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RA: 08h 51m 18s
Dec: +11° 48′ 0″
Ch: MSA:736, U2:187, SA:12
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 23r
Mag: B=7.6, V=6.9
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In the Philosophical Transactions, 1818, William Herschel wrote: "1783, 7 feet telescope, a cluster of stars. 1809, 10 feet telescope. A cluster of vS stars, there seems to be a faint milky nebulosity among them. 1784, 20 feet telescope, a most beautiful cluster of stars; not less than 200 in view."
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "cluster . . visible in finder."
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"cluster, fairly condensed."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
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.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 18' and the class as 2 2 r.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Burnham calls it a "remarkable, very bright, very large, very rich, compact group, some 15' in diameter, and containing 500 or more members, from the 10th to the 16th magnitudes. ... The brightest member is a 10th magnitude B9 star."
"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"open, almost circular." He gives the approx. diameter as 22 arcmin.
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 6.90.
Sanford notes that "to be resolved it requires binoculars, but to appreciate its magnificence, a 6- or 8-inch telescope is needed. It is elongated in an east-west direction and there is a prominent dark space in the middle near the eastern end.
The RNGC (Sulentic and Tifft 1973) notes that this is a 7.5 mag open cluster.
Hartung notes that "this really fine group of medium bright stars about 15' across is well differentiated from the field; it contains an orange star northfollowing and a red star following; both clear with 10.5cm. There is evidence of curviliner pattern."
Under good sky conditions, this open cluster in Cancer can be seen with the naked eye. It has the same angular size as the Moon, and Houston estimates it to be of magnitude 5.9. The French astronomer Flammarion likened the cluster to a sheaf of corn.
Houston writes: "This fairly rich open cluster contains about 160 stars brighter than ph.mag. 15.6 within an area 18' diameter. Most of the stars are faint, and the average magnitude of the five brightest stars are 11.6. The cluster has an irregular outline. Large binoculars will give about as pleasing a view as a 6-inch telescope. With a total visual mag of 6.1, this object might be visible when viewed in an extremely dark sky."
Phil Harrington (1990, Touring the Universe through Binoculars) notes that it "is often overlooked in favour of the more spectacular Beehive cluster. ... most glasses .. will see only the misty glow of stars too faint to resolve, but giant binoculars should also display a few points of light buried within."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "7M; 30' diameter; 200-plus 9M and dimmer members; whorls of stars remind one of a whirpool; high galactic latitude, distance, and age make this a most interesting cluster; reference: BCH-I-349."
Donald J. Ware:"This large open cluster is one of the oldest clusters known, at an age of about 10 billion years. It is about one-half degree in diameter, and is composed of well over 100 stars, although many of them are moderately faint. It is well detached from the background, and is moderately concentrated to the center."
Observer: Lew Gramer; Your skills: Intermediate (some years); Date/time of observation: 1998-03-10/11 01:00 UT; Location of site: Medford, MA, USA (Lat 42oN, Elev 5m); Site classification: Suburban; Sky darkness: 5.1 Limiting magnitude; Seeing: 5 1-10 Seeing Scale (10 best); Moon presence: None - moon not in sky; Instrument: 8" f/10 SCT on fork; Magnification: 90x, 170x; Filter(s): None; Object(s): M67
The ancient open cluster M67 was just a short RA-axis sweep due W of alpha Cnc. By far the brightest member of the cluster is a very striking mag. 8 yellowish star near the ENE edge. At 90x the other member stars, all much fainter, seem to be scattered pretty evenly around a 30' area. Some 50 could be counted with averted vision. Near the SW corner is a pretty trio of white and orangish mag. 9 stars. Just E of the trio is an intriguing "fuzz patch" - what seemed to be a multiple star just on the edge of resolution. At 170x, the count of stars in the slightly oblong cluster went up to 80, with somewhat concentrated in the N. The little "fuzz patch" SW resolves into a pretty clump of 4 or 5 faint stars, yet STILL embedded within a further haze: is this more unresolved stars, or a trick of the eye? At all powers, the cluster is somewhat elongated NE-SW.
Steve Coe, using a 13" f/5.6, notes: "Very bright, very large, extremely rich and somewhat compressed with stars from 10th to 14th magnitude. I counted 41 stars in the Northwest quadrant of M 67, which yields an estimate of 164 total stars at 135X. Going to 220X makes this excellant cluster fill the field of view with beautiful chains of stars and several lovely dark lanes that meander through the cluster like dusky rivers. The 11 X 80 finder will resolve the 8 brightest stars in M 67."
Observer: Steve Coe; Your skills: Advanced (many years); Date/time of observation: 25 April 98; Location of site: Sentinel Arizona USA (Lat +32, Elev 1500 ft); Site classification: Rural; Sky darkness: 7 1-10 Scale (10 best); Seeing: 6 1-10 Seeing Scale (10 best); Moon presence: None - moon not in sky; Instrument: 13" f/5.6 Newt; Magnification: 100X, 150X; Filter(s): none; Object(s): M 67; Category: Open cluster.
M 67 will show 3 stars resolved even in my 11X80 finder. Going to 100X in the 13" it is very bright, very large, very rich and somewhat compressed with 75 stars counted. There are several lovely delicate pairs along with the dense swarm of stars. This great cluster takes up about one third of the field at this power. Going up to 150X has me feel like I am seeing all that this cluster has to offer. There are about 120 stars resolved, I estimated that number by counting 30 stars in the NE quadrant. Several more of the beautiful delicate faint pairs are resolved, including one faint binary that is located dead center in the cluster. There is one dark marking on the NW side of M67. All in all, a grand cluster.
POSS: m7 * (ADS 7049) 18' from center.
Lick: f outliers to at least 1 deg.
Eggen & Racine: V or turnoff ~13.5, thus explaining 15cm lox appearance of
naked eye - marginal object. BS, 29Apr1992, TSP.
7x35mm - brtst *s res, a circ cloud w/wk concen. consp * at NE edge. m7-8 *
off N side. BS, 29Apr1992, TSP.
6cm - shaped like a cornucopia. 20 *s res @ 35x with much haze. CBL, Roof.
7cm - vnice mod br & vrich cl, well res even @ 20x. 30x shows *s a little
beyond m8 * NE edge, and exf hint of smooth haze out to m7 * due N.
50 *s @ 50x in main cl, but many @ threshold. BS, 15Apr1993, Anderson
15cm - avg size and mag but much richer than usual. a br * shines W of cl, m6.
15' diam w/50 *s brtr than m12. BS, 11Oct1970, FtL.
- nicely res @ 30x/50x. latter shows f outliers, while 30x doesn't. 50x
shows outliers to radius of m7 * 20' N. core 10'-12' across, has two doz
m10-12 *s on it w/many fntr. 140x, which shows V=15.0 *, shows 120-150
*s in core. many sm clumps and f pairs, esp sev on SW side. outliers all
f, reaching out to * N, which is here a very un= pair (ADS 7049, q.v.).
core oval, irreg bounded due to gaps among clumps. BS, 28Mar1989,
25cm - fantastic @ 45x, sim to M11 but not as bright. 20 *s of m9 w/a host of
fntr *s to m14. 25' diam.
30cm - looks like fiber-optic tree, with the trunk pointing SW. more suggestions
of strings than in actuality. 90 *s in 16' diam. tree crowned by m8 *.
(sketch in notes.) CBL, Roof.
Danie Cronje, observing with 10x50 binoculars, calls it "elongated in direction of (relatively) bright star. Appears almost like a galaxy with a bright central bar. Cannot resolve any stars."
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (95x, 218x)
This is a beautiful swam of various magnitude stars which is very rich in appearance. I try to look for the yellow star point, and do see a lot of them. Plenty star string like curly spring water, with here and there a few dark lanes. It looks like the western side is slightly broken down in star light. Fill my field of view. Notes: Old open cluster with similar stars to the Sun in age. Most of the stars seen at approximately their true color (the cluster is known to have many bright, blue stragglers and dense. Has an irregular outline that has stirred the imagination of many observers. A swarm of insects attracted to the golden light of a bright star.
12-inch Dobsonian f5 (EP: 20mm UW, 7mm UW)
Conditions: The fainter parts of the Milky Way are barely visible. Haziness only visible on the horizon. Atmosphere stable with little interference. Limiting Magnitude: 4.9.
Messier 67 is a bright irregular open cluster that is easy to observe. It is well-detached from the background and consists of about 50 bright and faint stars. In the centre of the cluster there are empty spaces, and also along the outskirts. Chains of bright stars can be seen in the central part. No coloured or double stars were noted, and there were no obvious prominent stars either.
Observing site: Little Tycho Observatory
[8h 50m 24s, 11� 49m 0s] Approximately 30 bright stars, the rest fainter. The cluster is lacking in doubles. .
Observing site: Little Tycho Observatory
[8h 50m 24s, 11� 49m 0s] A lovely cluster with only a few doubles. Half fills the 80x field.
Location: Bonnievale SSP (Night Sky Caravan Park)
Binoculars: Canon 12x36 IS (5-deg fov)
Sky conditions: Excellent (9/10)
Quality of observation: Good
Open cluster with four crab/octopus like 'legs' extending to east with an undefined head. About 43 stars. m = 7. size = 20-arcmin (25-arcmin cat).
The Messier objects
The Bennett objects
The Caldwell list
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