Re: AP1600 and Lunar Tracking Rate

Jack Huerkamp



Thank you.  I am looking at trying out APCC Horizons to see if that will help out with better lunar tracking.


Yours truly,




Jack Huerkamp

Jack's Astro Accessories, LLC

38388 Pine Street

Pearl River, LA 70452-5192



30.37N  89.76W


All of us get lost in the darkness.
Dreamers learn to steer by the stars.

………………………………….Neil Peart




From: <> On Behalf Of Roland Christen via
Sent: Monday, May 16, 2022 1:29 PM
Subject: Re: [ap-gto] AP1600 and Lunar Tracking Rate


The Lunar rate is an average rate in RA only. You would need a custom rate for both axes to follow the Moon precisely.




-----Original Message-----
From: Jack Huerkamp <Mallincamusa@...>
Sent: Mon, May 16, 2022 12:24 am
Subject: [ap-gto] AP1600 and Lunar Tracking Rate

Tonight, I was using a 16" RC at f/6.4 with a full frame sensor to watch the eclipse.  I also had a 91mm scope riding parallel to provide a wider FOV.  In the 16", I could see about 95% of the lunar disk.  But I constantly had to move the scope in the North direction as the Moon kept dropping down in the FOV.  The mount is permanently mounted in my observatory and polar aligned.  I verified this with my PoleMaster the other night.  I know the Moon's motion varies from day to day, but I would have assumed that the lunar rate would take that into account.  Do I have to guide on a small lunar crater to keep the Moon centered in the FOV?

Jack Huerkamp

Roland Christen


Join to automatically receive all group messages.