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Heart Nebula Sh-190 IC1805



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 26 October and 6 November 2019,  Camera: Atik 383L (Astronomik Gen 2  Ha OIII LRGB Filters)

Exposure:  24 x 10 min (1x1 bin) Ha filter, 18 x 10 min (2x2 bin) OIII  filter, 8 x 5 min (1x1 bin) each RGB filters.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration and registration - PixInsight. Subframe integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images - starnet++.  Starless color mapping and LRGB stars color mapping - PixInsight. Stars and Starless combine - PixInsight. Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  modified HOO narrow band mapping with RGB stars.  Images processed at 3354 x 2529 resolution. Final Image size is approximately  3000x2250.

North is to the right in this image.  This image field is a close in composition of the "Heart Nebula"  (Sharpless 190)region.  This is an active star forming region with many young stellar objects. The haert Nebula encompases the full field of this image and a little beyond. At its heart is the nebulous star cluster IC 1805 (AKA Melotte 15, Collinder 26, and LBN 654) - within that is the dark nebula LDN 1369. This star cluster / nebulosity structure is about 6,150 light years distant. In the outer nebulosity regions are several LBN and LDN nebulae. There are also multiple dark nebulae from Dobashi and TGU catalogs - they are too numerous to annotate.  The star clusters within this field (in addition to IC 1805) are Berkeley 65 (7,416 light years), Tombaugh 4 (7,170 light years), and Czernik 10 (no distance estimate). These objects and some of the brighter stars are seen in the annotated image.  The horizontal FOV is 120'. Image scale of the full size image is 2.4 arcsec/pix. 

Image center is located approximately - Equatorial 2000: RA: 02h 33m 29s Dec: +6148'44"


All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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