Re: APPM Basic questions


Ray Gralak
 

My main question, as related to this night, was I could only model 2/3rds of the sky, and was wondering if using
that model was helpful, or pointless. I’ll hopefully find guidance in the help file tomorrow. Pulled it all in tonight, it
got “clear” but so hazy there was no point in imaging.
No one can tell you that because every setup is different. However, you can try using the model afterwards to see how it performs.

I do tear down completely. I try to reproduce the same setup by setting the tripod legs into drilled holes, but there’s
always some slop from wheeling it in and out, removing and reinstalling the OTA, etc. I have no faith a prior
model would be valid. Maybe I can do some on consecutive nights and see how they vary.
If you can reproduce the position of everything, especially polar alignment, then the model should be re-usable. Only be actually trying this will you know.

-Ray


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of ap@...
Sent: Saturday, August 7, 2021 9:55 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APPM Basic questions

Ray wrote:



* Have you already read the APCC help section for APPM? There's lots of information in there that can get
you started.



I read the manual (twice), but probably not the help file, I take it that’s different than the manual. Tomorrow...



My main question, as related to this night, was I could only model 2/3rds of the sky, and was wondering if using
that model was helpful, or pointless. I’ll hopefully find guidance in the help file tomorrow. Pulled it all in tonight, it
got “clear” but so hazy there was no point in imaging.



* If you don’t tear down or significantly change your setup, you can usually use the same model for many
nights. However, if the model starts to become inaccurate, then you may need to redo it. For example, if the polar
alignment changes because of mount settling, or the temperature change is significant enough to measurably
change equipment flexure.



I do tear down completely. I try to reproduce the same setup by setting the tripod legs into drilled holes, but there’s
always some slop from wheeling it in and out, removing and reinstalling the OTA, etc. I have no faith a prior
model would be valid. Maybe I can do some on consecutive nights and see how they vary.



* BTW, if it is just shifting polar alignment causing an issue, you might try tweaking polar alignment outside of
APCC (e.g. via PEMPro, SharpCap, PHD2, polar alignment scope, etc.). Then do a RECAL in APPM, and the
model should work well again.



I do a polar alignment first thing, either Sharpcap or NINA (they do agree).



Thanks for the response.



Linwood



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