Sh2-133
About image
Sh2-133 is an emission nebula in Cepheus constellation.
It is a long, nebulous filament located at a distance of about 2600 light-years; it is thought to be part of a long front of ionized gas surrounding the older stars of the Cepheus OB2 association, a bright OB association whose average age is estimated to be around 4 million years.
It is a faint nebula, not exactly the good target for my backyard sky: but it was in a very good position above horizon and out of the trees places on east side of my backyard, so I decided anyway to try.
On RGB frames the nebula is barely visible, so the most of the contributions is given by Ha signal and RGB was done only for the stars.
Technical data
Optic Tecnosky Apo refractor LT 130-910 with Riccardi reducer 0.75x (focal lenght 692mm, f/5.3)
Mount Skywatcher EQ8
Camera Moravian G3-16200 with external filter wheel 7 positions
Filters Baader 50mm unmounted RGB , Ha 7nm
Guiding system Artesky Ultraguide 70mm
Exposure details R 27x120" bin1 -15C
G 28x120" bin1 -15C
B 28x120" bin1 -15C
Ha 50x600" bin1 -15C
Total integration 11h6'
Acquisition Voyager, PHD2
Processing Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L Bortle 8
Location Rescaldina (Italy), home terrace
Date 29 August, 9/10 September 2024
© Roberto Marinoni 2019 - All rights reserved