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Type: galaxy, Sc
Mag: B=12.15, V=11.54
Size: 2.691′ x 1.047′
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 477 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "two very small roudn nebulae, nearly the same RA, and differing about 1' in polar distance." The other object is NGC 7599.
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, pmE, gbM, 90 arcseconds, the preceding of two."
pB, 2.25'x0.75', E 35deg, B alm.stell.N; rather compact spiral with indications of absorption.
Confirms HOB 22.
Galactic and Extragalactic Studies, III. Photographs of thirty southern nebulae and clusters. Proc. N.A.S., 26, 31-36.
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.
It forms part of the Grus Quartet (NGC 7552, NGC 7582, NGC 7590, NGC 7599)
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads B,EL,MINC,DIFPERIPH *CONT NF.
Shobbrook (1966, Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Grus Cluster has V = 11.58, B-V = 0.61 and U-B = 0.05. It measures 2.25 by 0.8.
Photo Index by Jim Lucyk: Ast.Obj.for South.Tel. (Hartung, 1984).
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).
Hartung notes: "This striking field contains in an area about 16' across three fairly bright spindles differently orientated, all visible with 10.5cm. In order of RA: 4'x1' pa 150 deg; 2' x 0.7' pa 45 deg; 4' x 2' pa 50 deg. The second is the brightest, and the third the faintest and most diffuse."
Steve Coe, observing with a 13" f/5.6, notes: "Pretty faint, pretty large, elongated 2 X 1 in PA 0, has an 11th mag star on northern tip at 100X."
15cm - second in Gru trio, mod br oval @ 80x w/m12.0 * nr NE tip. 140x: pa45
1'.7x1'.0 w/mod even concen. clumpy core, wk *ar nuc occas vis. m12 *
E of maj axis, gx extends sl past it NE. m15.5 * off NW of NE tip. BS,
30cm - smlr than -82, but sim in appearance. elong in pa40, 2'x0'.6. core oval
w/sev *ings embedded. vbr * embedded on SE side of NE end of halo.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This galaxy has a fairly long elongated shape which is seen at 75x and that the shape of this galaxy is well defined.The nucleus of this galaxy is slightly condensed in the center.There are some areas of uneven brightness around the outskirts of this galaxy while towards the outskirts of this galaxy.This galaxy measures 4'x 0.8'with PA SSW-to-NNE.Challenge Rating:Difficult.Chart:No. 143,NSOG Vol.3
The Messier objects
The Bennett objects
The Caldwell list
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