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Contains:  NGC 5477, M 101, NGC 5457
Getting plate-solving status, please wait...
M101 Lum Data, 


            Tom Butts
M101 Lum Data

M101 Lum Data

Technical card

Resolution: 4410x3906

Dates:May 7, 2018May 13, 2018

IDAS 2" LPS D2: 70x180" (gain: 139.00) -15C bin 1x1
IDAS 2" LPS D2: 150x60" (gain: 139.00) -15C bin 1x1

Integration: 6.0 hours

Darks: ~15

Flats: ~15

Bias: ~50

Avg. Moon age: 24.49 days

Avg. Moon phase: 30.40%

Bortle Dark-Sky Scale: 8.00 job: 2075920

RA center: 210.802 degrees

DEC center: 54.350 degrees

Pixel scale: 0.700 arcsec/pixel

Orientation: 34.343 degrees

Field radius: 0.573 degrees

Locations: Home, Burlington, Ontario, Canada

Data source: Unknown


It's been a challenging few weeks to gather what isn't a lot of data. I've been fighting with gear malfunctions and weather. This is composed of guided 180s exposures with 60s unguided exposures as I'm having issues with my autoguider.



Tom Butts
License: Attribution-NonCommercial Creative Commons


  • M101 Lum Data, 


            Tom Butts
  • Final
    M101 Lum Data, 


            Tom Butts


Different processing techniques. Added 1.5hrs of Lum. Onto RGB and Ha before it's behind the trees.

Sky plot

Sky plot


M101 Lum Data, 


            Tom Butts