NGC 2903 in Leo
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CLICK ON IMAGE FOR FULL SIZE VIEW (4092x2801) Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 28 February 2022, Camera: ASI294MM (Baader LRGB Filters) Exposure:
Exposure: L - 64 x 3 minutes (gain-160 2x2) , RGB - 20 each x 2.5 minutes
- (gain-121 2x2).
Processing: Data
Collection - Sequence Generator Pro (as FITs). Sub-frame calibration
- Pixinsight (WBPP). Sub-frame registration and integration (Average combine - Winsorized Sigma
Clipping) - 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 - Star XTerminator. 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 4092x2801. North is up in this image. The
galaxy toward the left is NGC 2903 - a SAB(rs)bc, a barred spiral with
weak ring. It's distance is
comparable by independent estimate (27.9 million light years) and by redshift estimate
(39
million light years). NGC 2903 is accompanied by a smaller Magellenic irregular
galaxy PGC27115 - at a distance of 24.3 million light years (estimated by
redshift). This image also shows numerous background galaxies in this region
of the sky. Two of these galaxies distance exceed one billion light years (Lookback)
- ASK 591791.0 and SDSS j093041.44+212722.1 - this latter galaxy has a nearby
galaxy (ASK 591128.0) that may be interacting.
There seems to be a long, distorted tail on this pair.
Some Quasars are also visible in this image as well. The visible Quasars range from
2.48 to 11.1 billion light years (Lookback). These objects,
information, background galaxies 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 here.
Horizontal FOV is approximately 39 arc minutes. Full size
image scale is approximately 0.58 arcsec/pix.. Image center is approximately - Equatorial 2000: RA: 09h 31m 35s Dec: +21° 28' 57"
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