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NGC 5985 5982 5981 in Draco



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA,   12, 16 May 2023  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: 80 x 3.5 minutes (gain-121 2x2) ,  RGB - 24 each x 2 minutes  - (gain-121 2x2).

Processing: Data Collection -  N.I.N.A. Sequencer (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized  Clipping Rejection) - PixInsight (WBPP).  Mure Denoise - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels, RGB combine, Luminance layering - PixInsight. Generation of starless Luminance image for later processing - StarXTerminator. Photometric RGB calibration (SPCC) - PixInsight.  De-convolution - BlurXTerminator.  Final finishing  - Affinity Photo.  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 4086x2758.

North is up in this image. This grouping of galaxies is sometimes called the Draco Trio - from left to right is NGC 5985 , NGC 5982, NGC5981. Their distances (by redshift) are 118, 140, 118 million light years. The little galaxy above NGC 5982 is at a distance of 959 million light years.  This somewhat larger image field also captures NGC 5976 and  UGC 9934 (also known as NGC 5976A) to the right side of the image.  There are noticeable background galaxies seen on the full size image. There are multiple Quasars in this image (as seen on the annotated image) - the furthest of which has a redshift of  3.987 (light travel time or Lookback of 12.15 billion years). These objects, information,  and some of the brighter stars are identified in the annotated image This image replaces an earlier image that can be seen in the Archives hereHorizontal FOV is approximately 39.8 arc minutes. Full size image scale is approximately 0.58 arcsec/pix..  

Image center is approximately - Equatorial 2000: RA: 15h 38m 08s Dec: +5925'06" 



All images and content remain the property of Jim Thommes - copyright 2003 - 2024

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