locked Re: #APCC APCC/APPM blocking issue with AP1100GTOAE #APCC


Dale Ghent
 

If one is using ASTAP with long focal length telescopes, there is this *very* important tidbit in the ASTAP documentation:

• For telescope with a small field of view <20 arcmin you could download the installer G18 up to magnitude 18 or a zipped G18 star database for manual install. at the program directory c:\program files\astap. Remove the G17 files or force use of the G18 in ASTAP. tab alignment.

Excuse the broken English but what it basically means is that you need the larger G18 database instead of the smaller G17 star database if you're operating at a tight FoV, on the order of 20 arc minutes or less. Despite being only 1 magnitudes of difference, the G18 database is almost twice the size of the default G17 database and weighs in around 1GB in size. This means more stars for ASTAP to make quads against given a small FoV. Obviously telescopes with wider FoVs will contain more brighter stars in their images which is why the G17 database is adequate enough for most.

/dale

On Sep 26, 2020, at 2:02 PM, Brian Valente <bvalente@gmail.com> wrote:

If the image area is smaller, for example because of a longer focal length, it may be more of a challenge.
we're at 0.63"/pix and APPM+pinpoint has worked great

When we do a sky model with around 270 points, we might get <5 failed plate solves



On Sat, Sep 26, 2020 at 10:04 AM Ray Gralak <groups3@gralak.com> wrote:
Voyager uses ASTAP natively and it works like a champ. APPM doesn't solve repetitively enough for me to be
concerned about it.
I don't even understand what that means?

APPM does not natively plate solve. It uses an external plate solver. It simply reads the RA/Dec and other values from the solver,
or intermediary app.

For plate-solving I typically use PinPoint and all-sky backup to Astrometry.Net. I've done many thousands of plate solves. Maybe
even hundreds of thousands. Unless there is a tree, clouds, or something else obscuring the sky, plate solves have been extremely
reliable at the image scale I typically use (around 1.6 arc-sec/pixel). That said, PinPoint can have problems in areas of the sky
where there are too many stars in the selected database, typically around the milkyway.

If the image area is smaller, for example because of a longer focal length, it may be more of a challenge.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Bill Long
Sent: Saturday, September 26, 2020 9:48 AM
To: Ray Gralak; main@ap-gto.groups.io
Subject: Re: [ap-gto] #APCC APCC/APPM blocking issue with AP1100GTOAE

Voyager uses ASTAP natively and it works like a champ. APPM doesn't solve repetitively enough for me to be
concerned about it.

________________________________

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Ray Gralak <groups3@gralak.com>
Sent: Saturday, September 26, 2020 9:26 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] #APCC APCC/APPM blocking issue with AP1100GTOAE

It could be as simple as the fact that APPM is doing a large number of plate solves in a short period of time.
I hope that's not true because it might make ASTAP a poor choice for plate solving.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center):
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-
pro&amp;data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa
%7C1%7C0%7C637367343966191971&amp;sdata=L5NWYJiNctTmuNFXvB37zZINb6CJ57eCgg7MyuWklfw%3D&
amp;reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-
physics.com%2Fapcc-
pro&amp;data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa
%7C1%7C0%7C637367343966191971&amp;sdata=L5NWYJiNctTmuNFXvB37zZINb6CJ57eCgg7MyuWklfw%3D&
amp;reserved=0>
Author of Astro-Physics V2 ASCOM Driver:
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&;d
ata=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0
%7C637367343966191971&amp;sdata=L0AH7Z1UH%2FJv8TKH4hHT4xKWMZHMWDSKLJQbgVhwQsg%3D&am
p;reserved=0
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&;
data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C
0%7C637367343966191971&amp;sdata=L0AH7Z1UH%2FJv8TKH4hHT4xKWMZHMWDSKLJQbgVhwQsg%3D&a
mp;reserved=0>


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of W Hilmo
Sent: Saturday, September 26, 2020 8:50 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] #APCC APCC/APPM blocking issue with AP1100GTOAE

I agree.

I suspect that it's an ASTAP problem, but something that APPM is doing is exposing it. It could be as simple as
the
fact that APPM is doing a large number of plate solves in a short period of time. As I mentioned, I've not had time
to do any investigation at all yet.

-----Original Message-----
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Ray Gralak
Sent: Friday, September 25, 2020 6:52 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] #APCC APCC/APPM blocking issue with AP1100GTOAE

I switched to ASTAP for my plate solves with SGP and am seeing what is
probably the same issue described in the first post of this thread.
APPM doesn't know which plate solver is in use when SGPro is used for plate solving. APPM operates the same
way for all SGPro plate solvers because APPM uses the SGPro API for plate solving. Since PlateSolve2 doesn't
seem to show the same problem, it seems likely that the problem is with how SGPro handles ASTAP.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center):
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-
pro&amp;data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa
%7C1%7C0%7C637367343966191971&amp;sdata=L5NWYJiNctTmuNFXvB37zZINb6CJ57eCgg7MyuWklfw%3D&
amp;reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-
physics.com%2Fapcc-
pro&amp;data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa
%7C1%7C0%7C637367343966191971&amp;sdata=L5NWYJiNctTmuNFXvB37zZINb6CJ57eCgg7MyuWklfw%3D&
amp;reserved=0>
Author of Astro-Physics V2 ASCOM Driver:
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&;d
ata=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0
%7C637367343966191971&amp;sdata=L0AH7Z1UH%2FJv8TKH4hHT4xKWMZHMWDSKLJQbgVhwQsg%3D&am
p;reserved=0
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&;
data=02%7C01%7C%7C5d031ac0f6f64c67c2a908d86238f03c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C
0%7C637367343966191971&amp;sdata=L0AH7Z1UH%2FJv8TKH4hHT4xKWMZHMWDSKLJQbgVhwQsg%3D&a
mp;reserved=0>

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf
Of W Hilmo
Sent: Friday, September 25, 2020 9:29 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] #APCC APCC/APPM blocking issue with AP1100GTOAE

I switched to ASTAP for my plate solves with SGP and am seeing what is
probably the same issue described in the first post of this thread.
























--
Brian



Brian Valente
portfolio brianvalentephotography.com

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