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NGC 7723 (17,962 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 7723

NGC 7723, LEDA 72009, MCG-02-60-005, I 110, h 2261, GC 4998

RA: 23h 38m 56.6s
Dec: −12° 57′ 35″

Con: Aquarius
Ch: MSA:1328, U2:304, SA:17


(reference key)

Type: galaxy (in pair), SBb

Mag: B=11, V=?

Size: 3.311′ x 2.238′
PA: 35°

Historical observations

William Herschel (c.1784)

Synonyms: H I-110

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB, cL, lE, gmbM, iF."

NGC/IC Dreyer (1888, 1895, 1908)

This barred spiral galaxy was recorded by both Herschels, and is described as considerably bright, considerably large, elongated, gradually much brighter towards the middle with a mottled appearance.

Sir John notes that his father calls it "considerably bright" in two observations, whereas he himself has seen in as "extremely faint", adding "sky quite clear." Dreyer notes that "d'Arrest places it among the brighter nebulae of the second class", Schonfeld has "faint, diffused" and Lord Rosse has "pretty bright."

Published comments

Helwan Obs. Bulletin No 21 (1920)

pB, 3'x2', lE 40deg approx., B stell N.; a remarkably pretty little spiral.

Burnham's Celestial Handbook

Burnham gives it size as 3' x 2'.


A supernova erupted in this galaxy in 1975 (13.9v)

Sulentic & Tifft (1973)

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

Modern observations

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "extremely faint, small, roughly circular. Used averted vision to make out this elusive object, surface brightness is low. Located near a 5th mag field star. 6-inch, 43x."

Walter Scott Houston

Houston calls this a "small and formless 11th mag glow."

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12.1M; 3' x 2' extent; soft oblong with little brighter center; 20' to WSW is DBL ST ADS 16878 (33" separation @ PA 093; 5.7-9.6M); 40' to NNE is SP GAL N7727."

Brian Skiff

POSS: SB(rs)bII-III in pa45:. no br *s nrby as per 6cm obs.

6cm - just vis w/f * to N @ 35x.

15cm - lg mod br gx @ 80x. 140x: elong NE-SW, a broad 2'.5x1'.75 oval. reaches

halfway to m14 * 2'.5 SW. mod-strong broad concen in halo; vsm oval core

much brtr, and *ar nuc. occas sl mottled in halo. BS, 14Oct1990, Anderson


25cm - ill-def edges. defined core, perhaps *ar nuc. notches in edges of halo,

but no other detail. BS, Roof.

30cm - lox shows elong in pa60. oval, lo concen at hix, 3'x2' w/f *ar nuc

embedded in 1' oval, mottly core. CBL, Roof.

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