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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205
Getting plate-solving status, please wait...
M31-Andromeda Galaxy, 


            John K Greathouse
M31-Andromeda Galaxy

M31-Andromeda Galaxy

Technical card

Resolution: 4197x2753

Dates:Sept. 11, 2015Sept. 15, 2015Sept. 17, 2015

Hutech IDAS LPS D1 2" Hutech IDAS LPS-D1: 19x300" ISO800 16C bin 1x1
Hutech IDAS LPS D1 2" Hutech IDAS LPS-D1: 27x480" ISO800 17C bin 1x1

Integration: 5.2 hours

Darks: ~34

Flats: ~18

Bias: ~360

Avg. Moon age: 11.23 days

Avg. Moon phase: 7.51%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 17.69

Mean FWHM: 4.27

Temperature: 13.50 job: 795447

RA center: 10.687 degrees

DEC center: 41.263 degrees

Pixel scale: 1.666 arcsec/pixel

Orientation: -90.537 degrees

Field radius: 1.162 degrees

Locations: "Patio Observatory" in my backyard, Columbus area, Ohio, United States


This one was tricky. Looks like 480 second exposures with my 450D is just about the limit at a sensor temperature of 70F. I had a lot of problems with banding and it took a lot of work to get rid of them. The final image is clipped a bit on the dark end of the histogram. I may have to play with the band reduction process I used to see if I can avoid that in the future.



John K Greathouse
License: None (All rights reserved)

Sky plot

Sky plot


M31-Andromeda Galaxy, 


            John K Greathouse