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NGC 1973 (3,748 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 1973

NGC 1973, Ced 55b, GC 5352

RA: 05h 35m 0s
Dec: −04° 44′ 0″

Con: Orion
Ch: MSA:278, U2:225, SA:11


(reference key)

Type: bright nebula

Mag: B=?, V=?

Size: ?
PA: ?

Published comments

Pickering, E.C. (1890)

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. 10 "Nebulosity surrounding c Orionis. Dreyer 1973, 1975 and 1977 are portions of this nebulosity where the condensation of light is sufficient to be visible to the eye. The photograph gives it an extension of 2m.0 in right ascension and 2.5' in declination. As it is connected on the following side by nebulosity with the Great Nebula of Orion, true limits cannot be given in this direction. The photographs of this nebula are nearly equal to the best drawings yet made of the Great Nebula of Orion, both in extent and in the amount of detail shown."

Cederblad, S. (1946) [VII/231]

Ced 55b (NGC 1973)

Position (1900): RA 5 30.1, Dec - 4 48

Star: 4 1179 (Mp=7.9:, V=8.0:, 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)

Size: (not given)

Notes: "Ced 55 b = NGC 1973 = GC 5352. Disc. d'Arrest. R. According to (114) this is the nebulous star -4 1179 = HD 36958. 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."

Sulentic & Tifft (1973)

(Sulentic and Tifft 1973) notes that this is a diffuse nebula.

Photo index

by Jim Lucyk: Sky&Tel. 5/81 p463, Deep Sky #5 Wi83 p12, Deep Sky #6 Sp84 p32, Burnhams V2 p1336, Vehrenberg's Atlas of Galactic Neb-1 p68.

Bernes, C. (1977)

Bernes, C. (1977) A catalogue of bright nebulosities in opaque dust clouds.

Bernes 114 = NGC 1973 / NGC 1975 / NGC 1977

Modern observations

Tom Lorenzin

Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "N1975 and N1977 included; includes cluster of six brighter stars 0.5 degrees N of M-42; cluster includes fainter stars, 12 to 13M, >20 in number; unable to distinguish three separate parts as NGC designation would have us believe; OPN CL N1981 just N; Nebulosity is visible surrounding all."

Forbes, Le (1993)

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: "Almost triangular in shape, with the largest part to the east. KX Ori lies within. NGC 1975 and NGC 1977 are other parts of the same nebulosity, which appear clumped together as virtually one region on blue POSS prints. (12.5-inch, x76, Seeing A I-II)"

Ware, Donald J

:"this is a relatively bright region of nebulosity just north of the M- 42 complex. It is large, about 15'x10 and surrounds several relatively bright stars. It would be observed more often if it weren't located so close to M-42, and greatly deserves more attention."

Steve Gottlieb

05 35.1 -04 44

13: extensive bright nebulosity including N1975 and N1977, very large, elongated ~E-W. Involves several bright stars including 42 (V = 4.7) and 45 Orionis (V = 5.3). Irregular and detailed nebula with detached segments. Extends N-S beyond 42 Orionis. Located N of M42 and S of the bright cluster N1981.

Contemporary observations

Richard Ford

2012 March 24th, Sat



Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.

Instrument:12-inch Dobsonian.

This nebula's light is somewhat large and diffuse which is orientated in an East-West direction.This nebula's light however shines because the stars reflect the nebulosity within it.This nebula measures 9.2'*3'.This nebulosity is brighter in the center compared to the stars in the far outskirts of this nebula.

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