for doing differential photometry, where one must slew back and forth between the star 

being measured, and several comparison and check stars. 

5.3.7  Identify 

M/NGC/IC/Sh2 Cat 

Object Types 

Magnitudes 

Object Types 

Arbitrary Obj 

All Magnitudes 

Magnitudes 

Stellar Objects 

Magnitude <15m0 

Messier Objects 

NonStellar Obj. 

Magnitude <14m0

Object Types 

Planetaries/SNR 

Magnitude <13m0 

Magnitudes 

Galaxies 

Magnitude <12m0 

NGC Objects 

Clusters 

Magnitude <11m0

Object Types 

Nebulae 

Magnitude <10m0 

Magnitudes 

IC Objects 

Object Types 

Magnitudes 

Sharpless 2 Obj.

Object Types 

Magnitudes 

This menu item identifies up to ten celestial objects that lie within a range of about 10 

degrees from where the telescope is currently pointing.  Those objects nearest the central 

axis are listed first, and your designating the object's catalog, type, and maximum 

magnitude refines the selection. 

You can scroll through the list of identified objects with the DEC buttons.  As each object 

is displayed, it becomes the "selected object," with coordinates and data available in the 

information buffer.  You now have two choices:  (1) The RA+ button will immediately 

GoTo the selected object; (2) the RA  button will display the information buffer and then 

the object, ready for you to perform a GoTo. 

5.3.8  Object Search 

FOV 2 degrees 

FOV 1.5 degrees 

FOV 1 degree 

FOV 50 arcmin 

FOV 40 arcmin 

FOV 30 arcmin 

FOV 20 arcmin 

FOV 10 arcmin 

FOV 5 arcmin 

Wobble Object

Gemini Users Manual 

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