ASIAIR based workflow

Target and Mosaic Planing using and ASIAIR

updated: 2022-10-04


Preparing image capturing for mosaic images

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Equipment SetUp

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Processing Mosaic Images

See also

Target  and Mosaic Planning on

Setting the correct Camera Orientation

Preparation and Picture Acquisition

My first experience using 4 panes of mosaic images or NGC7000, each consisting of 10 frames at 300s exposure time and a gain of 120. Planning was done with

click on copy CSV, go to the Plan Mode of ASIAIR and click on the import symbol. This will add 4 plans each with it's own R.A. and DEC coordinates. 

After rotating the camera to 247° as targeted by Telescopius,com the plate solved picture returned by ASIAIR  SkyAtlas looked quite different compared to the the planned orientation in Although both tools now indicate a 247° orientation, the pictures don't match and the camera rotation is not correct. The reason why the orientation differs from the deseired field of view will be explained later.

Plate-solving one captured image returned -52.335 deg (flipped) as result which is 360° - 52.305° = 307° but this value doesn't match the original planned 247,9° at all.

HINT: See also Setting the correct camera orientation in the previous chapter.

The correct camera orientation can be obtained by a simple calculation and depends on the position angle returned by Telescopius,com and the initial camera orientation:

  • Position angle between 0° and 180°
    • if camera orientation is upside up: ASIAIR Rotation = Position Angle
    • or if the initial camera orientation is upside down: ASIAIR Rotation = 360° - Position Angle
  • Position angle between 180° and 360°
    • if camera orientation is upside up: ASIAIR Rotation = 360° - Position Angle
    • or if the initial camera orientation is upside down:ASIAIR Rotation = 360°+ 180° - Position Angle or: 540° - Position Angle
      as in the above case. Planned rotation position =  540° - 247° = 293°

HINT: this means to be careful regarding planning of the correct camera orientation already in Telescopius,com and to avoid camera angles above 180° to make it easier for the next steps!

After manually rotating the camera to a similar visual orientation as in Telescopius,com, the final orientation on the ASIAIR looked like this and read 307.6°:

Instead of manually rotating the camera to this 307° position, it should have been turned to 293° (calculation:540° - 247° = 293°), that would have solved the wrong orientation during the capture phase, so the pictures were 14° off the correct orientation!

The capturing process was then started using this wrong camera orientation. 

This is an improved mosaic plan using a camera orientation of just 73°for the same target:

Please  have a look at the post-processing steps in the chapter Processing Mosaic Images

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