Actual Step

Star Alignment using the iEQ45 GoTo Function 

updated: 2026-08-19

Purpose

Align the mount to the Earth axis

Previous Step

Polar Alignment

Required HW

iEQ45 Pro, optional: ASIAIR Pro

Required SW

none

Next Step

Improving the Track Accuracy with PEC

Prerequisites: 

For the GoTo function to work properly it must first "learn" where the scope is currently pointing to, otherwise the position will be declared as Unknown.

The required alignment can be done in three different ways:

  • 1-Star Alignment        - usually sufficient, subsequent slews to other objects will often require manual readjustment.
  • 2-Star Alignment        - improved alignment, subsequent slews to other objects may require slight manual corrections
  • 3-Star Alignment        - very accurate alignment, subsequent slews to other objects may require only minor manual corrections

In most cases, a one-star alignment is sufficient! This is especially true if the mount has been properly balanced beforehand and a good polar alignment has been performed.

To readjust the alignment after slewing to a new target and making a manual correction, sync the new telescope coordinates with the mount. On the iEQ45 handset, open the MENU and select "Sync to Target."


1-Star Alignment 

  • Select a bright star near your intended target
  • Center the selected star in the finder, guider, and finally the main telescope.
  • Correctly align the viewfinder and guider scope with the main telescope.
  • Confirm alignment with OK on the handheld
  • Keep the scope pointed at the bright star for manual focus. 
  • Whenever you move to another target:
    • Re-align by manually centering the new target in the main telescope and then press MENU => "Sync to Target" to adjust the alignment.


See also Daytime Polar Alignment for rough alignment during the day.

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