Strange artefact - help needed!
Re: Strange artefact - help needed!
If you haven't done so, weeding out the subs might improve things. I think Che is correct. Looks like a bump or some other mechanical interference.
Re: Strange artefact - help needed!
It was guided but unfortunately there were problems with the DEC axis that night (since resolved) and those are actually the better subs. The bad ones were awful:
Ursa Major is getting a bit low, so next spring before I can get some more data
Ursa Major is getting a bit low, so next spring before I can get some more data
Skywatcher 190MN, ASI 2600 or astro modded Canon 700d, guided by OAG, ASI120, PHD2