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RA: 10h 37m 18.7s
Dec: −58° 39′ 36″
Ch: MSA:992, U2:427, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, NGC/IC, Archinal&Hynes (2003), [2003A&A...399..141M]
Type: open cluster, 13rn
Mag: B=6.91, V=6.7
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NGC 3324. See IC 2599, the southern part of the NGC object.
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 322 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "A star of the 7th magnitude, involved in faint nebula."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "A double star involved in nebula, which is one of the outliers of the great nebula about Eta Argus. It extends to a star 6.7 mag half a field distant southwards, and almost as far north; pretty bright; irregular figure; fine object."
The NGC records it as "pretty bright, very very large, irregular figure, double star involved."
Ced 108 (NGC 3324)
Position (1900): RA 10 33.6, Dec - 58 6
Star: -57 3584 (Mp=7.7:, V=8.39, SpT=Oe5)
Spectrum of nebula: emission spectrum (inferred from sp.t. of exciting star)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope with conspicuous structure (eg. IC 5146)
Notes: "NGC 3324 = GC 2167 = h 3286 = Dunlop 322. R. These designations probably refer to the double cluster, the northern part of which has been separately catalogued as IC 2599. The neighhouring cluster NGC 3293 should be searched for nebulosity. (30, 561). CPD -57 3584 = HD 92206 = Boss 14621. Alternative Class: A. 1."
Burnham calls it "pretty bright, very large, 15' diameter with 8th magnitude star spectral type O5e."
A Preliminary Survey of Nebulosities and Associated B-Stars in Carina.
Area D, p43.
"nebula, rather F, one rather B* involved, a portion of the Great Nebula in Carina"
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Moffat, AFJ & Vogt. N. (1975) "Southern Open Star Clusters V. UBV-H-beta Photometry of 20 Clusters in Carina.." Astron.Astrophys.Suppl., 20, 125-153. [image, table]
"All but star no 12 belong to a clear sequence of O and B stars from which .. d =3.28 kpc .. the cluster's low age is also supported by the presence of strong HII emission (part of RCW 53) mainly confined within a filamentary elliptical-shaped arc of semi-major axis 5.5'."
They list 12 stars with V 8.22 to 14.00.
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.
The entry relating to IC 2599 was contributed by Pickering and is described as "a star 8.5 mag in nebula, NGC 3324 following 6 seconds, 6' south." These two references are regarded as being to the same object.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
Gum, C.S. (1955) A survey of southern HII regions. Mem.RAS, 67. [1955MmRAS..67..155G]
Colin S. GumA Survey of Southern H II Regions published in the RAS Memoirs, Vol. LXVII, identifies his No. 31 with NGC 3324 and IC 2599. Gum's Notes for this object read: "An outer condensation of the large nebula Stromlo 33 in Carina. On a photograph by Thackeray with the 74-inch reflector at Pretoria it is seen to contain a bright semi-circular rim which suggests Class IV structure on a small scale, although the nature of the rim appears to be different from other objects of Class IV as recorded on small scale plates in the present work." Indeed, Gum's photographs were small; they were taken through a f/1 Schmidt camera of 10cm aperture and recorded on 22mm diameter disks of film punched from 35mm roll film. This gave a field width of 11 degrees with a focal plane scale of 35' per mm. In his scheme of classifying the large-scale structural features of nebulae, the nebula is rated a "IV", which corresponds to "fainter objects in which the emission is concentrated in a ring or in a incomplete ring." He gives the size of the nebula as 20', and the intensity, or "visibility in the particular section of the Milky Way in which the object occurs" is rated as "bright" on a scale of vf - f - mb - b - vb. The exciting star is given as the 7.7 mag B-type HD 92206. He notes that it corresponds to No. 108 in Sven Cederblad's 1946 catalogue. The catalogue of Rodgers, Campbell and Whiteoak includes it in their No. 53, which is their designation for the main Eta Carinae complex.
Hartung writes of it as "an extensive nebulous haze without much concentration, fairly bright but very irregular and only well-defined on the edge N.p.; it lies in a very rich starfield and is more marked round the small pair h4338 (8.4 99.5 6" 90 ) ... 6-inch will show the brighter regions of the nebula."
Claria: cen pair = HD 92206AB: V=8.21/0.13, 9.16/0.17. comps to brtst *:
V=11.70/0.21 (NW), V=12.23/0.25 (WSW, is dbl). comps of * SW:
V=9.05/0.15 (brtst), V=11.38/0.09 (W), V=13.42/0.30 (ENE), V=13.97/
0.33 (S). * W edge: V=9.28/0.12; * NE edge: V=8.93/-0.01. br * S:
V=5.46/0.50, lies 7'.1 S of br * in center of cl. m11-13 *s ~7'.4
15cm - lg br emission neb around mult *. 140x: most nrly cen * is nice pair with
two vf comps NW & SW. next brtst * SW also has comps. UHC & [OIII] vgood
for 80x. neb @ 80x w/assorted filts: sharp edged on NWrn third, from m11
* at SW edge around to due N of brtr pairs. rather dim by the time the
circle reaches NE quad nr another m11 *. Ern boundary indented, so that
it's not vis vfar E of the brtst pair. emission neb reaches halfway to br
* S and halfway to clump of m12-14 *s NW. neb around br * S is reflec: DS
improves it, others kill it. it is circ and contacts emission neb N.
about a doz *s other than those mentioned are scattered w/in neb. BS,
Sanford describes it as "a fairly bright cloud situated in a rich star field, and is at its brightest near an 8th magnitude Otype star."
1994-01-24, Die Boord, 11x80's. Strong moonlight. I see here a star of about 8th magnitude, which appears fuzzy. Close inspection reveals a fainter companion due west. Whether the fuzzy appearance is due to additional faint stars in the cluster is uncertain. It is doubtful if the fuzziness was nebulosty, considering the aperture and observing conditions.
2008 April 14, 20:00
Walmer, Port Elizabeth
2.5-inch f/7.6 refractor (EP: 12.5mm 56x 30arcmin fov)
Conditions: Windy, unstable, Moon highly obscuring.
V=6.7, size=6arcmin. Very faint, five stars including a bright slightly separated star M6.1. NGC 3324 has moderate surface brightness. Central region can be resolved into two stars M8 and 8.9, bordered by two equally bright stars M9.6, one in the west and the other in the northeast from the central region. Cluster is well spaced for a small cluster with the resultant dark gaps. Averted vision is important for observation of the cluster. The cluster is well placed in a rich starfield: southeast M6.3 18arcmin a bright field star. Many field stars south 32arcmin M5.7-7. NGC 3324 doesn't contain many stars and forms a half-bowl asterism.
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.
First Impression:This object looks like a small cloud of gas and dust.
Chart Number:No.32(Extract taken out of "Star Gazer's Deep Space Atlas").
Size:26mm Super Wide Field Eyepiece:Field Of View:57'/3=19'.
20mm Ultra Wide Angle Eyepiece:Field Of View:50'/2.5=20'.
19'+ 20'= 39'.
Size in Arc Minutes:19.5'.
Nebula is 19.5'* 6.5'.
Brightness Profile:Towards the central outskirts of this nebula it grows slightly brighter than the open cluster.
Challenge Rating:Very Easy.
In this nebula I have found nebulosity surrounding the field stars in this open cluster.This open cluster is lit up by this nebula in which the stars have just started to shine.Around this nebula some dark patches are observed.
The Messier objects
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