M33 - The Triangulum Galaxy Reimagined with HaRGB Processing

Get ready to be captivated by the intricate beauty of M33, the Triangulum Galaxy, as showcased in this newly reprocessed HaRGB image. This particular dataset, originally captured in 2022, has been given a fresh lease on life with a refined processing workflow that beautifully merges broadband and narrowband data.

This celestial masterpiece is the result of a meticulous process, combining the clarity of broadband imaging with the rich hydrogen-alpha detail from narrowband filters. The goal was to create a vibrant and detailed representation of this spiral galaxy, and the outcome is nothing short of spectacular.

The Technical Details: Capturing the Cosmos

The journey to this stunning image involved a significant amount of dedication and precise execution. Here's a breakdown of the acquisition details:

• Total Integration Time: 19 hours
• Sub-exposure Length: 180 seconds

Data Breakdown:

• Broadband: 200 x 180s exposures using an Astronomik L-3 UV/IR cut filter.
• Dual Narrowband: 180 x 180s exposures with an Optolong L-Enhance Dualband Filter.

Equipment Used:

• Telescope: SkyWatcher Evolux 82-ED
• Camera: ZWO ASI533PRO MC
• Guiding Camera: ZWO ASI120
• Mount: Celestron AVX EQ Mount
• Guide Scope: Omegon Microspeed guide scope 60mm

Filters:

• Astronomik L-3 UV/IR Cut 2"
• Optolong L-Enhance 2" Dualband Filter

The Art of Processing: Bringing M33 to Life

Stacking was performed in DeepSkyStacker (DSS), laying the groundwork for the detailed processing in Pixinsight. The workflow involved several key steps to bring out the best in the captured data:

RGB Processing:

• DynamicCrop
• PCC (Photometric Color Calibration)
• StarXTerminator
• EzSoftstretch

Ha Processing:

• EzSoftstretch
• RangeSelection

Combining Data:

A crucial step involved masking the RGB image using the Ha data. The Ha signal was then integrated into the RGB image using a formula, crediting VisibleDark for the technique. Following this, CurvesTransformation was applied to refine the overall color and contrast.

Star Enhancement:

Stars were handled separately with HistogramTransformation and further CurvesTransformation to ensure they complemented the galaxy's structure without overpowering it.

Final Touches:

Pixelmath was employed to reintroduce the processed stars to the HaRGB composite, resulting in the final breathtaking image. The process also involved using Pixelmath to process stars from the RGB data, applying HistogramTransformation to them.

This image is a testament to the power of combining different imaging techniques and advanced processing software. The result is a detailed and visually stunning view of the Triangulum Galaxy, inviting us to explore the wonders of our universe.