Contains: NGC 7380
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NGC 7380: Wizard Nebula RGBHa

Technical card

Resolution: 2826x1900

Dates: June 28, 2017July 3, 2017July 10, 2017

Frames:
ZWO Blue: 71x150" (gain: 150.00) -20C
ZWO Green: 28x150" (gain: 150.00) -20C
ZWO H-alpha 7nm: 46x300" (gain: 150.00) -20C
ZWO Red: 18x150" (gain: 150.00) -20C

Integration: 8.7 hours

Avg. Moon age: 10.17 days

Avg. Moon phase: 65.43%

Astrometry.net job: 1647087

RA center: 341.763 degrees

DEC center: 58.103 degrees

Pixel scale: 0.919 arcsec/pixel

Orientation: 101.040 degrees

Field radius: 0.435 degrees

Description

EDIT: The problems I described below vanished when I pointed my filter wheel inward towards the back of the scope. It looks like gravity was just too much for the spacers I had on it and that my problems were not due to focuser sag or tube flex. I've since replaced the spacers between the coma corrector and the filter wheel, going from three to two and using thicker ones as well. I'm betting this will solve my problems.

Original post:
I've been having a lot of problems with collimation - I think my camera simply weighs too much for my focuser. Everything squares up perfectly with a laser and cheshire, but once my camera is on, everything is out of whack. Even collimating off a star is impossible. Star shapes particularly at the right side are terrible in this image. I'm not sure what the solution is other than to replace the focuser, which is out of budget at the moment.

I was planning on doing a SHO version of this - I shot my oxygen, but don't have sulfur yet. I'm debating leaving it alone for now. On the other hand, I still haven't really done a full SHO image aside from a draft of M1. I would like to complete at least one...

Comments

Author

Chris Sullivan
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Revisions

D

Tighter crop.

G

This is a tighter crop than I wanted, but I really didn't like the orientation of the original version. I really messed up on framing this one - it's a good reminder to always check what Stellarium and plate solving give you. Sometimes, it's way off-center, and starting off with faint blue, green or oxygen III is not necessarily going to show you what the framing looks like. Note to self: take a hydrogen alpha frame on hydrogen alpha-heavy targets, even on moonless nights.

Sky plot

Sky plot

Histogram

NGC 7380: Wizard Nebula RGBHa, Chris Sullivan