Mosstack is short of Mikko's Open Source Stacker for astronomical images, my project of creating an open alternative to programs such as DeepSkyStacker or AstroSurf Iris. This page will include a manual, other instructions and probably some kind of comparison of different stacking software.


  • Command line interface. Everything can be controlled via command line so you can automate the process with scripts
  • Graphical user interface with PyQt4
  • Basic calibrating and stacking procedure
    • Calibrating (bias, flat and dark)
    • Debayering
    • Registering and aligning
    • Stacking
  • Partial multithreading (works in some parts of process)

Download and install

Source and some distribution packages in BitBucket.
PPA for Ubuntu: pyastrostack

More about installing

Links - My blog contains announcements and plans regarding Mosstack (or pyAstroStack by its old name) 


  • Mosstack 0.7 RC1 0.7 development snapshot released 4th Oct 2015. It's mostly ready. Some features of new CLI are not implemented and program outputs a lot of debug messages. Release was ...
    Posted Oct 11, 2015, 4:09 AM by Mikko Laine
  • Mosstack 0.6 released Summary of changes:Added new stacking methods: Maximum, MinimumAdded Kappa for Sigma stackers in GUI and CLIImageMagick affine transformations disabled as non-working. Code still exists.Changing reference ...
    Posted Dec 9, 2014, 1:07 PM by Mikko Laine
  • Mosstack 0.5.2 released Changes since 0.5.0:- Frame information box below the frame list- Possibility to use ready master frame in command line interface
    Posted Sep 8, 2014, 6:52 AM by Mikko Laine
  • Web page for Mosstack opened You're reading this so you've already found it. Great!This page will have information and instructions about the program
    Posted Aug 24, 2014, 11:45 AM by Mikko Laine
  • Mosstack 0.5 released Get your copy from
    Posted Aug 24, 2014, 11:42 AM by Mikko Laine
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Subpages (1): Why?