Odd symmetric reflections (I think)

Wesley Mitchell

Hi

The two images below highlight stuff that shouldn't be there in Thor's Helmet. I wonder if it is a reflection, or some kind of light leak. It only seems to happen with my Ha filter.

Comments welcome

BlockHead

I think you are showing me calibrated data. Is the issue detectable in your raw data?

Does your flat have a dark thing in these positions?

My guess is that this stuff is from your flat field having some gunk that is creating an inverted image.

But of course...I do not have enough information. You need to tease out where it is coming from by looking at your darks, flats (especially) and raw data compared to calibrated data.

-the Blockhead

Wesley Mitchell

Thanks, Adam. All I asked for was a guess :D

The raw data doesn't seem to show it in Ha.

I re-processed using only the most recent couple of nights of flats, and the problem did not manifest :D

No gunk

yer pal

Wes

BlockHead

So... perhaps I was right? I do enjoy being right... lol

thanks for the update..

-the Blockhead