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Sharpless 280 in Monoceros



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 14 and 16 November 2021,  Camera: ASI294MM (Baader Ha, RGB, ZWO OIII filters)

Exposure: Exposure: Ha - 34 x 8 min (gain-300 2x2), OIII - 32 x 8 min (gain-300 2x2) ,  RGB -12 x 4 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 - PixInsight. Stars and Starless  Luminance combine - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  Bicolor narrow band image (modified HOO) with RGB stars.  Image processed at 4144x2822 resolution. Final Image size is approximately  4003x2726.

North is up in this image.  This image shows the emission nebula Sh2-280 . It is also known as LBN 970. There are other LBN ojects present (LBN 971, 972, and 973). All of these LBN's have the same cataloged coordinates - likely because in Lynds original paper gives only rough locations. However, Lynds provided other information such as size and brightness. Sh2-280 is estimated to be about 4900 to 5500 light years  distant. There are several smaller minor dark nebulae around Sh2-280   These objects and some of the brighter stars are identified in the annotated image. This image replaces and earlier image in the archives here. Horizontal FOV is approximately 90 arc minutes. Full size image scale is 1.35 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 06h 34m 40s Dec: +0229'32"


All images and content remain the property of Jim Thommes - copyright 2003 - 2021

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