| Object: Messier
57, the ring (planetary) nebula in Lyra Telescope: Astrograph 400 f/4 Newton (APM 1.5x multiplier/corrector up to 2440mm fl). Paramount ME. Camera: Artemis ART4021. Baader H-alpha & Oiii filters. Astronomik RGB filters. Exposures: Ha : 96 x 15' (24:00 ) Oiii: 27 x 15' ( 6:45 ) R: 12 x 10' ( 2:00 ) G: 12 x 10' ( 2:00 ) B: 14 x 10' ( 2:20 ) Resolution: 0.39"/pixel (drizzle resampled) Guiding: Moravian G0 on Off-Axis Guider Date: September - October 2018 Site: Sagan Observatory Las Rozas (Spain) - mag 4.5 suburban skies - |
Processing (simplified): Bias, Darks & Flat calibration Drizzle integration Deconvolution Histogram & Curves adjustments HDRMT LRGB combining (nebula:Halpha-Oiii; stars:RGB) Software: PixInSight |