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NGC 6951 in Cepheus



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 3 and 7 July 2021  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 64 x  6 minutes (gain-180, 2x2),  RGB - 20 x 3 min each filter (gain-121 2x2).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight. Starless generation and de-convolution of starless image  (prior to recombination with stars) - PixInsight/StarnetV2. Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels,  RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 4144x2822 resolution. Final Image size is approximately  4102x2778.

North is up in this image.  This is an image of the galaxy NGC 6951  and surrounding Milky Way interstellar matter. NGC 6951 is a barred spiral with ring structure (SAB(rs)bc) and is about 80 million light years distant. There are molecular clouds catalogued in the PGCC in this image (PGCC G100.77+14.92 and PGCC G101.06+14.750). Surprisingly, there are four Quasar candidates  visible in this image - the greatest lookback time is 10.7 billion light years with a redshift of 2.200. These objects, information, and some of the brighter stars are identified in the annotated image Horizontal FOV is approximately 39 arc minutes. Full size image scale is approximately 0.57 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 20h 37m 09s Dec: +6606'47"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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