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Sh2-274 or Abell 21, the Medusa nebula, is a very faint planetary nebula in the constellation of Gemini. Its distance is appx. 790Ly, the surface brightness
reaches only 16mag/arcmin².
Datum/Date:
March 2022
Optik / Scope:
7,5” Maksutov Newtonian Astrograph f/5.3 (Ha+OIII) | 8“ Newtonian f/5 (VIS)
Sensor/CCD:
ASI294 MC Pro @ -15°C
Autoguiding:
ASI290Mini @ ED 60/240 Guidescope
Belichtung/Exposure:
420x60sec VIS, 79x300“ Ha+OIII, total integration time = 13h35min
Workflow:
PixInsight, Photoshop CC, Combination of RGB stars and Ha+OIII dualnarrowband data
The Universe at a glance...
Juniper Hill Observatory
Köfering, Bavaria
12° 12’ E
48°56’ N
344m N.N.
Sh2-274 / Medusa Nebula
