North American Nebula Region
|
CLICK ON IMAGE FOR FULL SIZE VIEW (2552x3800) 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: +43°17'29"
|
All images and content remain the property of Jim Thommes - copyright 2003 - 2022Current Web Total Hits - - Unique Visitors |