Cannot Plate solve after meridian flip

[Alan Rockowitz]

I've been happily using ASTAP in NINA for some time now, and it seems to fail after a meridian flip every time. I focus before I solve, and I have let it settle for up to 10 minutes before attempting to solve, and it fails. Any ideas on what I can check?

[han.k]

Hello Alan,

For solving it doesn't matter if the image is turned around or flipped. so the meridian flip doesn't influence solving.

I can only guess what wrong at your setup:

1) To large offset after the flip. Could be a few degrees off but with 20 or 30 degree search range you fine.

2) My HEQ5 mount can't sync across the meridian. So solving works but mount syncing doesn't work till after maybe 5 or 10 minutes till it actually passed the meridian. so you should never flip exactly at the meridian. Better 30 or 40 minutes after. I assume you can set that in Nina (I use CCDCiel)

So check 1) search range of ASTAP as set in Nina and 2) check log for sync problems or better set meridian flip delayed.

Clear skies, Han

[Alan Rockowitz]

Hi Han,
Thanks for the quick reply.
The object that I was imaging was towards the edge of the field after the
flip, so it was only about 1degree off--that was probably not the problem.
I am flipping 5 minutes past the meridian, (if I remember correctly), so
maybe that's too close, I'll increase that to maybe 15 or 20 minutes and
we'll see what happens.
Thanks again!
Alan

On Fri, Feb 12, 2021 at 12:43 PM han.k han59@users.sourceforge.net wrote:

Hello Alan,

For solving it doesn't matter if the image is turned around or flipped. so
the meridian flip doesn't influence solving.

I can only guess what wrong at your setup:

1) To large offset after the flip. Could be a few degrees off but with 20
or 30 degree search range you fine.

2) My HEQ5 mount can't sync across the meridian. So solving works but
mount syncing doesn't work till after maybe 5 or 10 minutes till it
actually passed the meridian. so you should never flip exactly at the
meridian. Better 30 or 40 minutes after. I assume you can set that in Nina
(I use CCDCiel)

So check 1) search range of ASTAP as set in Nina and 2) check log for sync
problems or better set meridian flip delayed.

Clear skies, Han

Cannot Plate solve after meridian flip
https://sourceforge.net/p/astap-program/discussion/general/thread/3ee0f255d4/?limit=25#0905

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