NGC 6946 - Fireworks Galaxy
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CLICK ON IMAGE FOR FULL SIZE VIEW (2802x1909) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 3 and 10 June 2021 Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 25 x 4.5 minutes (gain-121 2x2) and 32 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. 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 2802x1909. North is up in this image. This
is an image of the galaxy NGC 6946 also popularly known as the Fireworks Galaxy.
It is partially obscured by dust in the arms of our own Milky Way galaxy and
doesn't shine as bright as its brightness and distance would suggest - it
is about 19 million light years distant. NGC 6946 has been well studied -
many objects within its structure have been identified and catalogued. Some of
its brighter star clusters are identified in the annotated image linked below.
There is also a smaller, more distant galaxy that can be seen in the lower right
corner (2MASX J20324060+6000181) - its distance is about 324 million light
years. 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 0.84 arcsec/pix.. Image center is approximately - Equatorial 2000: RA: 20h 34m 52s Dec: +60°09'14"
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