Re: APPM plate solve anomaly

Ray Gralak


I think there is a bug in ASCOM 6.5 beta. That would explain why going back to didn't help. Luckily your data is not corrupted by this.

What's happening is that the ASCOM precession object looks like it can be initialized exactly once. For efficiency's sake APCC reuses the same object so all of the plate solves in your screen shot have the same RA/Dec and thus some huge offsets. The behavior is probably not expected but I haven't had a chance to look into this.

-Ray Gralak
Author of APCC (Astro-Physics Command Center):
Author of PEMPro V3:
Author of Astro-Physics V2 ASCOM Driver:

-----Original Message-----
From: [] On Behalf Of Gary Steffens via
Sent: Tuesday, June 16, 2020 3:42 PM
Subject: Re: [ap-gto] APPM plate solve anomaly

Hi Ray,

Thanks for the reply. I recently installed 6.5, so that is probably the cause. I'll install 6.4 SP1 and will let you
know if that solves the problem.


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