Cluster with Nebula NGC 1931

Object Description

NGC 1931
NGC 1931: Section of the Digitized Sky Survey. © STScI [147]

NGC 1931 was discovered by Wilhelm Herschel on February 4, 1793. It is a young star cluster, surrounded by a nebula of gas and dust and has partly amorphous, but partly also a filament-like structure. The dust nebula surrounds a small cluster of faint stars. It resembles a miniature version of the Orion Nebula and is located in a spiral arm of the Milky Way, which is probably an extension of the Perseus arm. Distances vary from 1.8 pkc to 2.16 kpc (5870 to 7050 light years). The nebula has an angular dimension of 4'x4 'and an integrated brightness of 11.3 mag. [196, 219]

NGC 1931
NGC 1931: Infrarot image of the surrounding area (allWISE color) [147]

As can be seen on the infrared image of the Wide-field Infrared Survey Explorer (WISE) in Fig. 2, NGC 1931 belongs to a larger, loosely connected complex of H-II clouds in the constellation Auriga, to which IC 405, IC 410 (with open star cluster NGC 1893), as well as from the Sharpless catalog Sh 2-231, Sh 2-232, Sh 2-233 and Sh 2-235 belong. However, these are so faint that they cannot be captured visually, but only photographically.

«Revised New General Catalogue and Index Catalogue» Dr. Wolfgang Steinicke, 2021 [277]
DesignationNGC 1931
Right Ascension05h 31m 25.7s
Declination+34° 14' 42"
Visual magnitude10.1 mag
Dreyer DescriptionvB, L, R, B *** in M
IdentificationLBN 810, OCL 441

Finder Chart

Approximately between the two stars ι Aurigae (Hassaleh) and θ Aurigae is NGC 1931 in the immediate vicinity of the two beautiful open star clusters Messier 36 and Messier 38 and the smaller NGC 1907. About one degree to the west of NGC 1931 is the 5.1 mag bright Star φ Aurigae, which can still be recognized by the eye. This object can be easily observed from September to April.

Chart NGC 1931
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


147Aladin Lite; (2020-12-23)
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
196Celestial Atlas by Curtney Seligman; (2020-12-28)
219«Photometry of open cluster NGC 1931»; Pandey, A. K.; Mahra, H. S.; Astrophysics and Space Science, Volume 120, Issue 1, pp.107-113; Pub Date: March 1986;; DOI:10.1007/BF00653902; Bibcode:1986Ap&SS.120..107P
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; (2021-02-17)