Includes

ImageJ 1.54m1 and Java 25

General

• AIJ hosting, including website, update files, and installation packages, has moved to a github hosted implementation, which is now accessed at astroimagej.com.
• The update process and user experience has changed to accomodate updating of all AIJ files, including the java runtime version, and also provides higher security. The update process now implements a full new install package and may require additional clicks and interaction from the user.
• Windows builds are now signed using a certificate from the SignPath organization.
• Updated Java to version 25.
• AIJ logs are now moved out of the installation folder and into a separate log folder.
  • Windows: %LOCALAPPDATA%\AstroImageJ\Logs\aij.log
  • Mac: ~/Library/Logs/AstroImageJ/aij.log
  • Linux: ~/.local/state/astroiamgej/logs/aij.log

New Features

Periodogram Support

• Greg Srdoc has contributed a new module that provides Box Least Squares (BLS), Transit Least Sqaures (TLC), and Lomb-Scargle (L-S) periodograms from measurements table columns. To use the feature, create a measurements table by running Multi-Aperture. If needed, detrend and/or smooth the lightcurve and save to a new column in the measurements table using the “New Col” icon on the left-hand side of the Y-data panel. Then from Image Stack > Analyze, choose “Periodogram Analysis…”. BLS and TLS are useful for long time-baseline observations such as TESS or Kepler space-based data. L-S periodograms search for sinusoidal components in time-series, so may be useful for analysis of ground or space-based data.

Image Display

• Image Display > Edit > Stack (Stack Sorter) now supports virtual stacks.

Coordinate Converter

• The finder field button now links to the Swarthmore Aladin FOV tool. Various default settings can be changed at CC > Preferences > Edit Aladin Settings.

Multi-plot

• In phase-folding sub-panel, added “Period Alias (P/N)” setting. This setting is used to quickly change the period set in “Period (Days)” to Period/N. This setting is useful for assessing active aliases in TESS data with large observation gaps (e.g. duo transits).

Bug Fixes

General

• On Mac, fixed an error when displaying “About AstroImageJ”.

Multi-Aperture

• Fixed bug in auto threshold min and max brightness values when auto is disabled.
• Fixed bug in auto fixed apertures from multi-image T1 radial profiles option flux cutoff value.
• Fixe bug in lock eccentricity and angle when use previous apertures is selected.
• Fixed bug in elliptical apertures related to apparent magnitude values.
• Fixed bug that caused tot_C_err, rel_flux_err, and rel_flux_SNR to not be calculated when “Use multiple threads for photometry” is enabled.

Image Display

• Fixed a bug with SIMBAD access when using the Harvard mirror site.

Coordinate Converter

• Fixed a bug with SIMBAD access when using the Harvard mirror site.
• Added BARO, BARON, and OAN to built in observatories.
• Moved custom observatories location to same folder that contains AIJ_PREFS.txt file.
  • Windows: C:\Users\USERNAME\.astroimagej
  • Mac: /Users/USERNAME/Library/Preferences/.astroimagej
  • Linux: ~home/.astroimagej
• Fixed a bug with the “Use previous apertures” option.
• Added option to customize observatories withing the Coordinate Converter.