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Type: bright nebula
Mag: B=?, V=?
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NGC 3586. See NGC 3576.
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "small, oval, elonated in pos approx. 160 ; the last of a group of six." and also as "extremely faint, oval." Herschel notes that "in the first obs only 5 were noticed. In the other a 6th was seen and laid down." These six are NGC 3576, 3579, 3581, 3582, 3584 and 3586.
Recorded in "Observations of the Southern Nebulae made with the Great Melbourne Telescope".
See the discussion of Lithograph M.4.35 for the details.
Region around Eta Argo. Union Obs. Circ., No 18, 123-125.
Ced 113f (NGC 3586)
Position (1900): RA 11 8.2, Dec - 60 49
Spectrum of nebula: (not classified)
Classification: Nebulous cluster (Patches of neb adhering to individual stars of the cluster, eg. Pleiades)
Size: (not given)
Notes: "Ced 113 A nebulous field discovered by John Herschel in 1834 and catalogued as follows. Ced 113 f = NGC 3586 = GC 2342 = h 3330."
A Preliminary Survey of Nebulosities and Associated B-Stars in Carina.
Gum, C.S. (1955) A survey of southern HII regions. Mem.RAS, 67. [1955MmRAS..67..155G]
A Survey of Southern H II Regions published in the RAS Memoirs, Vol. LXVII, identifies his No. 38a with this grouping. Gum 38b is NGC 3603, and he writes: "Two objects linked together with nebulosity (overall dimensions 45' x 15'). Each is of complex structure." For his 38a grouping, he gives the size as 20' x 15' and identifies the group with No. 113 in Sven Cederblad's 1946 catalogue.
The combined grouping of Gum 38a + b are also known as RCW 57, which is commented with "Appears obscuration-bounded and contains bright crescent shaped region 50' x 20'."
(Sulentic and Tifft 1973) notes that this is a diffuse nebula.
The Messier objects
The Bennett objects
The Caldwell list
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