The current version of Perseus is 1.13.4, released on June 19, 2018. If you need to update your version, download and launch patch1_13_4b5019.exe. This patch requires Perseus version 1.5.

Perseus is capable of controlling many electronically-controlled telescopes through the ASCOM drivers. The ASCOM Initiative is dedicated to the creation of a standard for astronomical software, and allows everyone to use the ASCOM platform. This platform contains several drivers for various telescope models. If you want to use an updated ASCOM driver you need to download the ASCOM platform, available on the site

If you want to see the list of modifications related to any patch of Perseus, click here. You'll see a text file with the most recent modifications in the beginning and the older ones in the end. For every patch you'll see the new commands introduced, corrected bugs and notes.

If you find imperfections or errors in the software or in the documentation, if you want to provide some hints, please write an e-mail to

Should you need them, here are provided the previous patches.

Patch version 1.13.352435086 byte
Patch version 1.1341535971 byte
Patch version 1.9.14432040 byte
Patch version 1.84483121 byte
Patch version 1.73467339 byte
Patch version 1.6.13221548 byte
Patch version 1.5.11430696 byte