COVID-19 vaccine/positive test reporting required for on-campus classes. Masks strongly recommended and may be required in some offices and classrooms. See details here

Night Sky with Stars


Comet C/2022 E3

We have received many inquiries from the public about viewing comet C/2022 E3 (which has received the nickname "the Green Comet" in some media coverage).  It is fading rapidly after its closest pass by Earth on the morning of February 1. 

While the comet will be above the horizon during the Friday night viewings at Foothill Observatory through February 24, it is fading fast and may not be visible through the end of the month.

We ask that people entering the observatory wear masks (with masks available in case you forget yours).

Comet C/2022 E3 (ZTF), as seen on the morning of January 18, 2023






Foothill College Observatory

Our Foothill College Observatory offers weekly public programs that allow the public to view the wonders of the universe.  COVID-19 precautions are required for all visitors: full-vaccination, face mask, and outdoor queuing.

Public viewing the solar eclipse 

The observatory houses a 16-inch computer-controlled Schmidt-Cassegrain reflector and a hydrogen-alpha solar telescope.

Programming is possible through our community partnership with the Peninsula Astronomical Society (PAS),


PAS Programs at the Observatory

Programs are free of charge to visitors of all ages. The observatory is closed when it is cloudy.  

Program Schedule


Friday Evening Public Viewing: 9 – 11 p.m.
Every clear Friday. The choice of targets for any evening's viewing depends on the season and what objects are currently in the sky.

Saturday Solar Viewing: 10 a.m. – Noon
Every clear Saturday. See spectacular views of two different layers of the sun through white-light and hydrogen-alpha 0.6 Angstrom filters.

Special Public Viewings of Astronomical Events
Scheduled viewing programs. These viewings are scheduled during events of particular astronomical interest, such as eclipses, bright comets, supernovae, etc.

Skies May be Cloudy or Sunny

How can you tell if the sky above the observatory will be cloudy or clear when you plan to attend a viewing? Consult the Foothill Observatory Clear Sky Chart.

Foothill Observatory Clear Sky Chart

How to Read the Chart

  • Click to see larger view of the chart
  • This will take you to the chart legend page where you can learn how to interpret the chart and view full maps of the forecasted weather conditions.
  • Or, go to the PAS webcam site to find out if the observatory is open and what the weather is like.

Observatory Location

Travel Highway 280 to the El Monte Road exit. The observatory is located adjacent to Parking Lot 4 and the Krause Center for Innovation (Bldg. 4000) on the campus of Foothill College in Los Altos Hills, CA. (see map)

Parking at Foothill College is free Winter quarter, 2023.

For more information about the observatory and its programs, call the observatory hot-line at (650) 949-7334.

David Marasco

We're Here to Help!

David Marasco, Dept. Chair


Office Room 4405