Sh2-157, Lobster Claw nebula

About image
Sh2-157 is a large emission nebula in Cassiopea constellation: due to its particular shape it is also called “Lobster claw” nebula. 

It is located on the Perseus Arm, one of the main spiral arms of Milky Way, and it is directly linked with the association OB Cassiopeia OB2: inside this nebula there is a cluster of very young stars called Mrk50 and on the upper side of nebula it is also clearly visible the open cluster NGC 7510.
Many other nebulas are visible in this image: among the others the Bubble Nebula NGC 7635 on the left lower side and the very bright HII region NGC 7538 on the left side.

Technical data
Optic          TS Optics 76 EDPH - Aperture 76mm, focal lenght 342mm, f/4.5
Mount        Skywatcher EQ6R
Camera         ZWO ASI 294MM Pro with external filter wheel 7 positions
Filters         Antlia 36mm RGB, Antlia 36mm Ha 3.5nm
Guiding system    Artesky Ultraguide 32mm
Exposure details  R 52x120" bin2 -15C
                                    G 52x120" bin2 -15C
                                    B 52x120" bin2 -15C

          Ha 46x300" bin2 -15C

          Gain 120, offset 30 
Total integration  9h2'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5
SQM-L       NA    
Location       Promiod (Aosta Valley, Italy)
Date           8/10/11 August 2021

© Roberto Marinoni 2019 - All rights reserved