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


Sharpless 284 in Monoceros



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 imageHorizontal 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: +0018'33"


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

Current Web Total Hits -

- Unique Visitors