lecture06 - Astronomy Picture of the Day Ionized gas in the...

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Astronomy Picture of the Day Ionized gas in the Orion Nebula
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UCI Observatory Visitor Night Visitor night will be this Saturday, Oct. 9, 8-10 pm Observatory web site with directions and information: http://www.physics.uci.edu/~observat/visnite_information.html
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Observatory Locations Criteria for a good observatory site: Far from cities and light pollution darker skies Lots of clear, cloudless nights Smooth air±ow over the mountain better seeing High elevation less water vapor overhead
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Observatory Locations Some of the best sites for optical and infrared telescopes: Hawaii : Big Island (Mauna Kea) and Maui (Haleakala) Northern Chile (Lots of mountains, very dry) Canary Islands : La Palma, Tenerife Arizona (Kitt Peak, Mt. Graham, Mt. Hopkins, others) Baja California : Mt. San Pedro Martir The South Pole Sites in California (Mt. Wilson, Mt. Hamilton, Mt. Palomar) are historically important but not great observatory sites by modern standards
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Telescopes: Historical Overview The frst real astronomical telescope was built by Galileo Galilei in 1609 Discoveries included the moons oF Jupiter, and the phases oF Venus
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Newton’s Refector Newton realized that a refecting telescope would not suFFer From chromatic aberration Built the ±rst refector (1672)
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The great refractors Lick Observatory 36” Refractor 1888 (University of California) Mt. Hamilton, CA Yerkes Observatory 40” Refractor 1897 (U. of Chicago) Williams Bay, WI
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lecture06 - Astronomy Picture of the Day Ionized gas in the...

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