NGC 7538

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.



Object Details:

Objects: NGC 7638 (Sh2-158, LBN 542)
Constellation: Cepheus
Center of field: RA: 23h 13m 45s Dec: +61° 28' 21"
Field dimensions: Ca 10 x 15 '


Technical Details:

Optics: 12" ASA Astrograph at F/6.8 and 3.6
Mount: ASA DDM 85
Camera: SBIG STL-11000M
Filters: Astronomik LRGB filters, Baader 8nm Ha filter, 8nm OIII filter
Dates/Times: 4, 26 and 27 November 2011
Location: Rozhen, Varna
Exposure Details: L = 60 min, R,G,B = 30 min.,Ha = 525 min, OIII = 510 min
Subexposures: LRGB = 10 minutes, Ha, O III = 15 minutes
Acquisition: CCD Soft
Processing: PixInsight, Photoshop CS

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