NGC 1634: Cluster with Nebula

NGC 1624
NGC 1624: Star cluster with H-II region in Perseus; 500 mm Cassegrain f/7.2; SBIG STL11K; 240-50-50-50 min LRGB; Bernese Highlands; © 2017 Radek Chromik

History

NGC 1624 was discovered on December 28, 1790 by the German-British astronomer William Herschel with his self-made 18.7 "f / 12.8 reflector telescope in Slough, England. [196, 277]

Physical Properties

This is a young star cluster, embedded in the H-II nebula Sh2-212, which surrounds the star cluster like a shell. The age is estimated to be around four million years. The cluster consists of several massive main sequence stars and a large number of pre-main sequence stars. The brightest star is NGC 1624-2 near the center of the cluster. This star is the source of strong X-rays and rotates with a very strong magnetic field. About a fifth of the pre-main sequence stars are surrounded by dust disks. The cluster lies in the direction of the galactic anti-center at a distance of 6.0 ± 0.6 kpc. [445]

«Revised New General Catalogue and Index Catalogue» Dr. Wolfgang Steinicke, 2021 [277]
DesignationNGC 1624
TypeOCL (I2pn)
Right Ascension04h 40m 36.4s
Declination+50° 27' 42"
Diameter3.00 arcmin
Visual magnitude11.8 mag
Dreyer DescriptionF, cL, iF, 6 or 7 st + neb
IdentificationOCL 403, LBN 722, Ced 37, S 212

Finder Chart

The star cluster with H-II nebula is located in the constellation Perseus. The best time to observe is September to February, when it is highest at night.

Chart NGC 1624
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
445«The Sejong Open Cluster Survey (SOS). IV. The Young Open Clusters NGC 1624 and NGC 1931» Beomdu Lim, Hwankyung Sung, Michael S. Bessell, Jinyoung S. Kim, Hyeonoh Hur, and Byeong-Gon Park;The Astronomical Journal, Volume 149, Number 4, 215; DOI:10.1088/0004-6256/149/4/127