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RA: 22h 02m 6.82s
Dec: −31° 59′ 36.5″
Con: Piscis Austrinus
Ch: MSA:1404, U2:383, SA:23
Type: galaxies (interacting), Im
Mag: B=13.05, V=12.15
Size: 1.584′ x 0.758′
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A 12th magnitude galaxy, about 1' across, in Pisces Austrinus. Part of a tight bunch of three galaxies, NGC 7173 & NGC 7176. 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 "In sweep 493 this was taken for a vF star, but I now perceive it plainly to be a small faint round nebula."
pF, pS, mE 90deg, a curved spindle with nucleus.
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads E,R,BM.
pB, 70''x10'', E 85deg; spiral seen edgewise, alm.stell.N.; ? s.portion of nebula absorbed.
Gerd Bahr-Vollrath (Noosa Heads, Queensland, Australia) writes in the The Webb Society Nebulae and Clusters Section Report No. 11, January 1993: "[NGC 7172-3-4] A close trio of small, faint galaxies. All three appear as indistinct, faint glows. (8-inch f/12 SCT)"
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 - -76 is brtst of trio incl -73 & -74. -74 is *-like spot w/sm halo inv
w/-76 on its WSW side. -76 has vbr *ar nuc. the two gxs in common halo.
BS, 15Nov1993, LCO.
The Messier objects
The Bennett objects
The Caldwell list
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