Also known as the Lower Nebula, SH 2-261 is located in the direction of the Orion constellation, at a distance of approximately 3200 light years from Earth. It is distinguished by its complex structure and varied composition. It is mainly composed of ionized gas, giving it a characteristic glow due to radiative excitation from nearby hot, massive stars.
The light emissions from this nebula were captured using specific filters that allow different wavelengths of the light spectrum to be viewed. Thus, I was able to use two narrowband filters to achieve this image. This is the H-filter.
alpha which makes it possible to isolate the emission spectrum of ionized hydrogen (red color in the image), and the Oiii filter to detect the emission of doubly ionized oxygen (blue color).
Technical details :
Takahashi FSQ 85 telescope at F/D 5.3
iOptron 60 cem EC mount
Zwo Asi 2600mm pro
Antlia pro 3nm filters
HA 248 x 180s : 12 h 24 min
Oiii 170 x 300s : 14 h 10 min
Total integration : 36 h 34 min
Dark and Flat : 31/25
Date : February/March 2023
Location : Oukaimeden, Morocco.