SH2-206 (also known as NGC 1491) is an emission nebula in constellation Perseus.
The region is ionized by the star BD +50 886 which lies in a distance of about 10,700 ly (light years) from Earth (Gaia DR3 data).
The stellar wind of this star interacts with the matter of a surrounding molecular cloud and forms a bubble, similar to the one of the Bubble Nebula but much smaller: about 60" (arcseconds) or 3 ly.
The diameter of the ionized region of the molecular cloud is about 100 ly.
Click on the images for a full scale version.
0.64° × 0.5° (full view)
400mm Newton at f=1520mm
North is up (approximately)
0.8 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, photon counting
Dark current subtraction, flatfield correction, noise estimation
Alignment and brightness calibration using stars from reference image
Stacking with masking unlikely values and background correction
Extracting stars from the emission line images using information from continuum images
Denoising and deconvolution both components (stars and residual)
Dynamic range compression using non-linear high-pass filter