Settings:
Start the ASTAP program. It should be in the menu education or execute /opt/astap/astap Click on the stack menu button Σ (ctrl+A), go to tab alignment. See screenshot below . All settings in the blue rectangle are relevant. There is not much you can change. The "field height image" is forced by the FITS header so changing does not help when using the command line. The only thing you could try is to check mark "slow". And if your final image height is close to 1000 pixel you could set "Tetrahedron tolerance" to 0.007." To save these setting go to the viewer, select File, Settings, Save setting. Or exit viewer via File, Exit (and save settings)
If your having a noisy camera with lot of hot pixels you could experiment with option "Calibrate prior solving" This will apply a dark prior to solving . But up to now this option is very rarely required if ever.
Best way to fix solving problems
Almost all solving problems are due to the wrong field height or a too low image resolution. ASTAP solving is very robust if the correct image and data is provided. You better check the image which was used for solving. Ekos writes the "image to solve" at location /tmp Filename will be something like fitsgd5919.fits. Open this image in the viewer and note the image dimensions in pixels and degrees in the status bar of the viewer. The image height should be 1000 pixels or more. If close to 1000 pixels reduce the binning in Ekos to increase the image height in pixels. Then solve this image using the viewer solve button (or the button in the alignment tab) and see if the image dimensions in degrees change significantly after a successful solve. If so the FOV or sensor size is set wrongly in INDI or INDI has still the Cdelt1,2 bug.
- A solve log is written in the bottom of the stack menu. This could indicate why the solver is having problems to solve.
- You can also have a look in the text file /tmp/solution.ini after solving. This will contain warnings and errors. The same you see in the bottom of the stack menu.
- An other indication is try the button "Test button to show tetrahedrons" or use the CCD inspector from the tools menu viewer. If 30 stars or more are detected solving should be easy.
Finally you can also send me the "image to solve" from /tmp and I will have a look.
Han