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Sharpless 249 Region - Gemini



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA,  27 December 2016  Camera: ST8300M (Baader Ha LRGB filters)

Exposure: Exposure:  12 x 10 min (1x1 bin) exposure with IR/UV Block filter, 13 x 10 min (2x2 bin) exposure with H-Alpha filter, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, and gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The H-Alpha filter exposure was screen blended into the IR/UV Blocking filter exposure stack and used for the luminance layer. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is up in this image.   The central attraction in this image is the emission / reflection nebula known as Sharpless 249. It is also known as LBN 841. The region has a general pervasive emission nebulasity. There are several dark nebula in and around this emission region. From Lynds Dark Nebula Catalog are LDN  1565, 1566, 1567, and 1568. Also in the upper right  are the reflection Nebulae vdB 75 and IC 444 (also known as CED 74 and LBN 840).  These objects  are identified in the annotated image. Just outside the image frame to the lower right is the popular target IC 443 (the Jellyfish) supernova remnant and just below the frame is the bright star Mu Geminorum (common name - Tejat).  Horizontal FOV is 85'

Image center is located approximately - Equatorial 2000: RA: 06h 23m 02s Dec: +2318'26" 


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