NGC 6538 (Sh2-158) in Cepheus




© Velimir Popov & Emil Ivanov 2020
Size: 1800 px
Often overshadowed by the more famous and near lying Bubble Nebula, the emission nebula NGC 7538 (Sh2-158, or LBN 542) is home for a high-mass protostar with a rotating disk that has a diameter of about ten times the diameter of our solar systems (about 800 AU). While we still don't know very much about high-mass protostars, it is assumed that they are surrounded by an accretion disk that drives molecular outflow, like the low-mass protostars.The accretion disk in NGC7538 is very young and extremely massive, and is in the process of forming one or more high-mass protostars. NGC7538 is about 7000 light years away in the constellation Cepheus.

Image details:


Center of field RA 23:13:39 (h:m:s)
Center of field DE +61:30:22 (deg:m:s)
Size 15.9 x 11.6 (arcmin)
Pixel scale: 0.529 (arcsec/pixel)
Orientation: Up is 1.59 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" Astrograph @ f/6.3 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters Ha, OIII Baader filters
Dates/Times: 24,26,27.Nov.2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:6x10 min,R:6x10 min,G:6x10 min,B:6x10 min,Ha:35x15min,OIII:34x15min. Bin 1 Total exp.time: 1275min (22:15 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2020. All Rights Reserved
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