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NGC 5728 (12,611 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 5728

NGC 5728, AGC 540121, LEDA 52521, MCG-03-37-005, SGC 143937-1702.4, I 184, h 1866, GC 3977

RA: 14h 42m 23.9s
Dec: −17° 15′ 11″

Con: Libra
Ch: MSA:838, U2:333, SA:14


(reference key)

Type: galaxy (Seyfert 2), SBb

Mag: B=12.37, V=?

Size: 3.162′ x 1.905′
PA: 0°

Historical observations

William Herschel (c.1784)

Synonyms: H I-184

Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB, pL, E sp-nf, mbM." The Notes to the Second Catalogue reads: "Suspected of variability by h. H. has only this one obs."

John Herschel

Sir John Herschel notes: "Some suspicion of variability, inasmuch as one description calls it Round, another Elongated, and another Much Elongated, besides other indications in respect of brightness"


This galaxy was recorded by both Herschels, and described as pretty faint, pretty large, pretty much elongated approximately at position angle 45 degrees, much brighter in the middle, with a 10th mag star to its South.

Published comments

Helwan Obs. Bulletin No 15 (1915)

pF, pL, mE 35deg, BN, spiral.

Knox Shaw, H. (1915)

Knox Shaw, H. (1915) Note on the nebulae and star clusters shown on the Franklin-Adams plates. M.N.R.A.S., 76(2), 105-107.

Comments on papers by Harding (MNRAS, 74(8)), and Melotte (MemRAS 60(5)) describing objects foundon the Franklin-Adams plates; compares with plates taken with the Reynolds reflector (Helwan Obs Bull. 9-15):

NGC 5728 is an elongated spiral. [previously included in Class II-Spindle-shaped Nebulae]

Helwan Obs. Bulletin No 22 (1921)

pF, 2'x1', E 35deg; spiral with pB alm.stell.N. See HOB 15.

Sulentic & Tifft (1973)

(Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads EL,BM,DIF,SSTRSUSP *CLOSE NF NUC.


de Vaucouleurs, G. et al. (1991) Third Ref. Cat. of Bright Galaxies (RC3)

This galaxy is listed in the "Third Reference Catalogue of Bright Galaxies" as having an outer ring of 3.00 arcminute diameter.

Contemporary observations

Magda Streicher

2010 April 14

Location: Polokwane

16-inch f/10 SCT (127x 290x 462x)

What a lovely sliver of light quite outstanding apart from its indicated magnitude 12. The nucleus brightens to a bright pin-point image. A faint star just north of the nucleus given it a double impression.

29 April 2009


RA: 14h42m24s - DEC: -17o15'10" - Magnitude: 12 - Size: 3.2'x1.9'

Tel: 16" S/C - 290x - 462x - Date: 29 April 2009 Polokwane Vis 5.2+-

An outstanding spindle galaxy in a definite elongated shape from north to south. It is just barely brighter towards the middle area. The northern tip of the galaxy seems somewhat more pointy and hazy.

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