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RA: 07h 36m 35s
Dec: −14° 28′ 57″
Ch: MSA:296, U2:274, SA:12
Ref: SIMBAD, Collinder (1931), DAML02, NGC/IC, Archinal&Hynes (2003)
Type: open cluster, 13m
Mag: B=4.42, V=4.4
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Synonyms: H VIII-038
Discovered on February 4, 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of pretty compressed large and small stars, round, above 15' diameter."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a very large, pretty rich splendid cluster, which more than fills the field. Place of the chief star a find double star."
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "grand broad group, visible to the naked eye, too large even for 64x; some brilliant 5 or 6th mag stars, including Struve 1121. About 2.5 degrees following is a group round, 4, 5th mag. A fiery red 5th mag leads the region."
Webb calls it "a grand broad group visible to the naked eye: too large even for 64X Some brilliant 5 or 6 mag stars including Struve 1121."
"! cluster, fairly condensed."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Remarks, p.217: "2422, 2437: these two fairly condensed clusters are situated a little more than one degree from each other. The former is composed of stars of different magnitude, many of them comparatively bright, the latter of comparatively faint stars, of more uniform, magnitude."
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
Journal BAA, 35, p159
open cluster, diam. about 40'; contains some B* mixed with fainter ones.
Doig, P. (1926) "A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"loose, irreg, with some bright stars." He gives the approx. diameter as 32 arcmin.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 30' and the class as 2 3 m.
"UBV sequences in five southern galactic clusters" [http://adsabs.harvard.edu/abs/1960ArA.....2..379L]
"Summary: Photoelectric sequences in the UBV system are determined for the galactic clusters NGC 2422, IC 2391, IC 2395, Tr 10, and NGC 3114 by means of the Rockefeller reflector of the Boyden Observatory in South Africa."
Burnham notes that this cluster used to be one of the missing Messier objects, "but the identification with NGC 2422 now seems definite."
Admiral Smyth described it as "a very splendid field of large and small stars dispersed somewhat in a lozenge shape and preceded by a 7 mag. with a companion about 20" N.f."
The RNGC (Sulentic and Tifft 1973) notes that this is a 4.5 mag open cluster.
Houston notes: "This fine open cluster is of the 5th magnitude and 25' in diameter. A coarse scattering of bright stars lies on a dim sheen of fainter ones, so a 10-inch is really needed to enjoy its splendor fully."
Listed by the Herschel Club, described as "a large cluster, very bright and rich, easily resolvable. 8-inch, 48x."
Houston wrote of it as "a coarse scattering of bright stars [which] lies on a dim sheen of fainter ones, so a 10-inch is really needed to enjoy its splendor fully." Two orange stars are known in the group, one near the South-West edge of the cluster, and another near the North-West edge. They have magnitudes of 7.8 and 7.9 respectively.
Harrington writes: "Scanning this galactic team [M46 & M47] will show just how different from one another open clusters can be. [M47] is a coarse grouping of about 30 suns ranging from 6th to 12th mag. A 6-inch scope can resolve nearly all of these stellar sapphires as they burn against a velvet black backdrop dusted with fainter gems. Adding a bit of colour is the orange variable star KQ Puppis one degree to the west."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "4.4M; 30' diameter; sparse (25-plus 6M and dimmer members); visible with naked eye; TERRIFIC! includes MTPL ST Struve 1121 (7-7.5M; 7.4" separation (A-B) @ PA 305); yellow-white pair; many other 8 thru 11M nearby stars are members of this gravitationally bound system; OPN CL N2423 (20' diameter; 60-plus 11 thru 13M members) 37' to N and a little E."
Steve Coe, observing with a 13" f/5.6, notes: "Very bright, very large, not compressed, scattered group with several bright stars of 8th magnitude and more to fill in the backround, 44 stars counted at 100X. This nice cluster is easy in the 11 X 80 finder, there are several stars resolved. Struve 1121 is a double star near the center of M-47, it is a mag 7/7.5 pair, sep 7", it is easily split at 100X."
Observer: Alan Shaffer (e-mail: email@example.com, web: http://www.geocities.com/CapeCanaveral/3693/) Instrument: 10-inch Schmidt-Cassegrain reflector Location: Rancho Palos Verdes, California, US Light pollution: moderate Transparency: good Seeing: good Time: Mon Mar 10 16:30:00 1997 UT Obs. no.: 97 Beautiful Open Cluster in Puppis. Very bright, rich field. About 40-50 stars set on the backdrop of the Milkyway. Very nice!
Observer: John Callender (e-mail: firstname.lastname@example.org, 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 05:10:00 1997 UT Obs. no.: 53 Bright, loose cluster of a dozen or so stars. Easily naked-eye visible
:"About the same size as M-46, this is another fine telescopic sight. This open cluster contains about 50 relatively bright stars moderately concentrated to the center."
Danie Cronje, observing with 10x50 binoculars, calls it a "splattering of bright stars, surrounded by glow from fainter stars. Contains a bright triangular grouping in centre of cluster. Cluster is large and very bright. Beautiful. In same binocular field as M46."
A 10-inch f/5 shows this nice cluster clearly resolved into large and small stars appearing over half a degree in size. The orange KQ Puppis lies one degree west. Near near the centre of the cluster lies a bright, easy, equal double star.
Sutherland (Ouberg Quarry)
11x80 tripod mounted binoculars
Conditions: NELM: fainter than 6.0 at the S.pole
Large, coarse cluster, consisting of three bright (6-7mag) stars and a further 15 down to 9th magnitude. Lies on a very rich field. In stark beautiful contrast to NGC 2437 (M46) one degree away. Used Uranometria chart 274 to locate it.
Telescope: Meade 8" - 18mm wide angle eyepiece.
A few bright stars sparkle beautifully together in an elongated south west formation. Exceptional bright member to the southwest with a few smaller stars clinging together and fainter loose stars surrounded the edges of this open cluster. About 8 to 10 stars.
Observer: Gerrit Penning; Date observed: 23/05/2004; Location: Boyden Observatory, Bloemfontein; Limiting Magnitude: 6; Transparency: Clean & Clear; Instrument Used: 80 mm adjustable magnification refractor ; Field of View: 40' (approx.) ; Magnif: 40x; General impression of object: A neat open cluster with a few distinctly bright stars scattered in field. Easily found with eye and binocular.; Rating: 7/10; General impression of its surrounding area: Due to O/cluster M46 nearby, it is a splendid area of the sky in Puppis for especially binocular use.; Description of object:
[Telescope]: M47 appeared as a bright, though sparsely populated and large open cluster. Evident in the centre was a crux-like pattern of stars, with another bright star to the north-east. Fainter stars are scattered around this cross. It seemed compact with no specific star strings moving out of the cluster.
[Binocular]: (12x50) - Easily visible with the binocular, the cross pattern and north-eastern bright star are discernable and seems to form an "A" like structure skewed to the north.
Remarks: The observation was done under good viewing conditions and done with adequate concentration, also with enough time on hand. Due to brightness of the cluster's stars, the moon and slight light pollution did not interfere to an unfavourable degree. The object should still be visible in the worst polluted environment! A detailed sketch could be made.
2008 February 27, 20:45
Walmer, Port Elizabeth
2.5-inch f/7.6 refractor (EP: 12.5mm 56x 30arcmin fov)
Conditions: Clear, moderately stable.
Size=30arcmin, V=4.5. Very bright, with many coarse stars scattered throughout. Two bright prominent stars HD 61224 in the east M7.6, slightly brighter one in the west M7.5. Coarse stars range M8.6-M9.5 with a small group toward the centre M9.0-10. Cluster is well spaced with dark starless patches. A chain of slightly dimmer stars M7.9-8.1 stretches north-south. There are few field stars in the area; 28arcmin W two bright field stars M7.1 HD 60414 and northwest M7.4 HD 60325. 15arcmin south a group of eight field stars M7.3-M9.5. NGC 2422 was fairly easy to find. (Second report) Size=30arcmin, V=4.5. Quite a bright cluster, with a fair amount of coarse stars scattered throughout the cluster. Two bright prominent stars HD 61224 M7.6 and 7.5 in the eastern portion of the cluster. Coarse stars range from M8.6-M11 scattered throughout, except for a small grouping near the centre M9 to M10. A chain of coarse stars M7.9-8.1 stretches from north to south. NGC 2422 is well spaced, with dark starless patches. A few field stars within close proximity: 28arcmin two bright field stars west M7.1 HD 60414, and north-west M7.4 HD 60325. 15arcmin south a group of eight field stars M7.3-9.8. NGC 2422 was fairly easy to find.
12-inch f5 (EP: 26mm SW, 20mm UW, 7mm UW)
Conditions: The most clear sky possible. Dark moon and stars magnitude 6 and fainter are visible with the naked eye. Excellent clean sky, limited star flickering and brilliant objects. Limiting Magnitude: 6.2.
Open cluster located in Puppis. Very Bright. Irregular and well grouped as a very large open cluster. By making use of my 20mm ultra wide angle eyepiece this cluster is bedridden with plenty of bright stars that it almost fills the field of view of this cluster. Well detached from surrounding. 55 stars within a fixed diameter. Bright and faint stars mixed, slightly concentrated. On the outskirts of this cluster there are slightly starless patches. Prominent individual stars of 1st magnitude are noted. The stars have a whitish colour to yellow-white.
Observing site: Little Tycho Observatory
[7h 36m 36s, -14° 30' 0"] A sparse, but bright open cluster containing the exquisite double Struve 1121.
The Messier objects
The Bennett objects
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