About image
NGC 5248 is a spiral galaxy in the constellation Bootes: it is 10th magnitude and 6.2'x 4.5 'in size.
It has an extremely luminous core and two very extended spiral arms which in my image can be glimpsed as they are very little detached from the sky.
The image was obtained from my home terrace, surrounded by street lamps: the total exposures of almost 6h was divided into four evenings because, as this galaxy is positioned in the sky in this period March/April, for every evening I have an useful window of about 1h30' maximum before the optical tube is inexorably hit by the light of the street lamps ...

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        Hutech Idas LPS-P2 50.8 unmounted
Guiding system      OAG Starlight Xpress with Lodestar
Exposure details    L: 35x600" bin1 -20C
Total integration    5.8h
Acquisition        Maxim, PHD2
Processing        Pixinsight 1.8, Photoshop CS5
SQM-L         18.4     
Location         Home terrace (Rescaldina, Italy)
Date             27/28/29 March 2017, 21 April 2017