M33 close view with a 180mm refractor in LRGB-Ha (Nicola Beltraminelli)

M33 close view with a 180mm refractor in LRGB-Ha

The Triangulum Galaxy is a spiral SA(s)cd type 2.73 million light years from Earth. The Messier object number 33, or 598 of the NGC catalogue, has a diameter of 61,100 light years and is the smallest spiral galaxy in the Local Group composed by our Milky Way and the Andromeda Galaxy. It is believed to be a satellite of the Andromeda on its rebound into the latter due to their interactions, velocities and proximity to one another in the night sky (source Wikipedia).

My objective was to immortalize M33 by providing a detailed view of the spirals, its core, as well as the very peculiar nebulas. I therefore recorded more than 200 subs with the L filter and retained only the ones with the lowest HFR values. During the processing, I noticed that, already by applying a moderate level of BXT, the stars of the spirals were significantly degraded. Therefore, I decided to not use it at all. The same applied for denoise, where even a very gentle use of denoising ended up with detrimental effects on the spirals. Also in this case, I decided to avoid using Denoise. At last, the generation of a starless version of the galaxy also ended up in compromising the image, thus strongly limiting the processing options.

As you can guess, I processed the image by gently playing with the contrasts and colors to avoid any excess, so to obtain an equilibrated result. The power of the optics and of the mound enabled me to obtained a well detailed image where the shape of the nebulas, the stars and their colors can be detected within the spirals of the galaxy.

As usual, don't hesitate to provide constructive input and options to optimize the result.

CS,

Nicola

B

Description: Slightly increased the luminosity

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Astrophotographes (France)
ASI 6200 MM Pro
Fine Art Astrophotography
Processed with Photoshop

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Status	Advanced success
Started	...
Astrometry.net job	8555194
PixInsight job	15E5ET22NO7KTT6PIYPR6HG2PSOL85MR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h33m51s.131
RA (top/left)	01h35m22s.269
RA (top/right)	01h35m55s.110
RA (bottom/right)	01h32m18s.828
RA (bottom/left)	01h31m48s.484

Dec (center)	+30°40′16″.11
Dec (top/left)	+30°03′21″.75
Dec (top/right)	+31°12′38″.16
Dec (bottom/right)	+31°17′13″.53
Dec (bottom/left)	+30°07′52″.13

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