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Re: Best Way To Determine Periodic Error?

 

Hi Arun,

A bump won't ruin the synch.??
A rotation of the worm, without Gemini knowing about it, would ruin the synch.? And only the RA matters for this PE and PEC work.??

But really, just do the PE evaluation first. That's the most important?thing.? That will tell you if you need to fix something, or not even bother with PEC at all (that is possible!).??

Contact me off line if you need further guidance or want to talk through this.? I think these two PDFs (!! don't laugh) have links to the software that I discussed.??

Best wishes,
Michael



On Thu, Jul 2, 2020, 3:22 PM Arun Hegde <arun.k.hegde@...> wrote:
Hi Michael,?

Thanks for the very detailed write up. There is one thing? that your post clarified, which is how the PEC curve is synched to the current worm position. My follow up question is this: if the mount's RA axis is accidentally bumped after it has been shut down - which is very possible when we manually set up and tear down- will Gemini lose track of the worm position? I realize that when I restart, I can level the RA and DEC axes to set the CWD position again, but will using a level be sufficiently accurate to reproduce the CWD position at which the PE curve was generated? A different way of saying this - does Gemini know the absolute position of the RA worm??

Arun

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