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Contains:  M 81, Bode's nebulae, NGC 3031
Getting plate-solving status, please wait...
M81 - LRGB - somewhat rushed, 


M81 - LRGB - somewhat rushed

M81 - LRGB - somewhat rushed

Technical card

Resolution: 1952x2616

Dates:Feb. 5, 2018

Frames:Astronomik RGB Deep Sky: 141x30" -20C

Integration: 1.2 hours

Flats: ~120

Bias: ~200

Avg. Moon age: 20.08 days

Avg. Moon phase: 71.34%

Bortle Dark-Sky Scale: 7.00

Mean FWHM: 3.00

Temperature: 5.00 job: 1923949

RA center: 9h 56' 9"

DEC center: +69° 4' 1"

Pixel scale: 1.027 arcsec/pixel

Orientation: 272.196 degrees

Field radius: 0.465


First light for the Celestron OAG w/174 guide camera. Worked well, guiding was consistent, 0.65-0.7.

Clouds were due, so I cut everything short, and binned the color 2X2. Not bad for 1.2 hours in Bortle 7 skies. A bit noisy, pushed noise reduction as far as I could.

Details (easier than using astrobin). L - 57X45, R -25X20, G - 35X20, B- 24X25.

Just found it the irregular patch above M81 is Holmberg IX or PGC 28757, an irregular galaxy that's a companion to M81.



License: None (All rights reserved)

Sky plot

Sky plot


M81 - LRGB - somewhat rushed,