SH2-170 is a faint emission nebula in constellation Cassiopeia. The ionization source is "LS I +64 11", the bright star in the center. Parallax measurements for this star are not precise and lead to a distance between 5100 light years and 6400 light years (Gaia DR3).

Click on the image to load a full view / full resolution version using a JavaScript viewer.

SH2-170 in false colors (SHO)
This image is a false color composite where [SII] is mapped to red, H-alpha is mapped to green and [OIII] is mapped to blue. Stars are partially subtracted using continuum images.
SH2-170 in false colors (OHS)
Same view as above, but [SII] and [OIII] are swapped in order to show more details of the oxygen structures (reddish).

Image data

FOV: 0.56° × 0.5° (full view)
Date: 2018-2021
Location: Pulsnitz, Germany
Instrument: 400mm Newton at f=1520mm
Camera Sensor: Panasonic MN34230
Orientation: North is up (approximately)
Scale: 0.8 arcsec/pixel (at full resolution)
Total exposure times:
H-alpha (3nm): 8.1 h
[OIII] (3nm): 12.1 h
[SII] (3nm): 14.1 h
NIR: 0.7 h
Blue: 0.6 h

Image processing

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:

  1. Bias correction, photon counting
  2. Dark current subtraction, flatfield correction, noise estimation
  3. Alignment and brightness calibration using stars from reference image
  4. Stacking with masking unlikely values and background correction
  5. Extracting stars from the emission line images using information from continuum images
  6. Denoising and deconvolution both components (stars and residual)
  7. RGB-composition
  8. Dynamic range compression using non-linear high-pass filter
  9. Tonal curve correction

RSS feed RSS feed Imprint Media on this page can be used under Creative Commons Attribution-
Noncommercial-Share Alike 4.0 license or other licenses.