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Re: Meridian Flip

Rainer
 

Hallo ¸é±ð²Ô¨¦,

Thanks for your answer and French no :-)

Well from your answer I guess I know now from where my problem comes and will have to investigate further ...

I guess Daniel does not read this Yahoo group ??

I have made the experience that slewing from 2 different parts eg. if I elaborate an alignment model from GCC or I elaborate it from my preferred planetarium programm, I have found out that I have discrepancies in pointing accuacy and so I elaborate my alignment model from Sky Map Pro which I then use for making the GoTo's for my imaging sessions but when I want to add the Meridian Flip error with an additional align and therefore I use the Meridian Flip from GCC and now I think from there comes the problem.

I make all GoTo OBjects commands from Sky Map Pro and use the additional align command of GCC (NOT Handcontrol emulation in GCC).

After having the first alignment model then I do a GoTo and object using Sky Map Pro, do a centering and additional in GCC, then on the same object I command a Meridian Flip from GCC ...

... and then the problem arises when I center the object with GCC (NOT Handcontrol emulation in GCC) and want to make an additional on the flipped object ...

I think now that if I make a GoTo and object within GCC, center, do a Meridian Flip and center and aditional align it could be I do not have the error ...

Will try it tonight to see what happens.

So what I wanted to say is that maybe Sky Map uses other sort of command as GCC does and so the confusion arises :-)

Again thanks for explaining the commands which made me come to this conclusion

That is what ahppens when one uses 2 possibilities to do a GoTo to an object thinking that they both interact in the same manner with the Gemini.

I have GCC connected directly to the Gemini via serial cable into the RS 232 port and my Planetarium program interacts via a Thomas Hilton adapter into the Handcontroller port (female DB 15 port)

Gr¨¹sse Rainer

--- In Gemini-II@..., Rene Goerlich <Rene@...> wrote:

Hi Rainer,

Well then I must be stupid ... Next time I will do a screen shot of
the error GCC is giving me ...

? Have you made after centering the object an " Additional Align "
command ?

Of course the mount goes to the object chosen for the meridian Flip
but when I do not repeat a GoTo to the object by chosing it again and
then centering and then doing an additional align the roor comes up ...

? Clear now ?

I think my english is not understood ...
For sure you are not stupid and I know that you could ask these
questions perfectly in German and Spanish and surely in French too
within a second.

I think the problem is that you have to differentiate between the kinds
of meridian flips possible. Gemini supports two GoTo Move commands: :MS#
(the usual one from the LX200 command set) and the additional :MM#
command. If a MS is received, the GoTo is done and a flip is avoided, if
possible. With a :MM, a flip is done whenever possible to get to the
target.

Gemini monitors the flips and uses two different set of data for
modelling the pointing. The FR and FD parameters are calculated only
ofter doing at least one flip and aligning at the object there. Of
course this also shows that a meridian flip is an integral part of GoTo
and modelling and that the object is remembered.

You did not elaborate how you commanded the flip. If you used the HC
emulation QuickMenu or if GCC sent the :Mf# command (please ask Daniel
for details or check GCC's communication log) the difference to the
flips described above is that this is a new, completely separate
operation. Gemini can't be sure that you want to slew to the latest
object selected, you may have been moving to another object since the
last GoTo was done. This kind of meridian flip is therefore based on
the _current coordinates_. These are used instead of the last object,
modelled and the GoTo is done there.

So you can use a kind of GoTo that commands the flip already at GoTo
time, this saves the necessity for an additional flip and keeps the
object active. With Gemini2, you can check a box for each target
individually if you wish a flip, on the HC or at the Objects web page.

¸é±ð²Ô¨¦
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