100″ Telescope Reservations

Viewing through 100-inch Hooker Telescope.
An Experience of a Lifetime


This year we celebrate the centennial of the world's largest telescope from 1917 to 1949. The 100-inch forever altered our understanding of the size and nature of the Universe and launched a revolution in astronomy that continues through today. This world-heritage class instrument, used by many of the greatest astronomers of the Twentieth Century, has only recently been made available for regular public viewing. Imagine looking through the telescope used by Edwin Hubble in the 1920s to measure the expansion of the Universe.


Photo: Norm Vargas.

Your Session Director will arrange your visit


Meeting Time: Chosen or agreed to by the Session Director, typically around Sunset. For safety and other logistic considerations, planning multiple additional arrival time(s) cannot be accommodated.
Parking: We can accommodate up to 10 cars or up to a 30-passenger bus to park at or near the telescope dome. Any greater number of cars or larger size of passenger bus will require special logistics and must be discussed with the Session Director well in advance of the session.
National Forest Adventure Pass: Only needed if the Session Director determines that special logistics parking are required. Go to www.fs.fed.us/r5/angeles if passes are required.
Cancellation: Your session confirmation or cancellation the day of the session may be done only by the Session Director. Weather, telescope/observatory operations and/or external reasons are some factors that may require cancelling the session.
Dome logistics and accommodations Dome lights: Will be turned down to dim red for observing.
No Handicapped Access: The dome was built in 1908 and is not ADA-compliant, offering no access for those who cannot climb stairs and ladders. Visiting is not suggested for those with respiratory or heart problems due to the stairs and the 5700-ft elevation.
Chairs: Mount Wilson Observatory provides chairs.
Refreshments: We provide hot water, hot chocolate, coffee, tea, cups, and stirrers/spoons.
Smoking (including “vapors”) & Alcoholic Beverages are not permitted at Mount Wilson Observatory.
Restroom: Located inside the dome, on the ground level.
Photography: Non-flash photography through the eyepiece during the observing session will be permitted, with the approval of the Telescope Operator and Session Director. Special and advance approval from the Session Director is required for cameras or other devices to be mounted to the telescope. Before the session starts, feel free to take photographs of the telescope and Observatory grounds.

What to bring with you for the observing session


Clothing: Warm layers like sweater, coat, hat, etc. as the dome is not heated and the temperature in the dome can quickly drop. Sturdy closed-toed shoes/boots.
Flashlights: White flashlight when leaving the dome; red flashlight during the observing time.
Refreshments: You may bring your own snacks and non-alcoholic beverages to be consumed on the observing level.
Observing list: While the Telescope Operator has a list of appropriate objects for the 100-inch Telescope, please feel free to bring your own observing list. The Telescope Operator’s decision is final on whether a particular object can be observed at a particular time.
The 2016 fee rates are $2700 per half night and $5000 per full night for a group of up to 18 people. We are able to schedule a half night of observing for the first half of the night only. Logistical problems preclude us from scheduling two different groups for the first and second halves of the night. We also do not provide a service for matching different groups to share the same reservation. Occasional individually-ticketed nights are announced during the season from this website and from our Facebook Page.
Scroll through the calendar to see if the date you want is still available. Please note, however, that all dates displayed as available may not be if someone has asked for the date and it has not yet been finalized and the calendar updated.
There are no services available for the period you selected.
You must select at least two days
2017 June
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100" Telescope Reservation Request

Step 1: Contact Information

Contact Name

Step 2: Details

Important: Please check the calendar of availability first.
Limited to 18 persons total per visiting group
1 adult required per 5 children
Ex: Private Vehicles, 4 or Bus, 1

Step 3: Terms of Agreement

Please read and check-mark each section.
Sending
For telescope users interested in taking photographs, click here for a PDF file with helpful information on how to take the best images at your 100-inch Telescope viewing session.

For current weather conditions on Mt. Wilson, go to Weather Underground.

The 100-inch Telescope, with the interior dome lights turned on. Another night of observing the Universe is about to begin. Photo credit: Elisa Webster.