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


North American Nebula Region



Scope: Sigma 150 APO DSLR Lens at f/4.5, Location: DAA Observatory, Shelter Valley, CA, 4 and 7 August 2021,  Camera: ASI294MM (Baader Ha, RGB, ZWO OIII filters)

Exposure: Exposure: Ha - 48 x 4 min (gain-180 2x2), OIII - 36 x 4 min (gain-180 2x2) ,  RGB -20 x 2 min (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.  Generation of starless nebulosity Ha and OIII images for later processing - starnet++. Curves, Levels, RGB combine, Luminance layering for stars - PixInsight. Stars and Starless  combine - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  Bicolor narrow band image (modified HOO) with RGB stars.  Image processed at 2822x4144 resolution. Final Image size is approximately  2552x3800.

North is up in this image.  This image shows the popularly known North American Nebula region. Its wide field coverage includes the Pelican Nebula (IC 5070, LBN 350), IC 5968 (LBN 328), and the dark lane that runs South to North through this field. There are many dark and bright nebulae from Lynds catalogs and others. There are also, open clusters NGC 6997, Berkeley 54 and planetary nebula NGC 7027 (PK 84-3.1). These objects, some Lynds cataloged objects and some of the brighter stars are identified in the annotated image. Vertical FOV is approximately 7.37 degrees. Full size image scale is about 7.0 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 20h 54m 37s Dec: +4317'29"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

Current Web Total Hits -

- Unique Visitors