sponsored by psychohistorian.org
RA: 23h 16m 11s
Dec: −42° 34′ 59″
Ch: MSA:1444, U2:415, SA:23
Ref: SIMBAD, Corwin
Type: galaxy (HII), SBbc
Mag: B=11.4, V=10.71
Size: 3.548′ x 2.344′
NGC 7552 = IC 5294, which see.
It forms part of the Grus Quartet (NGC 7552, NGC 7582, NGC 7590, NGC 7599)
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 475 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a small faint nebula, rather elongated in the parallel of the equator, about 30 arcseconds broad, and 40 arcseconds long; there is a pretty bright point situated near the centre of the nebula: a small star precedes it."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "B, S, mE, nearly in parallel; vsbM to a star 13m."
! pB 3' diam., vB sharp stell.N; irr. psi-type spiral; the cross-arm is in PA 90deg and is mb at each end than near the middle, where a curious faint circle occurs of diam. 50''; the outer circle of the psi is extremely faint except the s.f. portion.
Confirms HOB 22.
"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). In the notes: "IC 5294 in same object."
Paturel, G., Petit, C., Kogoshvili, N. et al. (1991) An extragalactic data base. IV. Errors and misprints in catalogues of galaxies. Astrophys.J.Suppl.Ser., 91(3), 371.
NGC 7552 = IC 5294
(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.
(Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads SB,BBAR,DIFPERIPH N ARM NOTVISIBLE.
, Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Grus Cluster has V = 10.92, B-V = 0.72 and U-B = 0.13. It measures 2.6 by 1.8.
This galaxy is listed in the "Third Reference Catalogue of Bright Galaxies" as having an outer ring of 3.13 arcminute diameter.
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.
Possible foreground object: IC 5332 (in Sculptor group?)
Brightest members: NGC 7552 ( B(0) = 11.44), NGC 7424 ( B(0) = 11.46), NGC 7410 ( B(0) = 11.61), IC 5267 ( B(0) = 11.65), NGC 7582 ( B(0) = 11.84).
Hartung notes: "it is fairly bright and lenticular, about 2.2' x 0.8' in pa 90 deg, with a small concentrated nucleus and two stars near south and west. 10.5cm shows only the nucleus and some faint haze but 15cm elongates it."
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty large, much brighter in the middle, and much elongated (2.5 X 1) in PA 90 at 100X. Raising the power to 165X will show off a bright, stellar nucleus in moments of good seeing."
photo: *-like obj nr nuc is vbr set of HII regions, not * or SN.
Canterbury: * ~3' S; no * 1'.7 S. pa100.
15cm - mod br gx w/exbr *ar nuc @ 80x. 140x: nuc seen @ 80xis prob m13 * sup
just WSW of geometric center. halo 1'.7x0'.6 in pa90, extending 1/2way
to m13.5 * W. m15 * w/in halo on ENE flank. BS, 14Nov1993, LCO.
30cm - smoothly brtning except for *ar nuc, which has vsm spot around it,
perhaps 10" across. 2' diam w/circ halo, core seems elong in p100. 220x
destroys halo, goves core pa100, and br nuc. 1'.3x0'.9. m13 * 5' S.
Sky Conditions:The fainter parts of the Milky Way are barely visible on the horizon.Atmosphere stable with little interference.
This galaxy has an elongated shape with extensions being seen almost edge on.There are a few areas of some uneven brightness seen on the far outskirts of this galaxy.The nucleus of this galaxy is vaguely condensed and that the nucleus of this galaxy grows slightly brighter compared to the far outskirts of this galaxy.There are some darker areas within the outskirts of this galaxy.This galaxy measures 5'x1'with PA West-to-East.Challenge Rating:Difficult.Chart:No.143,NSOG Vol.3
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
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.
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.