vdB131,132, LBN281 - Reflection Triplet in a Field of Hydrogen
vdB131,132, LBN281 - Reflection Triplet in a Field of Hydrogen
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MOUSE-OVER
IMAGE FOR STARLESS VIEW CLICK
ON IMAGE FOR FULL SIZE VIEW (6080x4151) Scope:
Celestron 9.25 Edge HD 235 mm at f/7;
Location: DAA Observatory, Shelter Valley, CA;
Dates: 30 June, 2, 3 July, 2024; Camera: ASI294MM (Baader
Ha LRGB Filters) Exposure:
Lum 84 x 3.5. minutes (gain-121 2x2), Ha 91 x 3.5 minutes (gain-160 2x2), RGB -
32 each x 2 minutes -
(gain-121 2x2).
Processing: Data
Collection - N.I.N.A. (as FITs). Sub-frame calibration - Pixinsight
(WBPP). Sub-frame registration and integration (Average combine -
Linear fit clipping, 2X drizzle for Lum) - PixInsight (WBPP).
Noise reduction - NoiseXTerminator (RGB, Lum) - PixInsight. Non-linear stretching for Lum -
PixInsight. RGB combine and stretching, Photometric RGB calibration (SPCC)
- PixInsight. De-convolution - BlurXTerminator (AI4) - PixInsight.
Generation of starless Lum, Ha, and RGB image for later processing -
StarXTerminator (PixInsight). Lum stars (lower stretch) L-RGB
Combination into RGB stars for star size control - PixInsight. Lum
starless L-RGB Combination in to RGB starless image - Pixinsight. Ha
starless L-RGB Combination into L-RGB starless (with Ha brightness mask) -
PixInsight. L-RGB stars screened into final Ha-L-RGB starless image -
Affinity Photo. Final finishing -
Affinity Photo. Annotation - PixInsight, Aladin (Simbad), and Affinity
Photo. This image is an LRGB image with Ha highlights. Image processed at 8288x5644
resolution (2x drizzle stacks). Full Field image size is approximately 6080x4151.
North is to the right in
this image. This image shows a bright blue threesome of reflection nebulae
(vdB131, vdB132, LBN281) in a field of Hydrogen ( DWB105, DWB113,
DWB114). The distance of these structures ranges from 5,500 to 7,000 light
years. The lower portion of this image (and generally below the Reflection
Triplet) features some dark nebulae. Three identifiers are given for these
dark nebulae - DOBASHI 2498, 2504, and 2509 (from left to right).
There
is an interesting bipolar nebula just upper left of vdB131. This is
designated Parsamian 22 (also GN 20.22.7, PP95, and [B77] 22) and is
associated with the young stellar object HBC 694 - a proto star. The
nebula was first identified in 1965 and there have been several
studies since then dedicated to this nebula (or its surrounds)
about its features and characteristics. Its distance is not well known -
one study estimates about 4,000 light years.
These objects, information, and some of the brighter
stars are identified in the annotated
image.
The Horizontal Full FOV is approximately
0.667 degrees. Full size, full field image scale is approximately 0.39 arcsec/pix.
Image
center approximately - Equatorial 2000: RA: 20h 25m 01s Dec: +42°24'36"
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