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RA: 06h 32m 41.3s
Dec: +10° 09′ 34″
Ch: MSA:203, U2:182, SA:12
Type: reflection nebula
Mag: B=11, V=?
Size: 5′ x 3′
Synonyms: H IV-003
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pB, much like a star with an electrical brush."
The Earl of Rosse, observing with a 72-inch f/8.8 speculum telescope, recorded this object 15 times. He noted "Sketched three times. Small star near a large one; the large star following the nebula has a companion; this, NGC 2245, is an enormous nebulosity, which I traced following and north of it to a great distance, some degrees. It narrow at times to a band across the finding-eyepiece of about 6' or 8'. I fancied the number of large stars was greater in it that in the neighbourhood; I am certain the number of small stars is much less. In a small space, taken at random in its neighbourhood, I reckoned upwards of 20 small stars. In a similar space in it, taken at random, but 3."
"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"star and diffuse cometic nebula." He gives the approx. diameter as 5 x 3 arcmin.
Ced 80 (NGC 2245)
Position (1900): RA 6 27.2, Dec + 10 14
Star: Anon (Mp=11.2, V=10.8, SpT=B1p)
Spectrum of nebula: continuous spectrum (observed)
Classification: Neb associated with mainly one star (which may be multiple) - Fan-shaped object (eg. IC 59)
Notes: "NGC 2245 = GC 1425 = h 393 = H IV 3. Disc. 1784. FA 122. WP 30. (64, 88 Pl 28, 114, 174, 209, 216, 232, 252, 366, 482, 486, 550, 578, 631, 686, 687, 715, 791)."
Lynds, B.T. (1962) Catalogue of dark nebulae. Astrophys.J.Suppl.Ser. 7, 1-52. [also: computer datafile: VII/7A]
Palomar plate used: R (E-plate print)
Object's name: HD 46265
Comments: In a dark lane/cloud, K0, 8.2m; Object 397 in the Gonzalez and Gonzalez list.
= NGC 2245, Ced 80, [SS62] 53
Pos (1950.0) 06:30.0, +10:12
Size: 5x3 (blue), 5x3 (red).
Bernes, C. (1977) A catalogue of bright nebulosities in opaque dust clouds.
= DG 108, [RK68] 60, Bernes 95, N2245, GN 06.29.9, Ced 80, [SS62] 53, Other designations: LkHa215,V699 Mon,P13
Class: CN (cometary nebula)
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.
Photo Index by Jim Lucyk: Vehrenberg's Atlas of Galactic Neb-1 p96.
Steve Coe (Glendale, Arizona, USA) observing with a 13.1-inch f/5.6 reflector, writes in The Webb Society Nebulae and Clusters Section Report No. 11, January 1993: "Pretty bright, small and fan-shaped, with a star of about mag 11 at the apex. Fainter version of NGC 2261. [Other reflection nebulae close by NGC 2245, and part of a star-forming complex, are IC 446, VdB 74, 78, 79 & 82]"
Steve Coe, observing with a 13" f/5.6, notes: "is pretty bright, pretty small and fan-shaped with a star of about 11th mag at the apex. This is a fainter version of Hubble's Variable Nebula."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "5'x 3' extent; faint nebulosity surrounds 11M star in a general area of the sky replete with clusters and nebulae."
The Messier objects
The Bennett objects
The Caldwell list
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