Contains: Triangulum galaxy, M 33, NGC 598
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M33 Mosaic

Technical card

Imaging telescope or lens: 127ED

Imaging camera: SBIG ST-8300M

Mount: Astro-Physics AP900

Guiding telescope or lens: 127ED

Guiding camera: SBIG ST-i

Software: PixInsightMaxim DL

Filters: Astrodon Ha 3nmAstrodon Lum G2EAstrodon Blue G2EAstrodon Green G2EAstrodon Red G2E

Accessory: SBIG OAG-8300

Resolution: 4176x3186

Dates: Oct. 7, 2012Oct. 13, 2012Oct. 14, 2012Oct. 15, 2012Oct. 17, 2012Oct. 21, 2012Nov. 10, 2012Nov. 11, 2012

Astrodon Blue G2E: 20x600" bin 1x1
Astrodon Green G2E: 20x600" bin 1x1
Astrodon Ha 3nm: 44x1800" bin 1x1
Astrodon Lum G2E: 60x600" bin 1x1
Astrodon Red G2E: 20x600" bin 1x1

Integration: 42.0 hours

Avg. Moon age: 21.00 days

Avg. Moon phase: 17.23% job: 93194

RA center: 23.461 degrees

DEC center: 30.655 degrees

Pixel scale: 1.170 arcsec/pixel

Orientation: -90.031 degrees

Field radius: 0.854 degrees

Locations: Portal, AZ, Portal, Arizona, None; Antennas Observing Site, Salome, Arizona, United States; Home, Goodyear, Arizona, United States


I shot 21 hours of Hydrogen Alpha data in an effort to bring out the numerous HII regions that populate the spiral arms of M33. In the final image processing, I separated large scale structures from the smaller scale structures and processed them independently before recombining them in the final image. I did this so that I could place emphasis on the shape of the spiral arms in the galaxy when processing the large scale structures. These tend to get lost in most deep images from the glow over the center of M33. I wanted the image to show the spiral structure in much the same way that I see it in the eyepiece in larger aperture telescopes.

I wanted to also include the sky around M33 for a little bit of context, so I shot this as a 2 frame mosaic. The final image after cropping is 14 megapixels.



Mike Wiles

Sky plot

Sky plot


M33 Mosaic, Mike Wiles