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INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

Meridian flip doesn't slew back to the same location

1 month 23 hours ago
giu989
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Meridian flip doesn't slew back to the same location #56834
Hi all,

I'm encountering a problem when I do a meridian flip with my telescope. After the meridian flip the location of the CCD FOV is not centred in the same location. This happens even after alignment when plate solving says the error is < 30".

It seems to me that the point to which plate solving syncs the telescope is not actually the centre of the CCD FOV. Thus when the image is rotated during a meridian flip the two FOVs don't overlap. I have attached 2 pictures showing the problem below. Might anyone know what could be happening?

I am using an explore scientific iEXOS-100 as the mount.

Thank you very much in advance :)
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1 month 20 hours ago 1 month 2 hours ago by alacant.
alacant
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Meridian flip doesn't slew back to the same location #56842
Hi
No log so a guess.

Try checking the:
Reset mount model after meridian flip
option.
HTH

ubuntu 18.04
700d, eq6, t7m

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1 month 17 hours ago
giu989
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Meridian flip doesn't slew back to the same location #56858
Cheers for the suggestion. Will try this when the clouds clear!

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4 weeks 1 day ago
sterne-jaeger
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Meridian flip doesn't slew back to the same location #56949
Have you checked it directly whether the centers of these two images are less than 30“ apart? Looks like it’s more than that.

Therefore it’s surprising for me that align succeeded with a 30“ limit.

But as alcant rightfully stated: without logs we can only guess...

Cheers
Wolfgang

TSA-120 + FSQ-85 + GSO 150/750 | Avalon Linear + M-zero | Moravian G2-8300 + ASI 1600mm pro + ASI 294mc pro | KStars/INDI on Raspberry Pi 4 with Raspbian 10

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3 weeks 1 day ago
DerPit
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Meridian flip doesn't slew back to the same location #57208
My first reflex was to think of the pointing issue when the target location has no associated target. But I had such an observation yesterday night (with latest kstars/indi), and the meridian flip worked well (some 20px offset = 17 arc sec)....

openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+EAF+ASI290 mini

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3 weeks 1 day ago
sterne-jaeger
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Meridian flip doesn't slew back to the same location #57269
I think it‘s more complex. My current suspicion is, that the first real position the slew reaches creates the problem and that the sync either does not happen (bug in kstars) or has no effect (bug in mount driver or below). But as long as I cannot reproduce it, I can’t investigate the problem.

TSA-120 + FSQ-85 + GSO 150/750 | Avalon Linear + M-zero | Moravian G2-8300 + ASI 1600mm pro + ASI 294mc pro | KStars/INDI on Raspberry Pi 4 with Raspbian 10

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3 days 1 hour ago 3 days 1 hour ago by giu989. Reason: format fix
giu989
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Meridian flip doesn't slew back to the same location #58118
Apologies to all for the long delay, today was the first chance I had to test the issue again.

I created an imaging session for the star Vega which also underwent an automatic meridian flip. Whilst it looks quite small, the star is about 150 pixels off where it should be, which with my setup corresponds to about 10'. However the plate solving says the frame is within the 45'' tolerance that I set in the settings, which is clearly not true. I am using the latest version of Kstars and the latest firmware for the mount (iExos-100). I have attached logs from the session.

Thank you very much once again :)
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