sponsored by psychohistorian.org


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.


log in to manage your observing lists























Full database:

Entire DOCdb database of 18,816 objects.



NGC 1084 (1,974 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




finder chart

altitude today

altitude (year)


½°, , in DOCdb

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/yivumoo/public_html/show_object.php on line 167

Warning: fopen(/home/yivumoo/public_html/logs/showobject/20211018.txt): failed to open stream: Disk quota exceeded in /home/yivumoo/public_html/show_object.php on line 168

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 181

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/yivumoo/public_html/show_object.php on line 182

show browsing

NGC 1084

NGC 1084, AGC 420244, LEDA 10464, MCG-01-08-007, I 64, h 264, GC 604

RA: 02h 46m 0s
Dec: −07° 34′ 37″

Con: Eridanus
Ch: MSA:286, U2:265, SA:10


(reference key)

Type: galaxy, Sc

Mag: B=11.61, V=?

Size: 2.951′ x 1.698′
PA: 115°

Historical observations

William Herschel (c.1784)

Synonyms: H I-064

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB pL lE mbM."

Birr Castle/Lord Rosse

72-inch f/8.8 speculum telescope: "Nov 23, 1848. A curious object with dark spaces. Oct 10, 1850. Resolvable. Oct 16, 1855. Fine oval nebula, has nucleus, light mottled, sometimes I thought I saw a dark bay north of nucleus; certainly the ne. is brighter along the north and north-following side than in the part intervening between that and the nucleus. Dec 6, 1855. Previous suspicion as to direction and existence of dark streak confirmed; the nucleus and north edge of neb. both seem resolvable."

Lassell, W. (1866)

Bibcode: [1866MmRAS..36....1L]

Sketched and described.

NGC/IC Dreyer (1888, 1895, 1908)

This 12th magnitude spiral galaxy is described in the NGC as "very bright, pretty large, elongated, gradually pretty much brighter in the middle".

Webb, T.W. (1893)

In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "d'Arrest, 80x50 arcseconds. Not gaseous."

Published comments


A supernova erupted in this galaxy in 1963 (13.7b).

Photo index

by Jim Lucyk: Hubble Atl.of Gal. (Sandage 1961) p29.

Sulentic & Tifft (1973)

(Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads S,SLEL,HISB,BKNARMS TIW SPIRAL.

Sandage & Tammann (1975)

Sandage, A. & Tammann, G. A. (1975) Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field. ApJ, 196, 313-328. [1975ApJ...196..313S]

(1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the NGC 1068 Group. Members include NGC 936, NGC 1055, NGC 1068, NGC 1073, NGC 1084 & NGC 1087.

Sandage, A. (1961) The Hubble Atlas of Galaxies

This galaxy appears on page 29 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).

de Vaucouleurs, G. (1975)

de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.

Cetus I Cloud.

Includes NGC 1052 and NGC 1068 groups.

Brightest members: NGC 1068 ( B(0) = 9.81), NGC 936 ( B(0) =11.28 ), NGC 1084 ( B(0) = 11.38), NGC 1087 ( B(0) = 11.74), NGC 1055 ( B(0) = 11.77).

("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the Cetus I group are NGC 1068, NGC 936, NGC 1084, NGC 1087 & NGC 1055.

Modern observations

Tom Lorenzin

Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.1M; 2.1'x 1' extent; fairly bright oblong with brighter center; photo at HAG-29; cluster of 4 galaxies 1.5 degrees to WSW includes N1035, N1052, N1042 and N1048; all fit in 30' field."

Doig, P. (1925)

Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.

Ancient City Astron.Club (1980)

Described as "easily seen in a blank field, round with bright nucleus, fading a little towards the outer edges. 6-inch, 48x."

Steve Gottlieb

02 46.0 -07 35 17.5: very bright, fairly large, elongated 2:1 SSW-NNE, 2.5'x1.2', broad concentration with a large bright core. Irregular mottled appearance or dust or dark lanes on the E side. The west side has a symmetric bulging appearance but there are dark indentations or bays on the NE and SE sides of the halo (probably between the spiral arms).

8: bright, moderately large, elongated. Three mag 9-10 stars lie 13' N, 15' NNE and 16' NNW.

Walter Scott Houston

estimates the magnitude of this isolated galaxy as 10.8.

Steve Coe

Coe, observing with a 13" f/5.6, notes: "Easily seen at 100X, pretty bright, elongated and somewhat mottled at 180X."

Brian Skiff

Lick: pa40.

15cm - fairly br, circ, evenly illumin'd blob 1' diam.

25cm - curious. br w/hisfcbr in pa15, 1'.75x1'. halo seems in two parts: lg circ one w/sl fntr oval appendage in NE side, which is smlr. quite evenly concen w/o br cen. dk lane occas seen btwn parts.

30cm - easy @ 149x, pa40. broad core that is more def on NW side (dk lane). core oval, 1'.3x0'.8; halo 2'.5x1' overall. no *s nrby.

Contemporary observations

Auke Slotegraaf

1984 December 29

1984 December 29, 00:33-00:38. PRG, Stellenbosch.

Large! and bright. Elongated oval shape. One side (north-west from sketch) seems slightly brighter. Very few field stars.

Using a 15.5-inch telescope at 220x shows this large and bright galaxy as having an elongated oval shape, the northwestern side appearing slightly brighter. Very few field stars in field of view.

Tom Bryant

2011 1 4 20:14:0

Observing site: Little Bennett Regional Park

Telescope: C-11

[2h 46m 0s, -7 35' 0"] A large, elliptical blob. A tilted Sb? NE-SW. No pronounced nucleus. B: Sc.

Richard Ford

2012 December 16th, Sun


Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.

Instrument:12-inch Dobsonain.

This galaxy's shape is elongated and well defined with two long extensions which is seen at 57x and 75x.This galaxy's nucleus is centrally concentrated as a bright halo of soft light.Some areas of uneven brightness is observed around the far outskirts of this galaxy.No darker areas are noted around this galaxy.This galaxy measures 6.2'x 1.5'with PA NE-to-SW.Challenge Rating:Difficult.Chart:No.179,NSOG Vol.1

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

Object search

First search phrase


Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy cluster
asterism & stars

The Bug Report

DOCdb is still in beta-release.

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

> Bug Report


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

> Contact us


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.

Warning: Unknown: open(/tmp/sess_bcf34a3130fbc881862d975c59423fc3, O_RDWR) failed: Disk quota exceeded (122) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0