Under the Stars with Don

Attend Don's class, How to Use Your Telescope Saturday, March 8 at the Placer Nature Center. See the Events page for more information.


Download a free copy of Don's book, A Decade of Comets.
(24.5 MB Word document)

Download Don's comet hunting spreadsheet.
(32k Excel document)

Photo of Don at his telescope

Welcome to TheCometHunter.com

A website devoted to the discoveries of world-renowned comet hunter, Don Machholz. Find out how Don found each of his comets, view a dizzying array of cometary photographs, and find info on upcoming astro events with Don himself.

Read Don's First-hand Accounts of His Comet Discoveries!

With eleven comets under his belt (so far), Don has discovered more comets than nearly anyone else on the planet. Take a look behind the scenes as Don recounts his moments of discovery on the Comet Discoveries page and share in the thrill of the hunt!