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RA: 05h 36m 25s
Dec: −06° 42′ 43″
Ch: MSA:278, U2:271, SA:11
Type: reflection nebula
Mag: B=?, V=?
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Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a star with milky chevelure or vB nucleus with milky nebulosity." In the Philosophical Transactions, 1791, Herschel wrote: "October 5, 1785. A star with a strong burr all around. A second observation calls it a very bright nucleus, with a milky nebulosity, of no great extent. A third suspects the milkiness to belong to more of the same, which is diffused over the whole sweep in that place; but a fourth says, that the milky nebulosity is much stronger than what the nebulous ground, on which the star is placed, intitles it to. The connection between the nebulosity and the star is evident."
!! vB, pL, a dense globe with an absolutely dark triangular hole cutting into it. Outside this is an irregular atmosphere of diffuse nebulosity.
Ced 55i (NGC 1999)
Position (1900): RA 5 31.6, Dec - 6 47
Star: 6 1253 (Mp=9.5:, V=9.5:)
Spectrum of nebula: (not classified)
Classification: Neb associated with mainly one star (which may be multiple) - Fan-shaped object (eg. IC 59)
Notes: "Ced 55 i = NGC 1999 = GC 1202 = H IV 33. Disc. 1785. (114, 191, 201, 232, 296, 557, 578, 630 Pl 34, 631, 831). R. This is IC 427 + IC 428. Ced 55: The Orion region. History and bibliography: (118, 119, 186, 188, 191, 276, 352). The nebulous groundwork and the exterior nebulosities: (20, 21, 26, 53, 58, 78, 142, 143, 186, 191, 206, 207, 278, 279, 281, 282, 289, 305, 312, 438, 480, 519, 540. 541, 593, 594, 595, 620, 625, 628, 630 Pl 34, 663, 675, 715, 726 No 41, 769, 782, 802, 818). R. It is shown on several photographs, e.g. (630) Pl 34, that the whole region of the constellation Orion is filled up by vast masses of nebulosity. As is well known, there are several condensation which seem to stand out from the general background, and which have been separately discovered and studied. Such subnebulae, will be individually discussed below. Taken as a whole, No 55 of the catalogue should be classified as C. 2 in addition to the separate classes of the subnebulae."
Lynds, B.T. (1962) Catalogue of dark nebulae. Astrophys.J.Suppl.Ser. 7, 1-52. [also: computer datafile: VII/7A]
= NGC 1999, Ced 55i
Pos (1950.0) 05:34.0, −6:45
Size: 17x17 (blue), 20x20 (red).
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.
Bernes, C. (1977) A catalogue of bright nebulosities in opaque dust clouds.
= Bernes 122
= DG 60, VdB 46, Bernes 122, N1999, GN 05.34.1, Ced 55i, Other designations: V380 Ori
Class: C (reflection neb)
Photo Index by Jim Lucyk: Vehrenberg's Atlas of Galactic Neb-1 p73.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; <1' diameter; fuzzy halo with neat, small, dark splotch just W of 10M center star; clearly visible at >200x; associated with I.427-8 just N and a little E which is very, very faint! I.430 is also a very faint, small slash just to the SE near 49 ORI; DBL ST Struve-754 (see Iota ORI) is 40' due N of N1999."
Listed by the Herschel Club, described as "estimated magnitude 10, diffuse nebula in Orion, bright nucleus, with hazy appearance surrounding it. 16' x 12' in size, making it large and difficult to see, use averted. 8-inch, 96x."
Le Forbes (Stoke, St. Mary Bourne, Hampshire) observing from Siding Spring, Australia, writes in The Webb Society Nebulae and Clusters Section Report No. 11, January 1993: "Roughly circular and surrounding a star-like point. Quite bright and appears brighter on the northern side. [This object is in a region rich in Herbig-Haro objects, viz. HH 1, 2, 3, 33, 34 and 40.] (12.5-inch, x76, Seeing A I-II)"
05 36.5 -06 42
17.5: bright, high surface brightness emission nebula surrounding a mag 10 star, round, about 2' diameter. There is a prominent curved irregular dark patch along the W side of the central star which stands out prominently at high power. The nebulosity is weakest on the SE side of star. Easily takes 220x.
13: a curving dark lane is visible W of the central star with faint nebulosity W of the gap.
8: small circular nebulosity surrounds a mag 10 star.
Steve Coe, using a 13" f/5.6, notes: " Pretty bright, pretty large, round, somewhat brighter in the middle, stellar nucleus, with several dark markings at 220X. This object is brightest on the north side and averted vision makes it grow in size."
[amastro] posting, Sat Nov 25, 2006
82" telescope, McDonald Observatory near Fort Davis, Texas, USA
f/13.7, 35mm Televue Panoptic (5' fov, 812x)
NGC 1999, with Herbig Haro 1 & 2 nearby, Orion
NGC 1999 is a bright diffuse nebula with a distinct triangular dark spot near its center. Many observers said it looked like Africa. It is a terrific object in my 25" and was spectacular in the 82", and exceeded my expectations. However, one of most exciting areas of the weekend was just south of 1999. Armed with a good photo and being able to identify the field with full confidence, HH 1 & 2 were spotted with direct vision. Oh, they were faint, but they were there. Whoa thunk. What a treat!
Instrument:12-inch Dobsonian Reflector Telescope.
Eyepieces:26mm Super Wide Field Eyepiece.
20mm Ultra Wide Angle Eyepiece.
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.
1.2.First Impression:This object looks like a tiny cloud of gas and dust.
1.5.Chart Number:No.29(Extract taken out of "Herschel 400 Observing Guide").
1.6.Size:26mm Eyepiece:Field Of View:57'/12=4.7'.
20mm Eyepiece:Field Of View:50'/11.5=4.3'.
Size in Arc Minutes:4.5'.
1.8.Brightness Profile:On the far outskirts of this nebula it
is slightly faint while towards the centre of this nebula it grows brighter.
1.9.Challenge Rating:Very Easy.
This nebula looks like a planetary nebula and it has a
round shape.No areas of uneven brightness is observed.
The Messier objects
The Bennett objects
The Caldwell list
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