sponsored by psychohistorian.org
RA: 22h 02m 8.45s
Dec: −31° 59′ 29.5″
Con: Piscis Austrinus
Ch: MSA:1404, U2:383, SA:23
Type: galaxy, E
Mag: B=12.66, V=?
Size: 1.23′ x 1.047′
Select a photo and click the button to view
A 12th magnitude galaxy, about 1' across, in Pisces Austrinus. Part of a tight bunch of three galaxies, NGC 7173 & NGC 7174. A fourth, more prominent galaxy, NGC 7172, is part of the quartet.
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "vB, pL, sbM to a star, has a very faint star S.p.." On a second occassion he called it "B, R, mE, or rather distinctly binuclear, or a double nebula. Pos of the smaller about 250 degrees. Much brighter and better seen than last night. Not a doubt about the nature of the appendage." His third observation was recorded as "B, pS, R, double." The next record reads: "B, R, gpmbM, 40 arcseconds." The fifth record reads: "B, pL, R, smbM." The final record reads: "B, R, pgbM, 40 arcseconds."
A nebulous star attached at one end of NGC 7174. There are several other small and faint spindles in this region.
B, S, globular nebula, att.f.end of NGC 7174; exactly similar to NGC 7173. See HOB9.
Sandage (1975(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the NGC 7173 Quartet. Members include NGC 7173 and NGC 7176.
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads BDBW/7173,CONT.
William P. Clarke (San Diego, California, USA) writes in the The Webb Society Nebulae and Clusters Section Report No. 11, January 1993: "A group of four galaxies [NGC 7172, 7173, 7174 & NGC 7176] bunched together, the brightest being NGC 7172, which is the northernmost of the group. This object is extended E-W, with a bright nucleus. NGC 7173 is 3.4' south; it is nearly round and has a bright centre. NGC 7174 & 7176 are just S.f. NGC 7173; they are close enough together that their halos merge. Only the two bright nuclei allow them to be distinguished. (17.5-inch Newtonian, x227)"
15cm - in N7176 grp S of main trio. 10" diam, vf @ 80x/140x. m15 * on E? BS,
Instrument:12-inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible with the naked eye.
Transparency Of The Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
First Impression:This object looks like a galaxy.
Chart Number:No.19(Extract taken out of "Atlas of the Night Sky").
Size:26mm Eyepiece:Field Of View:57'/16= 3.5'.
20mm Eyepiece:Field Of View:50'/14= 3.5'.
3.5'+ 3.5'= 7'.
Size in Arc Minutes:3.5'.
Galaxy is 3.5'* 1.1'.
Brightness Profile:Right from the central outskirts of this galaxy the galactic nucleus grows slightly brighter.
Challenge Rating:Very Difficult.
This galaxy is well seen as a very faint smudge of light which has a roundish shape to it and its surface brightness is slightly brighter compared to NGC 5174.The galactic nucleus of this galaxy is centrally concentrated.All over this galaxy there are some areas of uneven brightness.This galaxy is well situated in a star poor region of 9th to 10th magnitude stars.
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.