sponsored by psychohistorian.org
RA: 10h 14m 14.82s
Dec: +03° 27′ 59.1″
Ch: MSA:756, U2:234, SA:13
Type: galaxy (AGN LINER-type), Sb
Mag: B=11.9, V=?
Size: 4.677′ x 2.511′
Select a photo and click the button to view
This galaxy pairs with NGC 3166, lying north of Alpha Sex. It is of 11th magnitude and about 4' long.
Synonyms: H I-004
Discovered in December 1783 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB pL Resembling a telescopic comet. mbM."
A supernova erupted in this galaxy in 1984 (15.0v)
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads S,EL,MBM,DKLNS,NARMS DST ARM S OF DSK.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.5M; 4' x 1.5' extent; stellar nucleus; SP GAL N3166 is W-most of pair with SP GAL N3169 (11.4M; 4' x 2' extent); 9' separation between galaxies; EL GAL N3156 (12.5M; 2' x 1' extent) 45' to SW of N3166; has stellar core and 8M star nearby to E; all are !good supernova prospects!."
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty large, elongated 1.5 X 1 in PA 45 and much brighter in the middle at 100X."
Houston writes of a "pair of galaxies [NGC 3166 & NGC 3169] separated by only 8'. Both fit within the same field of a high-power eyepiece. At magnitude 10.6 and 5' long, NGC 3166 is easy. Its companion to the west, NGC 3169, is about the same size and brightness..."
Within range of a 6-inch, about 11th magnitude. Close to the west, a third fainter member of the group can be seen in a good 12-inch.
Observing site: Pinnacles overlook
[10h 14m 12s, 3° 28m 0s] Looks like an Sa (Burnham: Sb). Near 3166.
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.