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Contains:  M 3, NGC 5272
Getting plate-solving status, please wait...
Great Balls of Fire!   M3, 


            Bob Stevenson
Great Balls of Fire!   M3
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Great Balls of Fire! M3

Technical card

Dates:May 21, 2020

L-Pro 2": 75x120" 0C bin 1x1
L-Pro 2": 118x180" 0C bin 1x1

Integration: 8.4 hours

Darks: ~30

Flats: ~40

Bias: ~30

Avg. Moon age: 28.38 days

Avg. Moon phase: 1.50%

Bortle Dark-Sky Scale: 8.00 job: 3547138

RA center: 13h 42' 10"

DEC center: +28° 22' 40"

Pixel scale: 0.236 arcsec/pixel

Orientation: 110.758 degrees

Field radius: 0.210 degrees

Resolution: 5114x3878

Locations: Backyard, Bortle Class 8, Burlington, Ontario, Canada

Data source: Backyard


I decided to try a globular cluster between the galaxies this spring, and M3 was well positioned for that. It was more frustrating to process than I thought it would be. Definitely less processing is better with these objects.

I combined shorter 120 second exposures with 180 second exposures for the luminance to try not to blow out the core as much.



Bob Stevenson
License: None (All rights reserved)

Sky plot

Sky plot


Great Balls of Fire!   M3, 


            Bob Stevenson