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NGC 3938 and NGC 4013



Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 24 February 2020,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 22 x 12 min  (1x1 bin) exposure with UV/IR block filter,  10 x 4 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration and Mure Denoise- Pixinsight. Weighted sub-frame integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching and normalization  - PixInsight.  Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering.  Images processed at resolution 3352x2532. Final Image size is approximately  3000x2250.

North is up in this image.  NGC 3938 is a classic face on spiral galaxy - SA(s)c - at the upper right of this image. Left center is NGC 4013 - Sb edge-on - galaxy. In the lower portion of the image is Arp 62 (APG 62) which is really a pair of interacting galaxies. Thee are a number of other background galaxies in the image that can only be seen in the full size image. Also, there are a number of distant Quasars - the furthest has a large redshift of 2.205.  NGC 3938 is about 48 million light years distant and NGC 4013 is about 49 million light years distant. These objects and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 88 arc minutes. Full size image scale is 1.76 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 11h 55m 09s Dec: +4353'06"


All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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