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Thor's Helmet Narrowband

Technical card

Resolution: 3919x2789

Dates: March 13, 2017March 16, 2017March 19, 2017March 21, 2017March 23, 2017

Frames:
ZWO Blue: 13x60" (gain: 75.00) -25C
ZWO Green: 21x60" (gain: 75.00) -27C
ZWO H-alpha 7nm: 35x300" (gain: 150.00) -25C
ZWO H-alpha 7nm: 9x400" (gain: 150.00) -25C
ZWO OIII: 35x300" (gain: 150.00) -25C
ZWO Red: 22x60" (gain: 150.00) -25C

Integration: 7.8 hours

Avg. Moon age: 20.56 days

Avg. Moon phase: 62.31%

Astrometry.net job: 1731335

Comments

Author

Chris Sullivan
Like

Revisions

B

No new data - just tried a combination of methods for fixing the elongated stars due to the wind-ruined frames I shouldn't have used. It was moderately successful, but if I can get better data, I'll probably just leave the problem frames out.

C

Added more O3 frames and got rid of the problem frames. I still want to add more Ha frames and also do some RGB stars, but overall, I'm really pleased with how this one is coming out. I hardly did any processing on this.

D

Added another 13 subs of hydrogen alpha - it should have been 33, but the wind just won't leave me alone. I'd like to get a little more hydrogen alpha and some RGB for the stars. Hopefully that will work out for tomorrow, because next week looks like nothing but clouds.

E

This is with some green and blue subs added in to the O3 data. I think it helped the stars, but I'm not sure about the nebula. I'll gather some red data and more Ha and reevaluate.

F

Played around with the color balance and selective color as well as curves.

G

More modifications to curves and selective color.

I

Added more Ha along with RGB stars.

J

One last adjustment to the layers.

K

Tried a different method of getting the RGB star data in. It doesn't really look all that different.

L

Fixed the oversaturated background, adjusted levels, played with selective color a little and did some additional noise reduction.

M

I just learned a new way of increasing contrast, so I've been playing around with that. Also did some selective color modifications and reduced the levels, which I pushed too far in the last revision.

Histogram

Thor's Helmet Narrowband, Chris Sullivan