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Contains:  NGC 5198, NGC 5195, Whirlpool galaxy, M 51, NGC 5194, IC 4263, NGC 5173, NGC 5169
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Whirlpool Galaxy (M51) - RASA 11", 


            Dan Gallo
Whirlpool Galaxy (M51) - RASA 11"

Whirlpool Galaxy (M51) - RASA 11"

Technical card

Resolution: 3745x2462

Dates:May 2, 2019

Frames:Optolong L-Pro 2": 60x60" (gain: 120.00) -15C bin 1x1

Integration: 1.0 hours

Darks: ~100

Flats: ~100

Bias: ~100

Avg. Moon age: 27.17 days

Avg. Moon phase: 6.20%

Bortle Dark-Sky Scale: 7.00 job: 2675969

RA center: 202.471 degrees

DEC center: 47.211 degrees

Pixel scale: 1.543 arcsec/pixel

Orientation: 39.038 degrees

Field radius: 0.960 degrees

Locations: Home, Foster City, California, United States

Data source: Backyard


First light with my new RASA 11". Really impressed with it so far, and how well it seemed to hold focus through the imaging session, and smaller/sharper stars versus the HyperStar setup I had before. Some slight diffraction spikes, due to not properly routing the cables. Certainly a big and heavy scope to lift on to the mount (I have to setup each time!)

I had quite an obvious blue gradient on the lower left corner which DBE in PixInsight couldn't fix easily (think I need to work on my flats), so I just used Lightroom to apply a graduated filter to lower the black level and saturation on that corner of the image, which helped.

I like how I managed to capture some smaller (more distant) galaxies in the lower right corner of this image.



Dan Gallo
License: None (All rights reserved)

Sky plot

Sky plot


Whirlpool Galaxy (M51) - RASA 11", 


            Dan Gallo