Celestron OMNI XLT 102 User Manual
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INTRODUCTION .......................................................................................................................................................... 4
Warning...................................................................................................................................................... 4
ASSEMBLY .................................................................................................................................................................... 8
Setting up the Tripod .................................................................................................................................. 8
Attaching the Equatorial Mount ................................................................................................................. 9
Attaching the Center Leg Brace ............................................................................................................... 10
Installing the Counterweight Bar.............................................................................................................. 10
Installing the Counterweights................................................................................................................... 11
Attaching the Slow Motion Control Knobs (Cables)................................................................................ 11
Attaching the Telescope Tube to the Mount............................................................................................. 12
Installing the Finderscope......................................................................................................................... 13
Installing the Visual Back......................................................................................................................... 13
Installing the Star Diagonal ...................................................................................................................... 14
Installing the Eyepieces............................................................................................................................ 14
Moving the Telescope Manually .............................................................................................................. 15
Balancing the Mount in R.A..................................................................................................................... 15
Balancing the Mount in DEC ................................................................................................................... 16
Adjusting the Mount................................................................................................................................. 16
Adjusting the Mount in Altitude............................................................................................................... 17
Adjusting the Mount in Azimuth.............................................................................................................. 17
TELESCOPE BASICS ................................................................................................................................................. 18
Image Orientation..................................................................................................................................... 20
Focusing ................................................................................................................................................... 20
Aligning the Finderscope ......................................................................................................................... 21
Calculating Magnification ........................................................................................................................ 21
Determining Field of View....................................................................................................................... 22
General Observing Hints .......................................................................................................................... 22
ASTRONOMY BASICS............................................................................................................................................... 23
The Celestial Coordinate System ............................................................................................................. 23
Motion of the Stars ................................................................................................................................... 24
Latitude Scale ........................................................................................................................................... 25
Pointing at Polaris .................................................................................................................................... 25
Finding the North Celestial Pole .............................................................................................................. 26
Polar Alignment in the Southern Hemisphere .......................................................................................... 27
Pointing at Sigma Octantis ....................................................................................................................... 28
Finding the South Celestial Pole (SCP).................................................................................................... 28
Declination Drift Method of Polar Alignment.......................................................................................... 29
Aligning the R.A. Setting Circle .............................................................................................................. 30
Using the R.A. Vernier Scale ................................................................................................................... 31
CELESTIAL OBSERVING......................................................................................................................................... 32
Observing the Moon ................................................................................................................................. 32
Lunar Observing Hints ............................................................................................................................. 32
Observing the Planets ............................................................................................................................... 32
Observing the Sun .................................................................................................................................... 33
Solar Observing Hints .............................................................................................................................. 33
Observing Deep Sky Objects.................................................................................................................... 33
Seeing Conditions..................................................................................................................................... 33