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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 Configuration

4 months 1 week ago 4 months 1 week ago by Megiddo.
Megiddo
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Meridian Flip Configuration #49883
Last night while... ahhh making my normal, non-sleeping walk down the hall :whistle: , I checked my phone to see how close I was to a flip. I noticed a nice timer message counting down on the , which I hadn't noticed before.

Later after another trip (yeah, I'm getting old)... I saw in my yard cam that the rig did do the flip. Plus that message said Status: Inactive

My thoughts are, as long as that count-down message is running, it will flip.

Here's the simulator showing the same thing:
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4 months 1 week ago
RDBeck
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Meridian Flip Configuration #49884
I think you missed my point. I didn't call for a switch in direction. I only commanded a solve and slew. I didn't look at the hour angle until after the slew took the mount to the east side.

Hypertuned NEQ-6Pro, ZWO OAG, ASI 120 min guide camera, SV 80ST, ASI 1600MM Pro, ASI filters and filter wheel, DIY Moonlite-compatible focuser, DIY SQM
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4 months 1 week ago
ChrisRowland
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Meridian Flip Configuration #49889
Any slew that is done when the mount prefers to be on the other side of the pier will do a flip.

All that the pier flip process does is wait until the flip condition is reached, then does a slew to the current coordinates.

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4 months 1 week ago
RDBeck
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Meridian Flip Configuration #49899
It's OK that the flip occurred. The issue is it wouldn't then go to the target (M42). The actual (not the desired) behavior was replicated in KStars. I would think that if the logic says we need to flip that it would then go to the target, not just somewhere close.

The capture and slew and, if I recall correctly, a load and slew did not go to M42 at that point in time. Several minutes later (didn't make note of the actual hour angle), it finally would go to the target.

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4 months 1 week ago
DerPit
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Meridian Flip Configuration #49903
It goes to the same coordinates. Where that is 'on the sky' depends on the quality of your pointing model. So usually it does a solve-and-slew round after flip, if the flip was initiated by EKOS. If it does the flip because it hit the mounts setting limit, this of course doesn't happen, and you are left with the accuracy of your pointing/alignment.

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

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4 months 1 week ago
ChrisRowland
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Meridian Flip Configuration #49905
Normally it's possible to reach any position from one side or the other of the pier and it is possible to track a reasonable distance past the meridian. I'm not sure that all of this applies to your mount and you have a very small range where you can reach an object wth the mount on either side of the meridian. It may even be that there is a zone which can't be reacked at all.

As Der Pit says pointing errors may make your mount point differently when the pier side is changed. Ekos will usually do a solve and sync after a pier flip, at least when it's imaging.

As I said before I don't think there's anything in Ekos to manage hour angle limits, at least at present.

i'm not sure how much we can help though, we can't see your mount and so can't see much of what is needed to help you work out what is going on. A few lines of social media posting doesn't give us much. The result is confusion, misunderstanding and misinformation.

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4 months 1 week ago
RDBeck
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Meridian Flip Configuration #49914
Are you saying my mount model is reflected in KStars? When the mount slewed to Alnitak instead of M42 and plate solving said I was on target, I looked at KStars to see where it thought I was pointing and it indicated Alnitak. I selected M42 in KStars and told EQMod to slew to M42 and it wouldn't move there.

When it wouldn't move to M42, I went to the Flame Nebula in KStars and told EQMod to slew to it. The slew showed properly in KStars, staying on the east side, and plate solving showed I was very close to the target. It took about the usual amount of fine moves to get the mount centered on the target within the tolerance I had given.

I have attached the log from this particular session for additional information. I think the issue starts around line 439150, local time 21:21:30.

File Attachment:

File Name: log_17-19-02.zip
File Size:7,516 KB

Hypertuned NEQ-6Pro, ZWO OAG, ASI 120 min guide camera, SV 80ST, ASI 1600MM Pro, ASI filters and filter wheel, DIY Moonlite-compatible focuser, DIY SQM
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4 months 1 week ago 4 months 1 week ago by DerPit.
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Meridian Flip Configuration #49917
Uh, that sounds weird indeed.
Could it be that you had moved the KStars FOV (not the mount pointing) at some point after having slewed to M42, so that EKOS/the align module thought that was the target?
Also, if you look at the log, the messages from align only start around 21:34, so before there seems to not have been a try to actually do an alignment....
(Edit: and the coordinates refered to there are the ones of M42)

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

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4 months 1 week ago
RDBeck
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Meridian Flip Configuration #49918
Look at line 146277 which shows the mount is on target for M42 at 19:27:54(+) local time. This was on the west side of the pier. I realigned at 19:52 (194825), 20:00 (276814) and 20:18 (311291). At 20:18, the accepted solution is about 2 minutes in declination from M42 (which isn't Alnitak either). I'm still confused....

Hypertuned NEQ-6Pro, ZWO OAG, ASI 120 min guide camera, SV 80ST, ASI 1600MM Pro, ASI filters and filter wheel, DIY Moonlite-compatible focuser, DIY SQM
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4 months 1 week ago
ChrisRowland
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Meridian Flip Configuration #49928
2 arc minutes in declination away is very close after a meridian flip and if you mean 2 minutes of time then it's still only half a degree which is still not bad.

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4 months 1 week ago
RDBeck
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Meridian Flip Configuration #49929
2 arc minutes puts the target outside my FOV.

It's more important to note that this was the plate-solved location that was meant to be M42. I guess I'll just chalk this up as an ongoing mystery.

Hypertuned NEQ-6Pro, ZWO OAG, ASI 120 min guide camera, SV 80ST, ASI 1600MM Pro, ASI filters and filter wheel, DIY Moonlite-compatible focuser, DIY SQM

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3 months 4 days ago
tcm75
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Meridian Flip Configuration #51301
Hey RDBeck!

I had the EXACT SAME SITUATION yesterday!

Since i had flip-problems all of the time i was awake yesterday at flip-time and decided to have a look, what happens.

So everything worked fine, mount flipped, went to the target from the other pierside and made a platesolve afterwards. And then it says "solver succesful" after 1 try , but stays WAY out of the desired location. Funny thing is that when working on "the other side" i can say go there or there, the mount moves but ALWAYS goes to the wrong point in the sky, saying solver succesful!
WTF
I can not understand this behaviour.
Cleared Mount model several times.

Conclusion ATM:

Platesolving works great when west pointing east.
Platesolving goes wild when east pointing west...

System not usable after the flip for me...

Ideas?

Niki
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