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RA: 12h 16m 11.7s
Dec: +47° 52′ 57.7″
Con: Canes Venatici
Ch: MSA:592, U2:74, SA:7
Type: galaxy, Sa
Mag: B=12.4, V=?
Size: 3.801′ x 1.548′
Synonyms: H I-209
Discovered in 1788 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB, cL, E, mbM."
Burnham calls it a 12.3 mag spiral galaxy in Canes Venatici, measuring 2.5' x 0.6', which is considerably bright, pretty large, pretty much elongated, pretty suddenly brighter in the middle, lens-shaped.
A supernova erupted in this galaxy in 1983 (14.5p)
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads DIF,SPN,BM.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12.3M; 2.5' x 0.5' extent; soft, NW-SE-oriented slash with brighter center; 8M star 15' due N; good supernova prospect."
15cm - 3'x1', a dull, uniformly br patch. vis in dk sky only.
25cm - elong SE-NW, 2'.5x0'.75. m12 *ar nuc. curious extns from core perpendic
to maj axis suspected. mod f.
30cm - pa130, 2'.5x0'.8 @ 220x. bulging middle: lentic form. mod broad concen w/
elong inner regions. a f circ non*ar nuc can be seen only w/averted vis.
concen part seems to lie closer to SW side.
12-inch f/10 SCT (95x/52.8′, 218x/23.1′)
This galaxy could be just be a miniature of M106 as seen with 12" S/C – 95x. Soft, small smear of light in a NW-SE direction. Slowly brightens to a slightly brighter nucleus 12" S/C 218x. It also corresponds with the size of 4' in length towards my field of view 23.1 FOV.
The Messier objects
The Bennett objects
The Caldwell list
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