Equinox Systems GEMINI Manuel d'utilisateur Page 26

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Gemini Users Manual 21
confirm the object to which you are pointing by displaying its name. Press RA+ to
complete this alignment. Repeat the process for the third alignment star on the same side
of the meridian. This will establish a basic pointing model. You may continue to refine
the model on this side of the meridian by repeating the process with several more stars if
desired.
IMPORTANT: When using the “Additional Align” command, you must already be
pointing to the star on which you want to align. The easiest way to do this is to use
the “Align TelescopeGoTo Bright Star” command as described above. The
“Additional Align” command does not move the telescope. Failure to do this will
result in a “Sorry, rejected” message from Gemini.
Next, pick one more alignment star on the side opposite the meridian from the first 3, and
repeat the Additional Align process just described. The reason for doing this is that after
a meridian flip, you'll experience an offset in RA caused by play in the RA gear (Now the
opposite side of the worm and teeth are in contact). Additionally, some parts of the
system (such as the main mirror of an SCT) will have flopped to the other side. Adding
one more alignment after a meridian flip allows Gemini to know how big the play in the
RA gear and the flop are, and take them into account. For best results, choose a star in
the middle of the hemisphere, ensuring that the RA gear is in good contact. Refocusing
also helps to move the mirror into a stable position after the meridian flip.
To summarize:
For each of your other 2 alignment stars:
o Select “Align TelescopeGoTo Bright Star”
o Select an alignment star from the "Bright Stars" catalog
o Mount will slew to that star
o Use Hand Controller buttons to center the star in the eyepiece
o Select “Align TelescopeAdditional Align”
o Display will confirm the object to which you are pointing
o Press RA+ to complete the alignment
o Gemini will display the calculated offset from the pole in arcseconds in
azimuth (A) and elevation (E). For example, it might display “A:+15 E:-
10” to indicate that your mount is 15 arcseconds from the pole in azimuth
and 10 arcseconds from the pole in elevation.
Choose a star on the opposite side of the meridian
Perform the above steps for an Additional Align on that star
You should now be ready for normal operation with your Gemini. You can perform
more Additional Aligns any time during your observing session to further refine the
model. Be sure to read chapter 3 for more information about starting up and aligning
Gemini in its different startup modes, and for more details about Gemini’s internal
modeling capabilities.
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