About image
This image shows a rich area in the constellation Cassiopeia, towards the border with the constellation of Cepheus.
The open cluster visible on the left is M 52, composed of a hundred white stars, from which the relatively young age of the cluster can be understood; its estimated distance is 4500 light years.
At the top right is the nebular complex of NGC 7635, also called "Bubble Nebula" because of its shape.
It is an HII region, at whose southern vertex there is an empty structure, caused by the pressure of the radiation of a central blue star, whose stellar wind reaches 2000 km / s; it is a blue giant, which is also responsible for the ionization of the nebula, which then emits its own light. Its distance from the Sun is estimated at 11,000 light years.

Technical data
Optic            Tecnosky Apo Refractor LT 130 - 910mm f/7
Mount          10Micron GM1000 HPS - EQ8
Camera           Moravian G3-16200 with external filter wheel 7 positions
Filters        Baader HaRGB 50.8 unmounted
Guiding system      OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details    Ha 10x1200" + 10x900", all bin1 -20C
                                      R 5x600" bin1 -20C
                                      G 5x600" bin1 -20C
                                      B 5x600" bin1 -20C
Total integration    8.3h
Acquisition        Maxim, PHD2
Processing        Pixinsight 1.8, Photoshop CS5
SQM-L          -    
Location         Passet (Aosta Valley, Italy), home terrace (Rescaldina, Italy)
Date            22/23 August 2018