Open PHD Guiding – Official Website for PHD2

PHD2 is telescope guiding software that simplifies the process of tracking a guide star, letting you concentrate on other aspects of deep-sky imaging or spectroscopy.


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  • Easy-to-use, “push here dummy” guiding for beginners
  • Sophisticated guiding and analysis tools for experienced users
  • Extensive support for commonly-used equipment
  • Easy upgrade/co-installation with PHD1, including many new features
  • Available for Windows, Mac, and Linux
  • Extensive online help and responsive product support

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Getting started

PHD2 comes with a built-in help file, which is an excellent way to get started with PHD2.
You can access the help file from the Help menu in PHD2, or you can view or download the manual here: HTML PDF.

For questions about using the application, general troublehooting, bug reports, feature requests, and questions about PHD2 development, please post on the Open PHD Guiding Google group.

Please read How to ask for help with PHD2 for tips on how to ask for help with a guiding problem or to report an issue with PHD2.

Latest News

PHD2_Broker package available

Bruce has contributed a new PHD2_Broker package that lets you use PHD2 with the latest CCD Autopilot automation package (v 5.09.8 or later). You can manage your imaging sessions with CCD Autopilot while letting PHD2 handle guiding and dithering in a coordinated way. Details are provided in the help document that’s part of the Broker package. Download: PHD2_Broker download


PHD2 v2.6.1 Released

Head to Downloads for the installation files and release details.


Tutorial: Analyzing PHD2 Guiding Results

A tutorial on how to interpret your Guide Log and improve your guiding performance, by Bruce Waddington. Highly recommended!  Download PDF


Tutorial: Off-axis guiding on comets with PHD2

A tutorial on using PHD2’s Comet Tracking tool for off-axis guiding on comets, by Lars Karlsson.


PHD2 Dither App

Bruce Waddington has contributed a new PHD2 dithering application. This handy utility can be used to dither PHD2 from applications like MaxIm that do not have built-in support for PHD dithering. Download: PHD_Dither 1a


Getting the Most Out of PHD2 Guiding (Video)

Recently Andy Galasso sat down with The Astroimaging Channel to discuss PHD2 via Google Hangouts. You can watch the session here :


PHD2 Log Viewer

Andy Galasso has written this PHD2 Log File viewer for quickly visualizing your guiding performance and spotting problems in your PHD2 Guide Log.

Details here : http://adgsoftware.com/phd2utils/

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Tutorial: Drift Alignment with PHD2

The drift align tool in PHD2 can be used to quickly obtain a precise polar alignment of your equatorial mount. The process takes a little bit of practice, but after doing it a few times, you should be able to obtain an accurate polar alignment in minutes.

Click here to download the tutorial as a PDF

or click here to view online. 

The tutorial was written by Andy and converted to PDF by Doug Duncan.


Translators Needed…

We are looking for help translating PHD2. If this is something you could help with, please post on the open-phd-guiding google group or send me an email. We have a wiki page describing how to translate PHD2.


More News...

News & Resources

June 12, 2016 - PHD2_Broker package available

January 6, 2016 - PHD2 v2.6.1 Released

December 29, 2015 - Tutorial: Analyzing PHD2 Guiding Results

December 20, 2015 - Tutorial: Off-axis guiding on comets with PHD2

June 26, 2015 - PHD2 Dither App