Barnard 216 217 218
CLICK ON IMAGE FOR FULL SIZE VIEW (2800x2100)
Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley CA, 27 December 2016 Camera: Atik 383 (Astronomik Gen II LRGB filters)
Exposure: Exposure: 17 x 12 min, (1x1 bin) exposure with UV/IR block, 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 and equalization, rough color calibration, gradient removal - Astroart. Curves, Levels, RGB combine - ImagesPlus, Luminance layering and finishing - Photoshop. This image is an LRGB combine with Luminance layering. Final color calibration - eXcalibrator. The Luminance construction was the Luminance exposures. Color saturation in LAB color. Native image size - 3354x2529. Final Image size is approximately 2800x2100.
North is up in this image. This field lies within the constellation of Taurus. This image contains dark nebulae and star forming within the larger dark nebula structures of LDN1521 and TGU H1211 - these objects are 4 square degrees and 11 square degrees respectively which are much larger than this field (which is only 3 square degrees). This field has four Barnard clouds B213, B216, B217, B218 from upper right to lower left . Along this dark lane Are several other dark cloud objects from the Dobashi catalog as well as various parts of the TGU H1211 structure. On the lower left is the small LBN 788 / CED33 nebula along with associated T Tau type stars. In the upper right is the galaxy UGC 3024 nd the FS Tau B variable star with a small associated nebula. These objects , other dark nebulae, and some of the bright stars are identified in the annotated image. Horizontal FOV is 120'
Image center is approximately - Equatorial 2000: RA: 04h 23m 59s Dec: +26°37'00"
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