Hi!
No, it is a slew in RA - I'm doing it with the same declination,
just slewing in RA, to test. And right, no crossing the meridian.
But physically, crossing the 90 degree azimuth line, the
counterweight bar crosses to the other side of the mount - hence
shift of side-of-pier, in a very literal sense.
Yes, it impacts my guiding since when the mount reports shift of
side-of-pier, PHD2 swaps direction of RA guiding. But since no
direction of the guidecam or otherwise in the mount has happended,
this means that RA now escalates errors, rather than works against
them - hence escalating run away scope.
In essence, PHD2 interprets shift of side-of-pier as a meridian
flip. But this is not the only case when it occurs nor when the G2
reports it.
It took me quite a while to see this... And I guess this is not
what would be problematic in regular AP, when you find a target,
maybe calibrate, and then track for hours. Then there is a
meridian flip, RA shifts, and back to tracking. It happens here
because I slew from target to target, imaging 20-25 different
targets with just one or two subs of each, but I need guiding
because I do some 5 mins exposures and I get too much drift if no
guiding. I have my complex sequence set up so it goes from lower
altitude to higher, picking stars before they are too low,
basically, and then waiting for some to rise some more (manually
sorted). It means that it will start out on the west side, going
in sort of zig-zag motion from RR Tau to GM Cam, to YY Aur, to U
Gem and so on.
Do you see it now? Or what can I send or describe that makes it
more clear?
Best,
Magnus
Den 2020-04-19 kl. 17:48, skrev Brian
Valente:
Hi Magnus
No, it doesn't really make sense to me.? if i go from NE to SE,
this is just a DEC move, i'm not crossing the meridian. So why
would it report side of pier change? confused abou tthis
i can slew back and forth, but it sounds like your issue is how is
guiding impacted, correct?
So i would assume you need some guiding to take place in this
situation to see how it impacts.
