The "Synchronize" function is especially important after a "Warm Restart," because it 
must be executed in order to enable the other submenus of "Align Telescope." 
5.3.1.5  Polar Al. Assist 
The "Polar Al. Assist" menu item does not appear after a "Cold Start" until you have 
executed   Synchronize.    It is used to roughly polar align your mount by slewing back 
and forth between 2 stars and adjusting the mount' s elevation and azimuth at each star.  A 
complete description of how to use this function can be found in Chapter 3, section 
3.4.2.3 of this manual. 
5.3.1.6  Polar Axis Corr. 
Similarly, the "Polar Axis Corr." menu item does not appear until a pointing model is 
established by performing at least one "Additional Align."  This function (polar axis 
correction) allows you to polar align your mount with fairly high accuracy by taking 
advantage of the pointing model that Gemini is building.  A detailed description of how 
to use this function can be found in Chapter 3, section 3.4.2.3 of this manual. 
5.3.2  Object Database 
  
Messier 
  
NGC 
  
IC 
  
Sh2 
  
Solar System 
  
Bright Stars 
  
SAO 
  
WDS 
  
GPN 
  
LDN 
  
LBN 
  
User Defined* 
5.3.2.1  Database Use 
Gemini 
s "Object Database" contains 11 predefined catalogs and 1 user defined catalog.  
Objects from these catalogs are accessed by executing "Object Database
" 
and then either scrolling to the desired object from the selected catalog, or "typing in" 
(scrolling each digit to) the object 
s catalog number.  When the object is then selected by 
pressing the RA+ button, Gemini confirms the object 
s identifier (name) or catalog 
designation, and displays the hour angle of the object in minutes, and its elevation in 
degrees.  
There is an important difference between the catalogs that enumerate their objects using a 
catalog number (such as Messier or NGC) and those that identify their objects by 
coordinates (such as GPN and WDS).  In the case of the former, simply entering the 
catalog number will select the object.  In the case of the latter, after you enter a number of 
Gemini Users Manual 
4  
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