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RA: 05h 40m 13s
Dec: −01° 27′ 47″
Ch: MSA:253, U2:226, SA:11
Ref: [2003A&A...399..141M], SIMBAD
Type: reflection nebula
Mag: B=?, V=?
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)
No. 19 "Nebulosity surrounding DM -1 1001."
Duncan, J. C. (1921) Bright and dark nebulae near zeta Orionis photographed with the 100-inch Hooker telescope. Astrophys. J., 53, 392-396.
Ced 55l (IC 431)
Position (1900): RA 5 35.2, Dec - 1 31
Star: 1 1001 (Mp=7.6, V=7.8, SpT=B5)
Spectrum of nebula: continuous spectrum (inferred from sp.t. of illuminating star)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope without conspicuous structure (eg. lambda Scorpii)
Notes: "Ced 55 l = IC 431. Disc. Pickering 1890 (557). FA 98. WP 166. (216, 366, 715). R. -1 1001 = HD 37674. 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]
= IC 431, Ced 55l
Pos (1950.0) 05:37.8, −1:29
Size: 6x4 (blue), 2x2 (red).
Bernes, C. (1977) A catalogue of bright nebulosities in opaque dust clouds.
IC 431 = Bernes 108
= DG 72, [RK68] 36, VdB 50, Bernes 108, IC431, GN 05.37.7.01, Ced 55l
Class: C (reflection neb)
by Jim Lucyk: Vehrenberg's Atlas of Galactic Neb-1 p68.
The Messier objects
The Bennett objects
The Caldwell list
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