Welcome to the MMT Observatory


Latest News

  • Click here for more MMTO news and highlights
  • Aging a Flock of Stars in the Wild Duck Cluster

    Do star clusters harbor many generations of stars or just one? Scientists have long searched for an answer and, thanks to the MMT and its Hectochelle instrument, found one in the Wild Duck Cluster, where stars spin at different speeds, disguising their common age. The UA news story can be read here.

  • Km 18.5 Road Stabilization Project

    There is currently road work leading to the summit at Km 18.5. During Phase 1, the goal is to keep the road open with minor interruptions. There will be restricted access to cars. There are currently 2 windows per day that allow vehicles to pass through. The first is at 8:45-9:15AM with another at 3:50-4:20PM. Work begins at 6AM and continues to 6PM. Due to these closures, it is our preference that you plan for remote observing. Coming up to the mountain is still possible if you feel you must be there, but please expect the road to be closed at the time you might normally want to come down from the summit. Please also expect that it may not be an easy drive in the construction area. Phase 2 will begin in November and will have major interruptions.

  • Update on Tours

    Due to scheduled road construction leading to the MMTO, no tours are currently scheduled. Tours will resume towards the end of the year. Please check back here for updates!

  • MMT Observing Schedule - August-December

    The observing schedule for August-December can be found here.