NGC 6951 in Cepheus
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CLICK ON IMAGE FOR FULL SIZE VIEW (4102x2778) 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: +66°06'47"
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