NGC 7023 (Iris Nebula) and Molecular Clouds in Cepheus
Images below show a dusty 6.25° × 4.0° large region in Cepheus containing NGC 7023 (Iris Nebula) and VdB 4141 (Ghost Nebula).
It is a result from a test shots with new instruments for the Northern hemisphere survey.
A report about the newly used SDSS filters including a comparison with RGB can be found at here.
6.25° × 4.0°
12/2021 to 01/2022
2-3 × 100mm lens at f=300mm (3× array was not fully operational at beginning)
2-3 × IMX455 (3× array was not fully operational at beginning)
North is up (exactly)
3 arcsec/pixel (at full resolution)
Total exposure times:
All image processing steps are deterministic, i.e. there was no manual retouching or any other kind of non-reproducible adjustment. The software which was used can be downloaded here.
Image processing steps where:
Bias correction, dark current subtraction, flatfield correction, noise estimation
Alignment and brightness calibration using stars from reference image
Stacking with masking unlikely values and background correction
Denoising and deconvolution
Dynamic range compression using non-linear high-pass filter