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hich required darker skies than what could be found in the los angeles area due to the ever increasing problem of light pollution in 1989 the carnegie institution which ran the observatory handed it over to the non profit mount wilson institute at that time the 2 5 meter telescope was deactivated but it was restarted in 1992 and in 1995 it was outfitted with a visible light adaptive optics system and later in 1997 it hosted the unisis laser guide star adaptive optics system 19 20 as the use of the telescope for scientific work diminished again a decision was made to convert it to use for visual observing because of the high position of the cassegrain focus above the observing floor a system of mirrors and lenses was developed to allow viewing from a position at the bottom of the telescope tube with the conversion completed in 2014 the 2 5 meter telescope began its new life as the world s largest telescope dedicated to public use regularly scheduled observing began with the 2015 observing season 21 the telescope has a resolving power of 0 05 arcsecond interferometry edit further information astronomical interferometer and list of astronomical interferometers at visible and infrared wavelengths astronomical interferometry has a rich history at mount wilson no fewer than seven interferometers have been located here the reason for this is the extremely steady air over mount wilson is well suited to interferometry the use of multiple viewing points to increase resolution enough to allow for the direct measurement of details such as star diameters 20 foot stellar interferometer edit the first of these interferometers was the 20 foot stellar interferometer in 1919 the 100 inch hooker telescope was equipped with a special attachment a 20 foot optical astronomical interferometer developed by albert a michelson and francis g pease it was attached to the end of the 100 inch telescope and used the telescope as a guiding platform to maintain alignment with the stars being studied by december 1920 michelson and pease were able to use the equipment to determine the precise diameter of a star the red giant betelgeuse the first time the angular size of a star had ever been measured in the next year michelson and pease measured the diameters of six more red giants before reaching the resolution limit of the 20 foot beam interferometer 22 50 foot stellar interferometer edit to expand on the work of the 20 foot interferometer pease michelson and george e hale designed a 50 foot interferometer which was installed at mount wilson observatory in 1929 it successfully measured the diameter of betelgeuse but other than beta andromedae could not measure any stars not already measured by the 20 foot interferometer 23 optical interferometry reached the limit of the available technology and it took about thirty years for faster computing electronic detectors and lasers to make larger interferometers possible again infrared spatial interferometer edit main article infrared spatial interferometer the infrared spatial interferometer isi run by an arm of the university of california berkeley is an array of three 1 65 meter telescopes operating in the mid infrared the telescopes are fully mobile and their current site on mount wilson allows for placements as far as 70 meters apart giving the resolution of a telescope of that diameter the signals are converted to radio frequencies through heterodyne circuits and then combined electronically using techniques copied from radio astronomy 24 the longest 70 meter baseline provides a resolution of 0 003 arcsec at a wavelength of 11 micrometers on july 9 2003 isi recorded the first closure phase aperture synthesis measurements in the mid infrared 25 one of six telescopes of the chara array chara array edit main article chara array the center for high angular resolution astronomy chara built and operated by georgia state university is an interferometer formed from six 1 meter telescopes arranged along three axes with a maximum separation of 330 m the light beams travel through vacuum pipes and are delayed and combined optically requiring a building 100 meters long with movable mirrors on carts to keep the light in phase as the earth rotates chara began scientific use in 2002 and routine operations in early 2004 in the infrared the integrated image can resolve down to 0 0005 arcseconds six telescopes are in regular use for scientific observations and as of late 2005 imaging results are routinely acquired the array captured the first image of the surface of a main sequence star other than the sun published in early 2007 26 other telescopes edit caltech infrared telescope in the museum a 61 cm telescope fitted with an infrared detector purchased from a military contractor was used by eric becklin in 1966 to determine the center of the milky way for the first time 27 in 1968 the first large area near ir 2 2 μm survey of the sky was conducted by gerry neugebauer and robert b leighton using a 157 cm reflecting dish they had built in the early 1960s 28 known as the caltech infrared telescope it operated in an unguided drift scanning mode using a lead ii sulfide pbs photomultiplier read out on paper charts 29 the telescope is now on display at the udvar hazy center part of the smithsonian air and space museum 29 events edit the snow solar telescope 1906 letters to the mount wilson observatory are the subject of a permanent exhibition at the museum of jurassic technology in los angeles california a small room is dedicated to a collection of unusual letters and theories received by the observatory circa 1915 1935 these letters were also collected in the book no one may ever have the same knowledge again letters to mt wilson observatory 1915 1935 isbn 0 9647215 0 3 the historic monument came under threat during the august 2009 california wildfires 30 the english poet alfred noyes was present for the first light of the hooker telescope on november 2 1917 noyes used this night as the setting in the opening of watchers of the sky the first volume in his trilogy the torchbearers an epic poem about the history of science according to his account of the night the first object viewed in the telescope was jupiter and noyes himself was the first to see one of the planet s moons through the telescope 31 in september 2020 the observatory was evacuated due to the bobcat fire 32 33 flames approached within 500 feet 150 m of the observatory on september 15 34 35 but the observatory was declared safe on september 19 36 in january 2025 the observatory was evacuated due to the eaton fire which approached mount wilson on january 9 37 sunday afternoon concerts in the dome edit on one sunday each month during the warmer months of the year mt wilson observatory hosts a chamber music or jazz concert in the dome 38 the idea to use the dome as a venue for live music originated in 2017 from a conversation between dan kohne a board member of the mt wilson institute and cécilia tsan an internationally recognized cellist 39 tsan agreed that the acoustics in the dome were extraordinary comparable to such world renowned venues as the palais garnier opéra de paris and the coolidge auditorium at the library of congress 40 kohne and tsan worked together to create the series which has run every concert season except for a break during the covid 19 pandemic given that the observatory is no longer able to do significant research due to light pollution it receives no scientific funding the concerts therefore provide a significant portion of the budget needed to maintain the observatory as an historic landmark along with ticketed events such as public viewing nights 41 in popular culture edit this section does not cite any sources please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed december 2025 learn how and when to remove this message the observatory was the primary setting of nothing behind the door the first episode of the radio series quiet please which originally aired june 8 1947 the observatory was a filming location in a space themed episode of check it out with dr steve brule see also edit list of largest optical reflecting telescopes list of largest optical telescopes historically list of largest optical telescopes in the 20th century list of astronomical interferometers at visible and infrared wavelengths list of observatories mount wilson toll road references edit 1 2 hansen wendy july 6 2008 mount wilson observatory an astronomical gem los angeles times harris newmark sixty years in southern california 1916 search results for ci_6674075 san gabriel valley tribune december 16 2025 retrieved december 17 2025 1 2 mount wilson observatory archived from the original on july 12 2015 retrieved august 11 2015 turner paula c the curea program at mount wilson pdf kenyon college retrieved september 21 2020 pinkerton stephen chen casey history of the 60 foot solar tower university of southern california retrieved september 21 2020 gilman pam 2003 the 150 foot solar tower history university of california los angeles retrieved september 21 2020 mount wilson observatory archived from the original on september 5 2015 retrieved august 11 2015 astronomical observing through the mount wilson 60 inch telescope pdf archived from the original pdf on december 28 2013 purtill corinne october 3 2023 the battle to save mt wilson observatory where we found our place in the universe los angeles times retrieved october 3 2023 chicago tribune archives retrieved 2017 05 16 1963apj 137 1319s page 1319 articles adsabs harvard edu retrieved december 17 2025 serviss garrett p january 27 1907 the greatest telescope in the world monster instrument ordered by carnegie institution will far exceed in power all other watchers of the skies pdf new york times history of mount wilson observatory building the 2 5 meter telescope archived 2015 09 05 at the wayback machine article written by mike simmons in 1984 for the mount wilson observatory association mwoa building the 100 inch telescope mount wilson observatory retrieved april 16 2026 mount wilson observatory 100 inch hooker telescope pdf american society of mechanical engineers retrieved april 16 2026 bonnier corporation july 1935 aluminum coated mirrors boost power of giant telescope popular science bonnier corporation p 17 engineering and science monthly may 1949 pdf mount wilson observatory archived from the original on may 29 2015 retrieved august 11 2015 thompson laird a september 2 2013 laird a thompson professor of astronomy jc t com archived from the original on september 5 2015 retrieved september 21 2020 mount wilson observatory archived from the original on september 5 2015 retrieved august 11 2015 mount wilson observatory archived from the original on july 12 2015 retrieved august 20 2015 vaughan arthur h jr august 1967 interferometer measurement of star diameters astronomical society of the pacific 10 458 57 bibcode 1967aspl 10 57v retrieved september 21 2020 infrared spatial interferometer array system overview university of california at berkeley retrieved august 31 2015 a a chandler k tatebe d d s hale c h townes march 10 2007 the radiative pattern and asymmetry of irc 10216 at 11 μm measured with interferometry and closure phase pdf space sciences laboratory and department of physics university of california berkeley ca u m astronomers capture the first image of surface features on a sun like star university of michigan 2007 05 31 monster of the milky way nova pbs october 31 2006 retrieved september 21 2020 1968 two micron sky survey pdf archived from the original pdf on may 28 2008 retrieved september 21 2020 via pennsylvania state university 1 2 reflecting telescope infrared caltech national air and space museum march 20 2016 retrieved march 19 2018 mozingo joe august 30 2009 station fire likely to hit historic mt wilson observatory fire officials say los angeles times noyes alfred 1922 watchers of the sky new york frederick a stokes staff laist bobcat fire blaze grows to over 38k acres serious threat to mt wilson laist retrieved september 15 2020 bobcat fire grows to nearly 38 300 acres jumping contingency line sierra madre residents urged to prepare to flee ktla september 14 2020 retrieved september 15 2020 bobcat fire threatens multiple fronts from mt wilson to foothill neighborhoods los angeles times september 16 2020 retrieved september 18 2020 smith hayley september 17 2020 evacuations ordered in parts of antelope valley as bobcat fire moves within 1 mile of juniper hills los angeles times retrieved september 18 2020 overbye dennis september 19 2020 mount wilson observatory survives a trial by fire the new york times retrieved september 20 2020 lloyd jonathan january 9 2025 eaton fire flares up near summit of mount wilson nbc los angeles retrieved january 9 2025 braz anna august 21 2023 one of the most magnificent concert venues in l a is the dome of this 100 inch telescope los angeles times archived from the original on march 2 2024 retrieved june 15 2024 adamek pauline august 2021 jazz concerts in the dome mt wilson observatory artsbeatla com archived from the original on december 3 2023 retrieved june 15 2024 kaan gil july 21 2021 interview cellist cécilia tsan on combining her musical artistry with concerts programming broadwayworld com archived from the original on july 27 2021 retrieved june 15 2024 purtill corinne october 3 2023 saving mt wilson observatory inside the long battle to maintain the spot where we found our place in the universe los angeles times archived from the original on june 15 2024 retrieved june 15 2024 external links edit wikimedia commons has media related to mount wilson observatory official website the 100 inch hooker telescope 150 foot solar tower webcam image chara the isi array mount wilson observatory clear sky clock letters to the mwo 1915 1935 hearst magazines january 1931 telescope s five ton eye is restored with silver popular mechanics hearst magazines p 1 image of the sixty inch telescope at the mount wilson observatory 1920 1939 los angeles times photographic archive collection 1429 ucla library special collections charles e young research library university of california los angeles portals california astronomy stars spaceflight outer space solar system education science authority control databases international isni viaf gnd fast national united states norway israel artists museum of modern art other idref yale lux retrieved from https en wikipedia org w index php title mount_wilson_observatory oldid 1367899801 categories astronomical observatories in california educational buildings and structures in los angeles county california san gabriel mountains san gabriel mountains national monument history of pasadena california landmarks in los angeles myron hunt buildings edwin hubble hidden categories articles with short description short description is different from wikidata use mdy dates from...