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RA: 06h 43m 12s
Dec: +26° 58′ 0″
Ch: MSA:154, U2:138, SA:5
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 22m
Mag: B=?, V=9.5
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Synonyms: H VI-021
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a very rich and very compressed cluster of stars of about 5' diameter, some of the largest stars are in a row."
Observations with the 72-inch f/8.8 speculum telescope at Birr Castle noted "Round; with rays."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 6' and the class as 1 2 r.
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.
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.
Photo Index by Jim Lucyk: Observer's Guide (Astro Cards) 11-12/88 p29, Burnhams V2 p942.
Houston notes that this open cluster is within reach of "modest amateur telescopes." He adds that the Webb Society's handbook for open and globular clusters notes that the central 2' of this cluster is very rich in faint stars, so it should handle magnification better than a sparse group."
Ken Reeves, in "SACNEWS On-line for February 1997", observing with a 10-inch f/4.5 scope, notes: NGC 2266 (06 43.2 +26 58) This open cluster is roughly triangular with a bright star at the apex on the southwest side. The object is pretty bright and pretty small with 18 stars counted over a very granular haze with the stars just on the threshold of resolution. I am looking forward to observing this object in better conditions and see how much of that haze resolves.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9.5M; 7' diameter; 40-plus 11M and dimmer members; far and faint; more populous than at first glance; few bright stars superimposed; 2 degrees due N of Epsilon GEM."
Listed by the Herschel Club, described as "30 stars counted, a tricky cluster, one bright star of 8th mag, most are faint and unresolvable, tightly packed and triangular in shape. 6-inch, 48x."
WDS: pair NNE = 0637.8+2740: 10.3,10.5; 4".8; pa273 (1947).
15cm - partially res @ 50x---a starry+hazy patch patch w/three brtr *s in an arc across S side. 140x: 5' diam w/30 *s res. mod concen. arc extends from m10 * on SSW clear across and out SE side: after first three stars is close, faint pair that has two distant comps S, and finally a close string of three (these latter grps are about m13). m13-14 pair nr center also. 35' NNE is close pair: 11,11.7; 5"; pa275. lies N of a m9 * BS, 7Nov1988, Anderson Mesa.
25cm - mod br, 4'-5' diam w/30 *s. distinguishing arc of *s starts on S w/m8 * and curves E fading to m12, w/seven *s inv.
- vnice, compact. 50 *s in 5' diam. on S are three br *s lining the obj.
30cm - nice cl w/string of six *s on S from SW to E. brtst * on SW. some uneven concen.
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty small, rich, somewhat compressed 50 stars counted at 165X. Several members are pretty bright."
NGC: 2266 - Gemini
RA: 06h43m19.0 - DEC: +26o58'10"
Magnitude: 9.5 – Size: 7'
Tel: 12" S/C – 218x – Date: 31 Jan 2008 – Site: Alldays - good
This is a story tell cluster. It contains various magnitude star given one the impression of a feathery hat. Brighter stars mark the rim from NE-SW with a handful of faint stars that spray out to the north running out in a faint string further north. Just beautiful.
Observing site: Little Tycho Observatory
[6h 43m 12s, 26° 58m 0s] Too faint for these skies.
Location:Blesfontein Guest Farm,Sutherland.
Sky Conditions:The most crystal 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.
This open cluster is arranged in the shape of a triangle and that I have noticed that this cluster consists of 13.4-13.6 magnitude stars whereby I have counted 45 stars within a fixed diameter.The stars in this open cluster are orientated in a NNE direction whereby in the center of this cluster there is an 8.7 magnitude star and that the stars in this cluster is well detached and most of the stars in this open cluster are nearly the same brightness as each other.This open cluster measures 8.2'x5.8'.Chart No.209,NSOG Vol.1.
The Messier objects
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