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Type: galaxy (in cluster), Sbc
Mag: B=10.68, V=?
Size: 11.74′ x 3.63′
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Dunlop, J. (1828) A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere, Observed at Paramatta in New South Wales. Phil. Trans. Roy. Soc., 118, 113-151. [1828RSPT..118..113D]
James Dunlop observed it from Paramatta, New South Wales, and included it as No. 600 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "an extremely faint ill-defined nebula, rather elongated in the direction of the meridian, gradualy a little brighter towards the centre."
John Herschel recorded it as "bright, very large, very much elongated, 5' long; A fine and curious object. The following and brighter of two. In the ray is either a very faint star or a knot in the nebula." On a second occasion he called it "a bright ray; pretty suddenly much brighter in the middle; 4' long, the S.f. of two." On the next sweep he called it "pretty suddenly brighter in the middle, full 7' long, position 32.2 degrees." The second object mentioned is NGC 1531. In his comments on NGC 134, NGC 1532 and NGC 3109 he writes: "These figures exhibit elliptical nebulae normal in their character - that is to say, in which, as the condensation increases towards the middle, the ellipticity of the strata diminishes, or in which the interior and denser portions are obviously more nearly spherical than the exterior and rarer. A great number of such nebulae, of every variety of ellipticity and central condensation are figured in my Northern Catalogue. Regarding the spherical as only a particular case of the elliptical form, and a stellar nucleus as only the extreme stage of condensation, at least nine-tenths of the whole nebulous contents of the heavens will be found to belong to this class - so that, as regards a low and a structure, the induction which refers them as a class to the operation of similar causes, and assumes the prevalence within them of similar dynamical conditions, is most full and satisfactory. To abstain altogether from speculation as to what may be the nature of those causes and conditions, and to refuse all attempts to reconcile the phenomena of so large and so definite a class of cosmical existences with mechanical laws taken in their most general acceptation, would be to err on the side of excessive caution, and unphilosophical timidity. The time is clearly arrived for attempting to form some conception at least of the possibility of such a system being either held in a state of permanent equilibrium, or of progressing through a series of regular and normal changes, resulting either in periodical restorations of a former state, or in some final consummation."
B, 5'x1', spiral.
A supernova erupted in this galaxy in 1981 (13.5v).
Photo Index by Jim Lucyk: Sky&Tel. 6/88 p606, Deep Sky #5 Wi83 p20, Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p1.5.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads S,EL,MINC,BM,DKLNS DIF EXTENSIONS OFF PLANE.
Hartung notes that "this fine field with a few scattered stars contains two bright nebulae, one somewhat elliptical about 1' long and almost at a right angle to the immediately following long narrow spindle with round bright centre, and about 5' x 1' in pa 35 deg. Both objects are visible with 10.5cm."
Houston obsered this galaxy with 20x 5-inch binoculars as "one of a hard-to-see pair of galaxies in an easy-to-find field . . . several minutes were required to glimpse this 5' x 1' spiral, but then it was held steadily."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.8M; 5'x 1' extent; large slash with much brighter center; good supernova prospect; very small, faint EL GAL N1531 (13M; 0.5'x 0.3' extent) 1.6' to WNW."
04 12.1 -32 52
13: bright, large, pretty edge-on 5:1 SW-NE, very bright nucleus, thin
extensions. Forms a close pair with N1531 1.6' NW.
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty large, very elongated with a bright nucleus at 135X. This edge-on and the round NGC 1531 make an interesting pair."
SGC: pair of gxs 1'.7 apart.
15cm - seems in pa15, 2'.5x0'.5. sl brtr to cen.
- huge thin spindle @ 80x. 140x: 10'x1'.5 in pa35. reaches SE 2/3 way to V=10.2 * (T&B), NE as far as m14.5 * nr where shown on T&B chart. core approx circ, 45" across w/stlorng even concen. BS, 17Nov1993, LCO.
25cm - 3'x0'.5 in pa15. core boxy, 1'.25x0'.5, has grainy texture. 6' NW is suspected neb.
30cm - ah! beautiful pair w/-31, cf. long w/tapering and bulging core @ 140x. 220x shows it fully 6' long in pa30. the core is 1'.25 long and seems sl inclined to maj axis of halo, or about pa45. *ar nuc is not in center of core, but NW. pretty prominent dk lane runs across object on NW side making core sharply defined on that side. halo uneven w/in 2' of center: particularly there is a broad, sl condensed patch 0'.6 across about 1'.5 SW of center. sketch in notes. CBL, Sep1977, Roof.
Sutherland (Radar Dome Quarry)
8-inch f/6 Dobsonian
Conditions: Clear, dark.
Within the great eastward bend of Eridanus the River lie a host of galaxies. A personal favourite is the duo of NGC 1531 & NGC 1532, an easy star-hop from upsilon-4 Eridani. These distinct nebulae, within an obvious triangle of stars, are readily seen at 48x. The pair make a lovely contrasting grouping, floating in space. NGC 1532 is much elongated and grows brighter to the middle to a broad elongated nuclear patch.
Observing site: Fall Star Party
[4h 12m 6s, -32° 52' 0"] A very nice galaxy, elongated (1:5), with more of the halo south of the nucleus. Edge on Sc? B: Sb.
Instrument:12-Inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible.
Transparency Of the Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
This galaxy's spiral structure is seen edge on at a low magnification of both 57* and 75*.Around some of the areas of this galaxy there are areas lit up by the light of uneven areas of brightness.The nucleus of this galaxy has an elongated structure.From the nucleus of this galaxy the nucleus grows brighter compared to the far outskirts of this galaxy.
It measures 4.6'*0.9'with PA South West-to-North East.
The Messier objects
The Bennett objects
The Caldwell list
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