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M33 (Triangulum) with Emission Structures in HaO3



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA,  Dates: 8, 15 September , 15 October 2023,  Camera: ASI2600MM (Astronomik type 2c Ha OIII, LRGB, filters)

Exposure: Ha - 84 x 3.5 minutes (gain-160 1x1),  OIII  - 83 x 3.5 minutes (gain-160 1x1), Luminance - 124 x 3 minutes (gain-101 1x1), RGB - 40 each x 2 minutes  (gain-101 1x1).

Processing: Data Collection -  N.I.N.A (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine, Winsorized  Clipping Rejection, 2x drizzle for Lum, Ha, OIII) - PixInsight (WBPP).  MMT noise reduction - PixInsight.  Non-linear stretching, background normalization and gradient removal - PixInsight. Curves, Levels, RGB combine, Luminance layering - PixInsight. Generation of starless Ha, OIII, Luminance stacks for later processing - StarXTerminator. Photometric RGB calibration (SPCC) - PixInsight.  De-convolution - BlurXTerminator.  Final finishing  - Affinity Photo.  Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a LRGB with luminance layering.  Image processed at 8496x5752 (cropped) resolution. Final Image size is approximately 6800x4604.

North is to the right in this image. M33 (Triangulum Galaxy, NGC 598) is relatively close at about 2.73million light years and is classed as SA(s)cd. Of the two large and relatively close galaxies, M33 is smallest at about 61,000 light years in diameter; our Milky Way galaxy is about 87,000 light years; M31 (Andromeda Galaxy) is the largest in the Local Groups at about 152,000 light years.  M33 is a well studied galaxy and has many prominent emission structures with multiple survey catalogs of these structures. The annotated image shows groupings of these emission structures  - it focuses on four of these catalogs (BCLMP, CPSDP, [LHK2017], and [RVP2013]). There are also emission structures of M33 in the NGC and IC catalogs -  most notable of these is NGC 604 - a big bright emission structure. There are several background galaxies and Quasars in this image that can be seen in the full size and annotated images. These objects, information, and in particular the emission structures  are identified in the annotated image as well as some of the brighter Milky Way stars. Horizontal FOV is approximately 1.38 degrees. Full size image scale is approximately 0.73 arcsec/pix..  

Image center is approximately - Equatorial 2000: RA: 1h 33m 41s Dec: +3039'28" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2024

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