MMT Observatory
mmtobservatory.bsky.social
MMT Observatory
@mmtobservatory.bsky.social
The MMT Observatory is a 6.5-meter telescope at the summit of Mt. Hopkins, Arizona. The MMT is operated by U. of Arizona and Smithsonian Observatory under a permit from the US Forest Service. Any questions about what we do, just ask! https://www.mmto.org/
Not sure you’d want anything quite that fancy - a plain cotton mop will do
May 21, 2025 at 11:21 AM
For the purchase price, you’d think we would have!! Might’ve been lost in the last 20+ years.

We have a strict “no scrubbing/dragging” policy since the aluminum is exposed and easily scratched, so cotton mops are the best choice.
May 9, 2025 at 7:44 PM
A video was also posted to Reddit showing the contact wash: www.reddit.com/r/telescopes...
From the telescopes community on Reddit: The best way to wash your Primary
Explore this post and more from the telescopes community
www.reddit.com
May 9, 2025 at 12:24 PM
Unfortunately public tours of the MMT are currently unavailable. It’s something we are considering for the future though! The visitor & science center at the base of Mt Hopkins is open most Fridays.
January 17, 2025 at 8:10 PM
During the day the mirror is covered and the chamber is closed. But the chamber is open with the mirror uncovered every night that it is safe to do so.
January 11, 2025 at 11:33 AM
Absolutely not a ridiculous question! We gently dab it with very soft mops while spraying it with water and soap. After it’s clean, we use dryers to ensure we remove all the water without leaving streaks. We’ll make a future post with photos to explain further.
January 11, 2025 at 11:16 AM
November 25, 2024 at 10:52 PM
We are a 6.5-meter telescope in Tucson, AZ
November 25, 2024 at 9:11 PM
Yes
November 25, 2024 at 9:10 PM