ansvr - local plate solver

The ansvr bundle allows Sequence Generator Pro users to run the plate solver on their PC in place of the Web service. This allows SGP users to access the plate solver without an internet connection.

Although ansvr was originally written for SGP, several other applications are now using ansvr as a convenient way to run the plate solving engine on the local Windows PC. If you are running AstroImageJ or another application that can make use of ansvr, please follow the installation instuctions below, but simply stop at the point where the instuctions start talking about configuring SGP. At that point you have a fully functioning ansvr / Local installation and you can proceed to setup your application to use it.

The installer is fully self-contained; there are no prerequisites for installing any other packages.


  1. Download the installer: ansvr-setup-0.20.exe.      [ChangeLog]    [Windows XP Info]
  2. Run the installer
  3. Click Next or choose an alternate install location:
  4. Click Next or choose an alternate Start Menu folder name:
  5. Click Next or choose an alternate port number for ansvr:
  6. Click Install:
  7. Wait for files to extract. The progress bar will look like it is stuck in the middle for a long time. Be patient...
  8. Click Finish. You can leave both boxes checked.
  9. Now you will download the astrometric index files that you need for your setup. Select the files you need and click Start. The files are very large (increasingy so for the narrower FOV indexes) and it can take a very long time to download them.
  10. Progress of the download is in a separate window. Close the window if you need to cancel the download. Next time you run the index file downloader, progress will resume where it left off.
  11. Confirm that ansvr is running by opening the Ansvr Settings item in the start menu
  12. A page like this will open in a web browser window with the ansvr settings. If you see this page, ansvr is running. The setup program put an icon into the Windows Start Menu Startup folder to automatically start ansvr whenever you log in, so ansvr will always be available.
  13. If you want to watch the ansvr log file, Click Watch Ansvr Log in the Start Menu folder to open a window viewing the log file. You can close the window when done. Ansvr will not be affected by closing the window; you can still do blind solves regardless of whether the window is open or not.
  14. Configure SGP to use the local solver. Open the Control Panel:

    Select the Plate Solve tab, and click Blind Settings. Select ANSVR.

    In older versions of SGP ( and earlier) you need to copy and paste the following value into the End Point setting:

  15. Now test a plate solve: open an image in SGP, right-click, Plate Solve, Blind Solve
  16. Solved!

Windows XP Compatibility

The most recent version of ansvr is based on a version of cygwin that is not compatible with Windows XP. You can still use ansvr on Windows XP by running an older version of the installer
  • Install ansvr-setup-0.18.exe, the most recent version that was compatible with XP
  • After the installation is complete, select Check for Ansvr Updates from the Start menu Local Solver folder. This will update the ansvr script only, keeping the cywin installation at the XP-compatible older version.

Getting Help

You can get help on ansvr by posting on the Main Sequence Software forum, or you can contact me directly:
andy DOT galasso AT gmail DOT com

Andy Galasso