AMATEUR ASTRONOMY PAGES
Javier Gómez Laina                                                
                                                                M81  &  M82  in Ursa Maior
            


Object:             M81 & M82     - spiral galaxies -   also barely discernible Holmberg IX (UGC5336) 
Telescope:       COMELLAS  telescope (250 f/5.4 Newton) TV Paracorr, Astronomik H-alpha & LPS filters.
Camera:           Canon 350d  modified (infrared filter removing)
Exposures:       41 x 500" Ha  +  39 x 300" RGB 
ISO:                 800 (Ha) ;  400 (RGB) 
Date:                8 - 27 Apr 2006
Guiding:           MX716 on 2x barlowed TV-76
 

Processing:

Darks & Flat calibration
SDMask combining
Dynamic Background Extraction (sky gradient correction)
Digital Development Processing (DDP)
Curves adjust

Software:
ImagesPlus, PixInSight, PhotoShop.