| Object: M76 (the Little Dumbbell) - planetary nebula Telescope: COMELLAS telescope (250 f/8.3 Newton). Lumicon 1.8x multiplier/corrector. Camera: Artemis ART4021. Baader H-alfa & OIII filters. Exposures: Ha: 33 x 1800" ( 16:30 ) Oiii: 26 x 1800" ( 13:00 ) Resolution: 0.73"/pixel Guiding: MX716 on Off-Axis Guider Date: 21 Dec 2008 - 17 Jan 2009 Site: Sagan Observatory Las Rozas (Spain) - mag 4.5 suburban skies - |
Processing: Bias, Darks & Flat calibration SDMask combining Curves and histogram adjust Dynamic Background extraction Noise reduction LRGB: L (Ha-Oiii); R (Ha); G (Oiii); B (Oiii) Software: MaximDL, PixInSight , PhotoShop CS3 |