si tacuisses, philosophus mansisses.
Astrophotography by GrandpaJunkrat - ----- Data Processing
Cosmology from my armchair..............................
I do it metric .............................................................. Location:
Sneek
bastion@protonmail.com The Netherlands
Bortle 7 - 9
Under constrution. 09-10-2025
Processing in SIRIL
In all SIRIL processing, Debayer and CFA (Color Filter Array) are disabled. For differential photometry, I treat the lights as if they were black-and-white images.
Processing in ASTAP
Platesolve the batch in ASTAP, This creates a new fits file with the solved data. (overwrites the old files)
Tool/Batch Processing - calibrate - add lim - (both on)
Processing in AstroImageJ
Import image sequence, use "virtual stack"?
Check the files with arrow keys, close the window.
Go to DP.
In the "DP Coordinate Convertor" frame check the observatory settings, UTC time etc...
In the "DP CCD Data Processor" frame enter the correct directorys for the lights, Bias, and Dark frames.
There are two options: Build and Enable. The first time, a master must be created, so Build must be selected the first time.
Since we don't have any masters yet, both options need to be selected.
We use the same Bias and Dark Frames frequently, so only Enable needs to be selected the next time. Flats are recreated each session, so we use the Build and Enable functions for flats each time.
Ignore Image Correction
Open "Fits header" option (Wrench). In the Fits Header Setting make sure that the information in the Fits Header Input Settings are the same as the headers in your images (6 top fields.) In the FITS Header Output Settings the field "BJD (TDB) mid-Obs Keyword" must contain the value "BJD_TDB".
In "DP Coordinate Converter" update DynamicaL Time and ensure that Leap-secs is set to "auto". This is necessary for correct time to BJD_TDB conversion.
In "DP CCD Data Processor" change the Target Coordinate Source to FITS header target RA/DEC (J2000) and the Observatory Location Source the entry to FITS Header latitude and longtitude.
Under "Save Calibrated Images" set the output directory and a suffix for the calibrated files
Click start to process the images.
Close all frames and now import the calibrated files.
(Select stack images with best focus)
