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NGC 7172 (16,986 of 18,816)

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NGC 7172

NGC 7172, ESO 466-38, HCG 90a, LEDA 67874, MCG-05-52-007, SGC 215907-3206.6, h 3908, GC 4729

RA: 22h 02m 1.7s
Dec: −31° 52′ 18″

Con: Piscis Austrinus
Ch: MSA:1404, U2:383, SA:23

Ref: SIMBAD

(reference key)

Type: galaxy (Seyfert 2), S0:

Mag: B=12.82, V=11.9

Size: 2.238′ x 1.348′
PA: 100°

Remarks

The brightest of a quartet of galaxies in Pisces Austrinus. It is about 2' across, and about 12th magnitude. Other cluster members tightly bunched are NGC 7173-7174-7176

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, pL, gbM. The first of a group of four. See fig 11, Plate IV." On a second occassion he called it "pB, E." His third observation was recorded as "pB, R, 40 arcseconds." The final record reads: "F, pL, lE, gbM."

Published comments

Helwan Obs. Bulletin No 9 (1912)

F, pS, vmE 90deg, spindle with nucleus and a dark rift.

Steve Coe, in "SACNEWS On-line for October 1996" notes: NGC 7172 Pretty faint, pretty small, elongated 2x1. There are two other pretty faint galaxies in the field and one very faint galaxy that I can only see with my head covered by a dark cloth. One of the other galaxies in this field is NGC 7174, it is pretty faint, small and round at 165X. Another is NGC 7176 it is faint, small and round with low surface brightness. Save this grouping for a dark site and a clear night. The position for NGC 7172 is 22 hr 02 min and -31 52.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads EL,BM,DKLN CT.

Photo index

Photo Index by Jim Lucyk: Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p14.2.

Helwan Obs. Bulletin No 22 (1921)

pF, 2'x1', E 100deg; spiral with lng dark rift n. of an alm.stell.N.; no whorls visible. See HOB9.

Modern observations

Bahr-Vollrath, Gerd (1993)

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)"

Clarke, W.P. (1993)

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)"

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Pretty faint, pretty small, elongated 2x1. There are two other pretty faint galaxies in the field and one very faint galaxy that I can only see with my head covered by a dark cloth. One of the other galaxies in this field is NGC 7174, it is pretty faint, small and round at 165X. Another is NGC 7176 it is faint, small and round with low surface brightness. Save this grouping for a dark site and a clear night."

Brian Skiff

15cm - mod f gx in -76 grp. oval elong E-W, 1'.2x0'.8 halo vf. mod broad concen

except for vf *ar nuc. BS, 15Nov1993, LCO.

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