Home Galaxy Gallery Nebula Gallery Globular Clusters Open Clusters My Equipment Misc Astro Gallery


NGC 2841 in Ursa Major



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 16 January 2021,  Camera: ASI294MM (Baader L RGB filters)

Exposure: Exposure: L - 32 x 6 minutes (gain-121 2x2) ,  RGB - 16 x 4 minutes (gain-121 2x2) each RGB exposures.

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, Multiscale HDR, 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  4144x2822.

North is up in this image.  The Galaxy NGC 2841 is the dominant object in this image. It's classification is SA(r)b and is at a distance of 37 to 48 million light years. Also in this image are some notable background galaxies (PGC  26351, 26362, 26363, and 26572). The later three are 368 to 381 million light years distant; PGC 26351 is closer at 33 to 67 light years distant. There is a distant galaxy (ASK 152883.0) at a distance of 1,239 million light years and further distant Quasars with high redshifts.  These objects and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 40 arc minutes. Full size image scale is approximatetly 0.58 arcsec/pix.. This image replaces  an earlier image in the Archives here.

Image center is approximately - Equatorial 2000: RA: 09h 21m 25s Dec: +5055'00"


All images and content remain the property of Jim Thommes - copyright 2003 - 2021

Current Web Total Hits -

- Unique Visitors