Contains: NGC 3077, M 82, NGC 3034, M 81, Bode's nebulae, NGC 3031, NGC 2976
Getting plate-solving status, please wait...

M81 and M82

Technical card

Imaging telescope or lens: William Optics Star 71 f/4.9

Imaging camera: ZWO Optical ASI071MC-Pro

Mount: Celestron Advanced VX

Guiding telescope or lens: Orion Guidescope 60mm

Resolution: 2861x1767

Dates: Feb. 23, 2018

Frames: 25x600" -5C bin 1x1

Integration: 4.2 hours

Darks: ~10

Flats: ~40

Bias: ~40

Avg. Moon age: 7.55 days

Avg. Moon phase: 51.82%

Bortle Dark-Sky Scale: 4.00 job: 1963156

RA center: 149.134 degrees

DEC center: 68.705 degrees

Pixel scale: 2.858 arcsec/pixel

Orientation: 61.851 degrees

Field radius: 1.335 degrees


A revisit of old companions, but what a challenge...

The final image is heavily cropped, maybe only 20% used, mainly to please the eye and make it a bit more interesting. Multiple attempts were needed by me to get some detail from M81, M82, etc and inbetween not destroying something else, so several different masks were needed to get at least a bit of "proper looking image" that I marked as reasonable.

Hope you enjoyed the result as well. Until a future re-attempt via the 8" SCT or WO71.




Sky plot

Sky plot


M81 and M82,