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RA: 12h 28m 10.96s
Dec: +44° 05′ 33.4″
Con: Canes Venatici
Ch: MSA:611, U2:75, SA:7
Type: galaxy (emission-line), I...
Mag: B=10, V=?
Size: 5.623′ x 3.715′
Synonyms: H I-213
Discovered in 1788 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "very brilliant, cL, E sp-nf, with difficulty resolved, has 3 or 4 bright nuclei."
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "oval, resolved. D'Arrest unequally double. E. of Rosse, 3 nuclei."
Burnham calls it a 10.5 mag irregular galaxy in Canes Venatici, measuring 4.2' x 3.0', which is very bright, considerably large, much elongated, and has a rectangular shape.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.5 mag galaxy. Their coded description reads IRR,HISB,DIFPERIPH VKNY.
Sandage, A. & Tammann, G. A. (1975) Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field. ApJ, 196, 313-328. [1975ApJ...196..313S]
Sandage and Tammann (1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the Canes Venatici I Cloud. Members include NGC 4136, NGC 4150, NGC 4214, NGC 4244, NGC 4248, NGC 4258, NGC 4395, NGC 4449, NGC 4736, NGC 4826 & IC 4182.
This galaxy appears on page 40 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
Schmidt K.-H., Priebe A. & Boller T. (1993) Nearby galaxies. Revised machine-readable version of the catalogue. Astron. Nachr., 314, 371. [1993AN....314..371S]
Other names: "U7592,07-26-009". Inclination: (face-on, in degrees) 45 Total photoelectric blue mag 9.99 Total colour index .41 Logarithm of the angular diameter D25 (arcminutes) 1.79 Blue photographic magnitude 10.10 This galaxy is included in a sample of galaxies with velocity less than 500km/s with respect to the centroid of the Local Group. [Nearby Galaxies. Schmidt K.-H., Priebe A., Boller T. (Astron. Nachr. 314, 371 (1993))]
Photo Index by Jim Lucyk: Sky&Tel. 12/86 p583, Burnhams V1 p380, Hubble Atl.of Gal. (Sandage 1961) p40, Deep Sky #22 Sp88 p13, Galaxies (Hodge,1986) p47, Observer's Guide (Astro Cards) 3-4/87 p17, Astronomy mag. 12/87 p22.
de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.
5. The nearer groups within 10 megaparsecs
G3. CVn I Cloud.
Brightest members: 4736, 4258, 4826, 4449, 4214.
A loose cloud of low-velocity objects may be isolated in the foreground of several more distant, overlapping groups and clouds in the UMa-CVn-Coma area. This whole region is described as the CVn cluster or M94 group by van den Bergh, who points out that many dwarfs are concentrated in this area; Sersic describes a subset as the UMa I group and another as the UMa II group (both of which, however, are all within the boundaries of CVn). ... After much searching and with some hesitation in borderline cases, the following objects were isolated as members of the foreground CVn I cloud (or restricted M94 group): NGC 4136, 4150, 4214, 4244, 4258, 4395, 4736, IC 4182, A1157 (=DDO 115) and possibly NGC 4826. Other possible dwarf members include DDO 99, 125, 126, 129, 133, 141, 143 and 156. All members are spirals of type Sb or later and Magellanic irregulars.
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.
"neb; elongated at 40°, 1.5' x 0.3'; B at centre; spiral?"
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
MacRobert calls this "a large irregular galaxy ... in the 6-inch it is a dim but easy patch of glow."
Randy Pakan of Edmonton, Alberta, Canada writes that "this galaxy takes power beautifully and has a wealth of detail" as he observed it with a 16-inch f/5 at 420x.
T&B: V=14.1 * sup nr center.
6cm - 28x: easy to find. broad brtning 2' diam.
7cm - about same brtness as N4490 just obs'd, but somewhat higher sfcbr. elong NE-SW @ 50x w/br velong core that is brtst roughly midway along SE-facing flank, where there is a sub*ar spot. seems broader at NE end, tapering SW. nice dbl * about 40' N. BS, 15Apr1993, Anderson Mesa.
15cm - br. 4'x3' and fairly reg in gradation and texture.
- detailed hisfcbr gx. oval 4'x2'.5 in pa45; lgr SW end, NE end tapered. center and SW end contains ridge of br spots and *ings, three of which consp: *ar one nr gx center, lgr fuzzy one to SW, fntr sub*ar one nr SW end. NE side of halo diffuse, rel losfcbr. `core ridge' narrow in proportion to halo. br spots hold up in UHC filter. BS, 20Mar1988, Anderson Mesa.
25cm - quite br. elong NE-SW. interesting br spots nr center in an elong core. averted vis shows arm curving NW from oval. 3'x1', good @ 120x.
30cm - elong, 6'x2'.5, fairly even [uniform] brtness. not much f halo. on NW is f blob extending from oval.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10.5M; 4.2' x 3' extent; bright, rectangular shape with brighter center; axis oriented NE-SW; higher-x shows detail near center; see photo at HAG-40; 45' to N, just 10' E of an 8M DBL ST, lies faint slash, SP GAL N4460 (12.5M; 3' x 1' extent); !good supernova prospects! DBL ST is Struve 1645 (10" separation @ PA 158; 7.4-8M)."
Observing site: Little Tycho Observatory
[12h 28m 12s, 44° 6m 0s] A faint brightening of the sky glow. I was suprised I saw this irregular at all!
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