M33 (Triangulum Galaxy) in LRGB+Ha (Derek Spratt)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: M 33 · NGC 595 · NGC 598 · NGC 604 · Triangulum Galaxy · Triangulum Pinwheel

M33 (Triangulum Galaxy) in LRGB+Ha, Derek Spratt

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M33 (Triangulum Galaxy) in LRGB+Ha

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M33 (Triangulum Galaxy) in LRGB+Ha

[Note: there are 2 versions of this image - the 'final' version has the Luminance layer reprocessed to bring the stars forward more as well as the faint outer galaxy arms - each version has its merits depending on what the viewer is focusing on]

I spent some time this fall trying to get enough exposures of M33 using both of my scopes (RC8 and RASA8) but the S/N ratios were not sufficient given my local conditions to bring out the details - this is a difficult target and the internet (and Astrobin) is filled with examples of over processed and artificial looking versions of this because we are all struggling with the same issues: M33 is relatively large and diffuse, there is a substantial amount of dust in the region, and the details are often swamped by the noise.

M33 is an important object: one of the nearest large galaxies, an intact spiral structure that has not been impacted negatively by tidal forces from other galaxies, many surprisingly active/dense H2 star forming regions, interesting dust lanes, and a number of other unusual structural elements to tease out of it.

I wanted to capture a lot of detail but not over process (or punch up the Ha regions too much which is commonly done to this target) so I used a CDK17 with a focal reducer and shot a 2 panel Mosaic. I am really happy with the result as it shows lots of detail over a large field of view with dust lanes in abundance, and the star field is also rich with stars of all colours and sizes, making it pretty from that perspective as well.

Original
Final
E

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Status	Basic success
Started	...
Astrometry.net job	8879723
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M33 (Triangulum Galaxy) in LRGB+Ha

M33 (Triangulum Galaxy) in LRGB+Ha

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M33 (Triangulum Galaxy) in LRGB+Ha

M33 (Triangulum Galaxy) in LRGB+Ha

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