sponsored by psychohistorian.org

DOCdb

Deep Sky Observer's Companion – the online database

 

Welcome, guest!

If you've already registered, please log in,

or register an observer profile for added functionality.

List:

log in to manage your observing lists

 browse:

 

 position:

 

 next:

 

 options:

summary

rename

prune

trim

remove

close

copy

combine

plan

bookmark

load

new

delete

marathon

favourite!

Full database:

Entire DOCdb database of 18,816 objects.

 browse:

 position:

NGC 7421 (17,470 of 18,816)

 next:

oc gc pln bn dn gx gxcl ast aka lost

Object:

list

bookmark

finder chart

altitude today

altitude (year)

 search:

½°, , in DOCdb

show browsing

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

Ref: SIMBAD

(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

Named DSOs

Object search

First search phrase

    and

Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy
galaxy cluster
asterism & stars
unverified/lost
nova

The Bug Report

DOCdb is still in beta-release.

Known issues, feature requests, and updates on bug fixes, are here:

> Bug Report

Feedback

Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!

> Contact us

Help!

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.

> Find out 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.