Contains: NGC 5195, Whirlpool galaxy, M 51, NGC 5194, IC 4263
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M51

Technical card

Resolution: 1824x1216

Dates: Feb. 18, 2017Feb. 19, 2017Feb. 20, 2017Feb. 24, 2017

Frames:
ZWO Blue: 21x150" (gain: 150.00) -25C
ZWO Green: 100x150" (gain: 150.00) -25C
ZWO H-alpha 7nm: 30x300" (gain: 150.00) -25C
ZWO Luminance: 135x150" (gain: 129.00) -25C
ZWO Red: 24x150" (gain: 150.00) -25C

Integration: 14.2 hours

Darks: ~40

Flats: ~9

Avg. Moon age: 23.91 days

Avg. Moon phase: 34.05%

Astrometry.net job: 1732768

RA center: 202.469 degrees

DEC center: 47.191 degrees

Pixel scale: 1.512 arcsec/pixel

Orientation: 71.274 degrees

Field radius: 0.460 degrees

Description

I might try to capture more blue and/or hydrogen alpha data on this.

Comments

Author

Chris Sullivan
Like

Revisions

B

Reduced star sizes and adjusted the levels a bit to make the background darker.

C

Tried a different method of luminance layering. NGC 5195 seems less yellow and more blue - I'm not sure why.

D

I found my missing blue subs as well as a bunch of hydrogen alpha subs! Now it's looking like I hoped it would.

E

Crop of revision D.

F

Adjusted the reds a little.

G

Crop of revision F.

H

Reduced the amount of Ha in the red channel and tried to fix a minor acquisition error (50% successful).

I

Adjusted levels.

J

Trying to fix the reflection error once and for all...

K

Attempt to repair a minor error in the red channel.

L

Continuing to reprocess old data. I got a comment recently that this one was too red, which it was.

Sky plot

Sky plot

Histogram

M51, Chris Sullivan