Download PHD2

If you are already using PHD1, note that PHD2 installs separately from PHD1 so you can have both applications installed at once. Installing PHD2 will not affect your PHD1 installation or settings.

We also provide development snapshot builds containing the latest bug fixes and enhancements. These builds may not be as well tested as the general releases, but we would welcome your help testing them out.

Upgrading from an earlier version of PHD2? Just download and run the installer. There is no need to uninstall the older version first. If you do uninstall the older version, you will remove all your profiles and settings.

Note for Gemini/Gemini2 ASCOM users: PHD2 requires the latest Gemini ASCOM Driver, Version 1.0.56.0 or newer.

Looking for a Linux package? Patrick Chevalley has PHD2 Ubuntu packages hosted on Launchpad. If you are using another Linux distro, you can build PHD2 from source: Building PHD2 on Linux.

v2.6.4

25 September 2017

New Predictive PEC Guide algorithm for RA
INDI support added for Windows and Mac
Updated native camera support for QHY, ZWO, SX, and Altair cameras
Improved detection of low-SNR stars by more accurate background calculation
PHD2 now checks for PHD2 updates
AO: better stability when large bumps are required
Various UI improvements, such as allowing arbitrary camera exposure durations
New option for avoiding hot pixels: minimum star HFD threshold
New option for star saturation detection: max ADU threshold
New image logging options based on trigger events like star lost or large offset
Comet tracking improvements
Server API: addition of new API methods
Diagnostic improvements including log file enhancements and more info in fits headers for saved images
Updated translations including a new Portuguese (Brazilian) translation
Help file updates

Download PHD2

v2.6.4

Older Builds