Periodic error and Dec-Arc tracking.


Geoff Smith
 

When using Dec-Arc tracking for unguided imaging I presume that using PEC is absolutely necessary and that using the mount's native periodic error (ie no PEC) won't give decent results.
Just wondering.


Roland Christen
 

If you don't use PEC then the stars will wander back and forth by the amount of the PE error. So you will get an oval star image in the RA direction.

Roland

-----Original Message-----
From: Geoff Smith <ghsmith45@...>
To: main@ap-gto.groups.io
Sent: Thu, Sep 16, 2021 6:40 pm
Subject: [ap-gto] Periodic error and Dec-Arc tracking.

When using Dec-Arc tracking for unguided imaging I presume that using PEC is absolutely necessary and that using the mount's native periodic error (ie no PEC) won't give decent results.
Just wondering.

--
Roland Christen
Astro-Physics