APCC model like Mach2


Max Mirot
 

Ray,

When is the Dec arc tracking model coming out in APCC?
I would like trying with my AP1100

Thanks

Max Mirot


Ray Gralak
 

Hi Max,

That feature has been done for over 18 months, having been in successful beta-tests during that time. However, it will be bundled with a few other new features (like support for plate solves using ASTAP) that are still under test and development. I can't give you a specific date yet because progress depends on the weather and other factors.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Max Mirot via groups.io
Sent: Wednesday, March 17, 2021 8:56 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] APCC model like Mach2

Ray,

When is the Dec arc tracking model coming out in APCC?
I would like trying with my AP1100

Thanks

Max Mirot


skester@...
 

Am I correct that this feature is the same functionality Roland used via the keypad on the Mach2 to build a model only along the path of the target to be imaged?  If so that sounds like a big win for mobile imagers like myself.


Ray Gralak
 

Am I correct that this feature is the same functionality Roland used via the keypad on the Mach2 to build a model
only along the path of the target to be imaged? If so that sounds like a big win for mobile imagers like myself.
The implementations are independent of each other, but the concept is similar. APCC's Declination Arc Tracking is an idea I first had over 15 years ago. The feature does not use the typical model that you would find in TPoint or other premium mounts. It uses hybrid modeling: pointing correction is handled with a full-sky model, but tracking rate correction is dealt with via a different mathematical model that is optimized for localized tracking accuracy. The tracking rate modeling accounts for mechanical terms that the full-sky pointing model does not and thus produces higher tracking rate accuracy than a full-sky model.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of skester@gmail.com
Sent: Thursday, March 18, 2021 10:07 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APCC model like Mach2

Am I correct that this feature is the same functionality Roland used via the keypad on the Mach2 to build a model
only along the path of the target to be imaged? If so that sounds like a big win for mobile imagers like myself.


skester@...
 

Thanks Ray, one more question.  By 'hybrid model' I take it APCC needs both a full-sky model, and the Dec Arc model for the given target Dec.  In my use case I would need to build the full-sky model each night since I travel to image.  I don't really need pointing accuracy since I plate solve to the target.  What would be the minimum number of points required in the full-sky model to enable the Dec Arc Tracking functionality?

Thanks,
Scott


Ray Gralak
 

Scott,

The minimum is two rows of Declination arcs encompassing a target's declination, at least 6 points in each row. More points and more declination arcs near the target's declination will produce higher accuracy. If you are well polar aligned this should only take 5 minutes, maybe less.

BTW, APCC is already setup to do declination arcs by default, so it's pretty easy to define a declination arc range.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of skester@gmail.com
Sent: Friday, March 19, 2021 8:39 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APCC model like Mach2

Thanks Ray, one more question. By 'hybrid model' I take it APCC needs both a full-sky model, and the Dec Arc
model for the given target Dec. In my use case I would need to build the full-sky model each night since I travel to
image. I don't really need pointing accuracy since I plate solve to the target. What would be the minimum number
of points required in the full-sky model to enable the Dec Arc Tracking functionality?

Thanks,
Scott