Russell Croman Astrophotography  



The Nebulas of Spiral Galaxy M33

About This Photograph

Here is a unique photograph of spiral galaxy M33. Narrow-band exposures through hydrogen, sulfur, and oxygen filters were "continuum subtracted" with exposures through red and blue filters to remove almost all of the light from the stars of the galaxy, leaving only its beautiful collection of nebulas. These are vast clouds of gas lit up by newborn stars, not unlike our Milky Way's own such treasures. These nebulas generally trace the spiral arms of the galaxy, and increase in density toward the center due to the increased density of gas. The colors represent the different elements present: red for hydrogen, yellow for sulfur, and blue for oxygen.


Technical Details

Optics:Takahashi FSQ-106 EDX4, PlaneWave 14" CDK
Mount:Paramount MX+, Paramount ME II
Filters:Chroma R, G, B, and 3nm [SII], H⍺, [OIII]
Dates/Times:6 December 2020 - 11 February 2021
Location:RC-Astro North Observatory at New Mexico Skies
Exposure Details:49.5 hours total
Acquisition:MaxIm DL 6, ACP Expert
Processing:PixInsight, Photoshop