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Contains:  M 82, NGC 3034, M 81, Bode's nebulae, NGC 3031
Getting plate-solving status, please wait...
M81/M82 LRGB test run, 


            Pam Whitfield
M81/M82 LRGB test run

M81/M82 LRGB test run

Technical card

Resolution: 3278x2350

Dates:April 10, 2019

Optolong Blue 36mm: 17x180" -15C bin 2x2
Optolong Green 36mm: 18x180" -15C bin 2x2
Optolong Lum 36mm: 17x600" -15C bin 1x1
Optolong Red 36mm: 18x180" -15C bin 2x2

Integration: 5.5 hours

Darks: ~37

Flats: ~25

Bias: ~25

Avg. Moon age: 5.00 days

Avg. Moon phase: 25.77% job: 2889596

RA center: 148.886 degrees

DEC center: 69.327 degrees

Pixel scale: 1.589 arcsec/pixel

Orientation: 94.962 degrees

Field radius: 0.890 degrees

Locations: Local Garden, Sisden, West Yorkshire, United Kingdom

Data source: Backyard


Happy days are here again! :-)
At long last I think I have a handle on the technical glitches that have been making my imaging sessions miserable and frustrating over the past number of months. It's been quite some time that I've been able to leave the scope unattended with a decent expectation that it will run through without a disconnection issue (and it wasn't anything to do with QHY drivers!).
I was a bit surprised that I haven't done M81/M82 since I got the CCD, but seeing as as they are overhead at the moment it seemed as good a time as any. Broadband flats aren't the best as the flat-field generator isn't very uniform at its lowest brightness but the mechanical shutter on the QHY9 needs longer exposures - not an ideal combination.

Lum 17x600s 1x1
R 18x180s 2x2
G 18x180s 2x2
B 17x180x 2x2



Pam Whitfield
License: None (All rights reserved)


  • M81/M82 LRGB test run, 


            Pam Whitfield
  • M81/M82 LRGB test run, 


            Pam Whitfield
  • Final
    M81/M82 LRGB test run, 


            Pam Whitfield


Trying out a denoise plugin so a quick play with the original stack to improve colour


OK - recombined the original FITS this time rather than trying to cheat. The Topaz Labs denoise plugin still does it's magic even when finding my way around in the new PSPro is getting a bit of getting used to....

Sky plot

Sky plot


M81/M82 LRGB test run, 


            Pam Whitfield

In these public groups

QHY Users Group