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 "), center it in the telescope 
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 
4  
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