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NGC 1999, vdB 46, IC 340



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA,   14, 16 January 2021  Camera: ASI1600M (Astronomik Gen 2  Ha LRGB Filters)

Exposure:  33 x 6 min (1x1 bin, gain 200) Luminance exposures, 35 x  7min (1x1 bin, gain 240) Ha exposures , 12 x 4 min (1x1 bin, gain 139) 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. Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images (Luminance and Ha) - starnet++. RGB combine, Luminance layering - PixInsight. Stars and Starless  combine - PixInsight. Final finishing - Affinity Photo. RGB photometric calibration - PixInsight.  Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is an "off road" process treatment with starless Ha and Luminance/Blue combined in pixel math. The starless mix  was then combined with an RGB stars-only with pixel math. Images processed at 4656 x 3520 resolution. Final Image size is approximately 4000x3000.

North is up in this image. This field is just south of the well know Orion nebula. The more notable objects in this image NGC1999 (also cataloged  as vdB 46, LBN979), IC 430, and LDN 1641. It is an active star forming region and there are many young stellar objects and Herbig-Haro nebulosity (associated with newborn stars). It is a very active region and only the major items fit on the annotation.  These objects and some of the brighter stars are identified in the annotated image. NGC 1999 (vdB 46) and  associated star (BD-06 1253) is about 1,600 light years distant Horizontal FOV is about 115.  Full size image scale is  about 1.73 arcsec/pix. 

Image center is approximately - Equatorial 2000: RA: 05h 37m 42s Dec: -06 47' 09" 


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

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