Peranso 2.60 is now available. You can download following files:
Copyright © 2020 - All rights reserved
Light Curve and Period Analysis Software
Peranso 2.60 full bundle

This is the full Peranso bundle with all software, online help, tutorial files. User Manual is not included. Size: ~8.0 Mb. Click here to download.
Peranso 2.00 User Manual

User Manual (PDF format). Size: ~2.5 Mb. Click here to download.
Peranso 2.00 User Manual in French language

With special thanks to Bernard Candela for the translation. Click here to download.
If you have troubles downloading, installing or running Peranso, then first read the section below on "Peranso and virus scanners".
Peranso is shareware. You can use the software - in trial version - for a limited period of time (14 days) for free. The trial version is fully functional, but shuts down 10 minutes after startup (during the 14 days trial period).

If you like the trial version, you are invited to register it. This will remove the 10 minutes limitation, and entitles you to receive free minor updates of the software.

Upgrading from Peranso 2.xx to Peranso 2.60

If you are a registered Peranso 2.xx user, and you want to upgrade to Peranso 2.60, then select "Peranso 2.60 full bundle" above. This reinstalls all needed Peranso components. You don't have to apply for a new registration key after upgrading. Your existing key remains operational.
Peranso is extensively checked against virusses before every official release on this website. Some virus scanners nevertheless sometimes report the presence of a virus in Peranso. This may happen during downloading, installing or running the Peranso software.

This is a so called "false positive" detection, also known as a false alarm. It occurs when an antivirus program detects a known virus string in an uninfected file. The file, while not infected with an actual virus, does contain a string of characters that matches a string from an actual virus.

The only solution to this problem is to add the Peranso installation folder (typically: "C:\Program Files (x86)\Peranso") to the exception list of your virus scanner. You will then be able to properly download, install and run Peranso. Check your virus scanner documentation for information on how to create an exception, or contact us.

Virus scanners known to produce "false positives" of Peranso include a/o: Avast, Avira, G-Data, F-Secure, Kaspersky. Contact us if your virus scanner reports a problem with Peranso and is not included in the afore list. provides support to registered Peranso users at
Limited Warranty

Peranso (hereafter, the software) is warranted to perform substantially the tasks described in this document. CBA Belgium Observatory (hereafter, does not warrant that this software is error-free or that it will operate without interruption. The software is warranted to perform substantially the operations described herein using the hardware and software explicitly described in this document. will not be responsible for brand-level peculiarities and changes in computing hardware, operating systems, or computer operating characteristics that take place after the release date of the current version of this software. Reasonable efforts shall be made by to correct software errors reported in writing to does not warrant that all errors will be corrected or that this software will meet your requirements. No information, suggestion, or advice, either written or oral, given by shall extend the scope of the warranty specified here.


All deliverables are provided “as is” without warranty of any kind, express or implied. makes no warranty as to the adequacy of this software or its documentation to produce a desired result. In no event shall or the authors of this software or its documentation be liable to you for any direct, indirect, special or consequential damages, loss of data, or loss of profits that arise from use of this software or its documentation. In no circumstance shall the liability of exceed the purchase price of this software.


Trademarks used in this document include but are not limited to those listed below.
Microsoft, Windows 98, Windows NT, Windows 2000, Windows XP, Windows 7, Windows 8, Windows 10 and Windows Explorer are trademarks of Microsoft Corporation.
Apple, Mac, MacOS and Macintosh are trademarks of Apple


The Peranso software and its documentation are governed by the copyright laws of Belgium and by international treaties. No part of the software and its documentation may be reproduced or transmitted in any form by mechanical, electronic, optical or other means, for any purpose, beyond the personal use of the licensee without the express written permission of