command and centering the object, you should next select Align Telescope
Additional
Align.
5.3.1.2 Reset Alignment
Occasionally, the observer wants to clear Gemini
s pointing model, and build the model
again. This can occur if a mistake was made in the identity of a star when an "Additional
Align" was performed. To clear Gemini
s pointing model while retaining the original one
star alignment, GoTo a star (using either "Align Telescope
GoTo Bright Star" or using
"GoTo
s field of view, and then execute "Align
Telescope
Reset Alignment."
There is no displayed confirmation that the model has been reset. Instead, Gemini
presents you with the last selected object for alignment. For this reason, before doing a
"Reset Alignment," it is best to slew to the star that you want to be the first in your new
model. If you select Reset Alignment but do not want to reset the pointing model at
this time, escape from the Menu Mode by pressing the MENU button.
5.3.1.3 Additional Align
Use this function to add other alignment objects to Gemini' s pointing model. You should
use either the "Align Telescope
Goto Bright Star" command or the "GoTo
command to point the telescope to a known object, center it, and then execute
Additional Align. After selecting Additional Align, Gemini responds by verifying the
object by name. Now press the RA+ button, and Gemini displays the mount' s offset
from the pole in both elevation (E) and azimuth (A), that were calculated as a result of the
alignment object.
The difference between the position Gemini pointed to when you did the "GoTo"
operation and the one you moved to when you centered the object, gives Gemini the
required data for refining the pointing model. Careful centering (for example, by using a
reticle eyepiece) will improve the accuracy of the calculated model parameters. The
number of these parameters increases with the number of alignments, and they can be
looked at in the Information Buffer by executing the "Show Information" menu item.
5.3.1.4 Synchronize
After any type of startup (Cold Start, Warm Start, Warm Restart), or in the course of an
observation, Gemini may be slightly off in its pointing orientation while retaining its
pointing model. In other words, Gemini' s concept of where it is pointing in RA and Dec
may be slightly off from the actual sky by a constant amount. This can occur anytime the
telescope
s clutches are loosened or certain components of the optical path are moved or
replaced (e.g. the star diagonal is rotated). The phenomenon will readily be noticed
when, after performing several accurate GoTo operations, subsequent GoTo slews leave
the target object unexplainably uncentered in the field of view.
To correct this, center any known star (or other object) using the Hand Controller, and
execute "Align Telescope
Synchronize." Gemini responds by verifying the object by
name. Now press the RA+ button, and Gemini responds by displaying "Synchronized!"
Gemini Users Manual
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