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RA: 07h 14m 30s
Dec: −10° 16′ 0″
Ch: MSA:297, U2:274, SA:12
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 33p
Mag: B=7.3, V=7.1
NGC 2353. See NGC 2351.
Synonyms: H VIII-034
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "an extensive cluster of scattered stars."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 20' and the class as 1 3 mU.
The RNGC (Sulentic and Tifft 1973) notes that this is a 5.0 mag open cluster.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"thin, irregular loose, bright stars." He gives the approx. diameter as 25 arcmin.
described as "some 25 stars counted, loose, one blue-white star, no definite shape, stands out well. 8-inch, 48x."
Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "7.5M; 15' diameter; large and sparse; 20-plus 10M and dimmer members with two brighter stars (7M and 8M) SW of center; just E of the Eagle (I.2177)."
Coe, observing with a 13" f/5.6, notes: "is pretty bright, pretty large, pretty rich and not compressed. It is a nice cluster at 135X, with about 50 members. The UHC filter will just barely show a very faint streamer of nebulosity on the south side. Rocking the scope helps to make the nebula more noticeable."
This is one of those open clusters that have one bright, primary star and a majority of much fainter stars. A 10-inch f/5 at 30x shows the stars in the cluster to be of 9th mag and fainter, excepting for the very bright (8th mag) primary. The cluster appears about a quarter of a degree across and has roughly 12 or so prominent members, with many more fainter companions. To the northeast of the brighter star is a very nice, almost equal, close double star. Due north of the cluster lies an orange 7th mag star.
On a second occassion, the 10-inch showed this cluster having a single 7th mag star, the other stars come in at 9 to 10th mag. It is irregularly shaped with approximately 20-30 stars easily seen. Almost due north lies an orange field star. The cluster appears to be divided into two parts; in the south a smaller box-shaped part containing the primary star and around it a half-circle loop of stars stretching from the east through north to the west. This band of stars appears broadest in the east and seems to narrow to a point in the west. The central portion appears essentially square and contains the primary star in the southern corner. South of this square the sky is barren and the cluster appears to end at the square.
The cluster (NGC 2353) also houses a dozen stars. The arrow-like shape brings to mind the typical small arrow one would find above a door indicating which way to go. Seven faint stars with a sharp point towards the south and brighter stars make up the image towards the north with a 10 magnitude double indicating the heart of the cluster. The brightest star is approximately 9 magnitude with a slight yellowish colour. However to the SW the star field is very busy including a long string from NW-SE which could be NGC 2351. Lovely cluster with various magnitude stars in a slightly elongated form NW-SE. The white 6Magntiude member dominates the SW part and also the more busy part of the cluster. It looks like it is been divided into two parts with a dark uneven lane from N to SE. However the western part with the indicated NGC 2351 is just a busy field and see Auke feedback below. The northern part of the cluster fade out in starlight to a bare field of view. Terugvoer Auke: NGC 2351 is 'n baie interresant geval; soos jou notas ook aandui, is daar 'n moontlikheid dat NGC 2351 (h437) = NGC 2353 (H VIII-34). Dit wil sę, nommer 437 in John Herschel (h) se katalogus, kan dieselfde wees as nommer VIII-34 in sy pa, William, (H) se katalogus. Die twee katalogus inskrywings is omtrent 'n graad uitmekaar.
Observing site: Little Tycho Observatory
[7h 14m 36s, -10° 18' 0"] A lovely starscape. The cluster itself is a loose grouping of doubles, with a 6mv B star on its southern border.
The Messier objects
The Bennett objects
The Caldwell list
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