sponsored by psychohistorian.org
Synonyms: H I-142, II-39
Observed on 23 February 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pretty bright, contains two stars in the middle." It was entered as II-39 in the Catalogue, to which Dreyer adds: "Sweep 158, February 23, 1784. 'A pB. neb., it contains two stars in the centre and is preceded by a small star..' Neither H. nor h. nor d'Arrest saw more than one nebula here, it is therefore = I-142..." On April 30, 1786 he logged I.142 as "cB, pL, iR, gmbM."
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads R,VDIF,SBO),SMBM-BAR SEV* SUP IN HALO.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.8M; 3' x 2' extent; oblong splotch with much brighter center; !good supernova prospect!."
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty large, much brighter middle with an almost stellar nucleus, little elongated 1.2 X 1 in PA 0. There is a 10th mag star to the SW."
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.