4.5, notes: "Bright, large, compressed, rich and round. Easy in 8X50 finder. At 100X there are about 20 pretty bright stars with another 50 for fill in. This is a winter favorite."
15cm - vround. few br *s; 50 *s total m9.5+ in 15' diam. sim to M23. BS, 1Nov1970, FtL.
- sm cl of dim *s. appears to be dk hole in center. *s arranged in various geom patterns. 75 *s vis in 20' area, m10+. grand @ 76x. BS, 28Dec1970, FtL.
- exquisite irreg round cl @ 50x, which shows stragglers to 18' diam, viz. beyond brtr * on E but not so extensive as sim-br * NNE. 80x: 120 *s counted. core oval 8'x5' in pa160, about 60 *s in this area. *s have rel uniform brtness, sim to that of rich surrounding fld. BS, 20Mar1988, Anderson Mesa.
25cm - 180x: vbr w/br * on E. SW side flattened, as a sphere of putty dropped on a table. on N side are three parallel bands of *s elong ~N-S. on SE are other radial bands. 10'-12' diam w/100 *s.
30cm - fills 22' fld. 90-100*s. N side lacks outliers. interior elong E-W, eight br *s. S side rich in f *s. on E is m9 * 10' from center.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (95x, 218x)
Look at the article Dec 2005 for my description. Notes: It's lovely and different, a sugar-pile cluster of many, many faint stars densely packed, thick swarms quite unlike the scattering we've been looking at. Near the middle the brightest stars line up in three rows, running north north-west to south-south east. It is unusually old for an open cluster, 1.3 billion years, and is about 5,000 light-years distant.
Instrument:12-inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible.
Transparency Of the Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
First Impression:This object looks like an open cluster.
Chart Number:No.96(Extract taken out of "The Night Sky Observers Guide Volume One").
Size:26mm Eyepiece:Field Of View:57'/4=14.2'.
20mm Eyepiece:Field Of View:50'/3.5=14.2'.
Size in Arc Minutes:14.2'.
Open Cluster is 14.2'*4.7'.
Brightness Profile:From the central outskirts of this cluster it grows slightly brighter.
This open cluster is well detached because all the stars in this cluster look almost compact.In this open cluster I have counted 65 stars within a fixed diameter and all the stars are nearly the same brightness as each other.NGC 2360 is a rich open cluster and that it has an irregular shape.Most of the stars are clumped together in a large chain of 11th to 12th magnitude stars.
Observing site: Little Tycho Observatory
[7h 17m 48s, -15° 37' 0"] A small scattering of 9...mv stars. Most of the faint stars in the finder chart with the cluster are not visible in tonight's light pollution.
The Messier objects
The Bennett objects
The Caldwell list
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