Sharpless 284 in Monoceros
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CLICK ON IMAGE FOR FULL SIZE VIEW (3824x2613) Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 1 and 4 January 2022, Camera: ASI294MM (Baader Ha, RGB, ZWO OIII filters) Exposure:
Exposure: Ha - 64 x 4 min (gain-180 2x2), OIII - 64 x 4 min (gain-180 2x2)
, RGB -20 x 3 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 - Star XTerminator. Curves, Levels, stars RGB combine,
stars Luminance
layering - PixInsight. Color 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
4144x2822 resolution. Final
Image size is approximately 3824x2613. North is up in this image. This
image shows the emission nebula Sh2-284 (also known as LBN 983 - including LBN
984) . There are other LBN objects present (LBN 986, and 987). All of these LBN's
have similar cataloged coordinates - likely because in Lynds original paper
gives only rough locations. However, Lynds provided other information such as
size and brightness. Sh2-284 is estimated to be about 17,000 light
years distant in the Milky Way's outer arm (Norma). There are some IR
bubbles, [HKS2019] E80 and E84, that we can see evidence of because they have a
visible spectrum emission. 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 1.39 arcsec/pix. Image center is approximately - Equatorial 2000: RA: 06h 45m 25s Dec: +00°18'33"
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