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Contains:  M 33, NGC 598, Triangulum galaxy
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M33 (Triangulum Galaxy), 


            Joel Shepherd
M33 (Triangulum Galaxy)
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M33 (Triangulum Galaxy)

Technical card

Dates:Sept. 26, 2017Sept. 27, 2017

Baader Planetarium B 1.25": 18x300" bin 1x1
Baader Planetarium G 1.25": 18x300" bin 1x1
Baader Planetarium L 1.25": 18x300" bin 1x1
Baader Planetarium R 1.25": 18x300" bin 1x1

Integration: 6.0 hours

Avg. Moon age: 6.39 days

Avg. Moon phase: 39.53%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details job: 1757228

RA center: 1h 33' 55"

DEC center: +30° 38' 38"

Pixel scale: 4.421 arcsec/pixel

Orientation: 92.065 degrees

Field radius: 0.971 degrees

Resolution: 1280x929

Locations: Home, Seattle, WA, United States

Data source: Backyard


Subject: M33 (Triangulum Galaxy): Located "just" 4 million light years away, Triangulum is roughly half the diameter of the Milky Way and has about a tenth of the stellar mass. The outer regions of the galaxy, particularly the pinkish areas indicating hydrogen concentrations, are likely star-producing regions.

Capture notes: At this time of year, decent weather is fleeting so I limited the capture to 90 minutes per channel and made a synthetic (or augmented) luminance by averaging the individual RGB stacks with the all-luminance stack. Moon was fairly low in the sky for most of the capture and the first night (R and B channels) was very clear.

Processing notes: Other than the synthetic luminance, I used a pretty ordinary LRGB workflow. Color is mostly via PixInsight's PhotometricColorCalibration, with a bit of saturation added by one application of curves.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


M33 (Triangulum Galaxy), 


            Joel Shepherd