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Full database:

Entire DOCdb database of 18,816 objects.



NGC 7421 (17,470 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 7421

NGC 7421, AM 2254-373, ESO 346-17, LEDA 70083, MCG-06-50-015, SGC 225406-3736.9, h 3964, GC 4865

RA: 22h 56m 54.33s
Dec: −37° 20′ 50.7″

Con: Grus
Ch: MSA:1423, U2:384, SA:23


(reference key)

Type: galaxy, Sbc

Mag: B=12.7, V=11.98

Size: 1.995′ x 1.737′
PA: 172°

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 "B, L, R, gpmbM, 20, resolvable with right eye, with left, barely resolved in the centre." On a second occassion he called it "B, L, R, gbM, 2.5 or 3'." His third observation was recorded as "pF, pL, vlE, vglbM, 50 arcseconds long."

Swift, Lewis (1896)

See Swift's comments on IC 5264

Published comments

Helwan Obs. Bulletin No 9 (1912)

F, 1.5' in diameter, spiral.

Helwan Obs. Bulletin No 22 (1921)

vF, 1.5' diam.m nearly R; very compact spiral with pretty large, faint nucleus; f.portion partly absorbed; See HOB9.

Shapley, H. & Paraskevopoulos, J.S. (1940)

Shapley, H. & Paraskevopoulos, J.S. (1940) Southern clusters and galaxies. Harvard Obs. Bull., No.914, 6-8.

de Vaucouleurs, G. (1956)

De Vaucouleurs (1956) "Survey of bright galaxies south of -35 declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm).

Shobbrook (1966)

(Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Grus Cluster has V = 12.18, B-V = 0.70 and U-B = 0.10. It measures 1.65 by 1.3.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads R,DIF,BM,SB STR SUSP.

Sandage (1975)

(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the IC 1459 Grus Group. Members include NGC 7410, NGC 7412, NGC 7418, NGC 7421, NGC 7424, NGC 7496, NGC 7531, NGC 7552, NGC 7582, NGC 7590, NGC 7599, IC 1459, IC 5267, IC 5269 & IC 5273.

Photo index

Photo Index by Jim Lucyk: Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p12.1.

Modern observations

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Faint, pretty large, little elongated 1.5 X 1 in PA 165, not brighter in the middle at 135X. This is a low surface brightness galaxy."

Brian Skiff

Canterbury: 19'.6 SSE of -18.

15cm - not vis. BS, Slate Mtn.

- mod f oval @ 80x. 140x: 2'x1'.5 elong NE-SW w/mod broad concen to occas vis *ar nuc. occas seems elong E-W in cen region w/narrow bar-like feature. BS, 15Nov1993, LCO.

25cm - 20' S of -18. circ, 1'.5 diam w/a sl cen condens. fairly empty 20' fld at 95x/190x. BS, Slate Mtn.

Contemporary observations

Magda Streicher

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (218x, 346x)

This whisper of light looks slightly elongated in a SW-NE direction. Does not look even but very much molted on its surface with high power. Can not detect a core.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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