Building the Mighty Keck Observatory – Credit: JPL

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In 1985, construction began on what was to become, and still remain, the biggest optical/infrared telescopes on Earth. Since first science in 1993 for Keck I and 1996 for Keck II, the two telescopes are the most scientifically productive telescopes on Earth, publishing more papers per telescope than any of its peers. 

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We are setting up MOSFIRE on Keck 1 for CIT observers, NIRC2-LGS on Keck 2 for UH observers. Sun set 06:37:00pm rise 06:32:00am
.@LindaLy79 Excellent question! Here is the best way to know: mkwc.ifa.hawaii.edu. It's dedicated just to Mauna Kea weather
CIT observers will work with MOSFIRE tonight. And UCI observers will work with DEIMOS. Sun set 06:36:00pm rise 06:33:00am
Observers from CIT will use MOSFIRE on Keck 1, while on Keck 2, UCI observers will use DEIMOS. Sun set 06:36:00pm rise 06:34:00am
On Keck 1, we have NASA observers using MOSFIRE. On Keck 2, we have CIT observers using DEIMOS. Sun set 06:35:00pm rise 06:34:00am