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NGC 1555 - Hind's Variable Nebula



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 19 December 2019,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 24 x 12min  (1x1 bin) exposure with UV/IR block filter,  8 x 5 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe  registration and integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images for later processing - starnet++. Curves, Levels, RGB combine, Luminance layering - PixInsight. Stars and Starless combine - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering.  Images processed at 3352 x 2532 resolution. Final Image size is approximately  3352x2514.

North is up in this image.  This image shows a region of interstellar material, Hydrogen, and dust illuminated by nearby stars. The central part of this image is NGC 1555 commonly known as Hind's Variable Nebula. The nearby illuminating / energizing star is T Tauri. This star is the prototype of a T Tau variable star - characterized by the surrounding variable nebula with its outbursts.  NGC 1555 is also known as SH2-238, Cederblad 32b and closely nearby vdB 28. In a broader but uncertain region around NGC 1555 is Struve's Lost Nebula (NGC 1554). It is believed to have been a brief outburst nebula at the time of Struve's observation and its location may be somewhat uncertain. Within this area is also LBN 817, Cederblad 32a, 32c , dark nebulae and a molecular cloud. These objects and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 88 arc minutes. Full size image scale is 1.57 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 04h 21m 56s Dec: +1922'53"


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