sponsored by psychohistorian.org
RA: 05h 47m 8s
Dec: +00° 17′ 53″
Ch: MSA:253, U2:226, SA:11
Ref: [2003A&A...399..141M], SIMBAD
Type: reflection nebula
Mag: B=?, V=?
Synonyms: H IV-036
Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a star affected with vF extensive milky chevelure. The star not quite central." In the Philosophical Transactions, 1791, Herschel wrote: "January 1, 1786. A star surrounded with milky chevelure; the star is not central. A second observation calls it affected with a very faint, and extensive, milky chevelure. A third only mentions a star affected with milky chevelure. As by the word chevelure I always denoted something relating to a center, the connection cannot be doubted."
Detection of new nebulae by photography. Annals Harv Coll Obs., 18, 113. Bibcode: [1890AnHar..18..113P]
Photographs taken with the Bache telescope, a photographic 8-inch f/5.5 doublet, covering 10 degrees square, were examined by Mrs M Fleming with a magnifying glass.
Table 1: List of nebulae (p115)
Confirms NGC 2071 (No. 26 in the table).
Ced 55v (NGC 2071)
Position (1900): RA 5 42, Dec + 0 16
Star: 0 1181 (Mp=10.8, V=10.4, SpT=B9)
Spectrum of nebula: continuous spectrum (observed)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope with conspicuous structure (eg. IC 5146)
Notes: "Ced 55 v = NGC 2071 = GC 1270 = H IV 36. Disc. 1786. FA 98. WP 166. (114, 173, 196, 216, 238, 366, 409 Pl 14, 578, 604, 630 Pl 34, 715). 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 2071, Ced 55v
Pos (1950.0) 05:44.6, +0:18
Size: 9x9 (blue), 8x8 (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 101
= DG 81, [RK68] 43, VdB 60, Bernes 101, N2071, GN 05.44.6, Ced 55v
Class: C (reflection neb)
by Jim Lucyk: Vehrenberg's Atlas of Galactic Neb-1 p77.
Coe, using a 13" f/5.6, notes: " Faint, pretty small, irregularly round, seen at 100X. Going to 220X brings out the fact that the star within this nebula is double. It is approximately 10th and 13th mag with a seperation of 10" in PA 200 degrees. Averted vision makes the nebluosity grow and elongate in the E-W direction."
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.