Another wide field view into the region of Cepheus and Cassiopeia. Click “Read more” to see details about the objects visible in this view.

Here is an annotated view of this field where the most prominent objects are marked.

Most prominent is the large star nursery Sh2-171 with embedded star cluster NGC7822. It’s about 3000 light years from home and it is mainly powered by one of the hottest stars in the solar neighborhood. It’s surface temperature is about 45000 degree Kelvin and its luminosity is 100000 times as large as our sun’s luminosity. This is enough to make all this gas glow. Other star forming regions are also shining in red as the Small Rosetta Nebula, the Pacman Nebula and the “Ghost of Cassiopeia” (IC 59). The later consists also on a reflection nebula. Star clusters as NGC 7789 and many many dark molecular clouds complete the picture.

Acquisition Details

Lens: Sigma 135/F1.8 DG HSM ART
Lens Speed: F4
Filter: Haida Nano Pro UV-IR-CUT
Camera: Canon EOS Ra
Mount: Skywatcher Star Adventurer Pro
No Guiding
Light Frames: 139x60sec
Bias, Darks, Flats
Manual dithering every 20 exposures only in RA
Camera settings: ISO 3200
Bortle 4-5
Acquisition Date: September 01, 2021

Processing

Imaging: PixInsight (pre-post-processing)
Noise Reduction: Topaz AI Denoise