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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.
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Object Details: |
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| 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: |
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| 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 |
