About image
NGC 1501, also called the Oyster Nebula, is a planetary nebula visible in the constellation of the Giraffe, about four thousand light years away from the solar system.
The nebula has the form of an ellipsoid of low eccentricity: it has magnitude 13.3 and an apparent diameter of 52 ".

Technical data
Optic          Celestron C9.25 Edge HD f/10
Mount        Losmandy G11 with Ovision worm and FS2
Camera         Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters        Baader Ha 7nm and OIII 8.5nm, 50.8 unmounted
Guiding system    OAG LB Astro Proxima and Lodestar
Exposure details  Ha 13x600" bin1 -20C
                                    OIII 17x600" bin1 -20C
Total integration  5h
Acquisition      Maxim, PHD2
Processing      Maxim, Photoshop CS5
SQM-L        -     
Location       Home terrace (Rescaldina, Italy)
Date          12 November 2013