Failure with "center on" feature


#1

Hello all,

I have been new to SGP and have been playing around with its cool tools.

I have been struggling with the “center on” tool after a meridian flip. Before the flip it takes the image, does the flip, then attempts to move back to the original location.

I have it set for within 50 pixels which it usually accomplishes within 2 recenters. However, after the meridian flip it gets “caught” in a location and will continually plate solve, note that it is off, not move, then take a picture, plate solve, not its not in the right place, etc. Until it eventually fails without moving once (I have it set to 6 recenters before failing).

At that point, I hit “center on again” it does another slew and then works perfectly and is usually within 10 pixels.

The rub is that it makes automation a lot harder since I would have to be at the mount for the meridian flip recenter.

Thanks for any help you can provide.


#2

This happen to me on occasion. Usually it is due to the fact that the region I end up in and FOV does not have enough data (good stars) to do the plate solve. Not sure how to solve your problem, I always hang around (or wake up) to make sure SGP gets on target after a flip.It it does not plate solve correctly I simply move the scope to find a good FOV and plate solve and then "center on target."
Ed


#3

Bummer! I was hoping to avoid this so that I could get more sleep.

According to platesolve2 it appears to have successfully plate solved but the “slew to new location” just doesn’t happen.

Thanks again for the help.


#4

you should probably mention what mount you have, what driver, etc., and what centering mode you are using.

for me, with an AP mount and sync-based centering, it works flawlessly every time for me. i never have to babysit the mount, ever. but i know on other mounts you need to use a different centering mode, and it requires some tweaking.

rob


#5

I use the Orion atlas pro with EQMOD. The initial centering of the target is flawless. This only happens after a meridian flip and it tries to re-center. I do nothing other than tell it to “center on” again after it fails and it slews the extra 500 pixels or whatever, and everything is perfect.

I think it must be something wrong with how its telling the mount after a failed plate solve to then move the extra 500 pixels to the new location because it just doesn’t move. It plate solves just fine, the mount doesn’t move.

I wish I had better words to describe what is happening.

Thanks.


#6

well almost certainly the initial centering takes more than one move, right?

i suspected it was EQMOD because i know there has been a lot of talk about how to configure EQMOD with SGP for successful meridian flips… meaning, you’re not the first person to have these kinds of problems. i don’t remember the the thread but it’s worth trying to search this forum for EQMOD and meridian or solve or similar keywords, because there’s a lot of info around regarding this.

SGP has multiple centering modes so some may be more appropriate for EQMOD than others…

rob


#7

The other question is what is your meridian flip position? Flipping on the meridian can cause issues generally. I typically choose 10-15 mins past, so there can be no possible mismatch between where the mount and software believe they are with respect to side of pier.
If it is a case of too few stars, one could increase the exposure for the plate solve, which would likely detect more.


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