Telescopes. Galileo 1609 The Moon as a World Jupiter has Moons.
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Transcript of Telescopes. Galileo 1609 The Moon as a World Jupiter has Moons.
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Telescopes
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Galileo 1609
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The Moon as a World
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Jupiter has Moons
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Refracting telescopes
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Isaac Newton’s reflecting telescope
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Reflecting telescope
Objective mirrors instead of lenses
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Three Powers
• Magnifying
• Resolving
• Light Gathering
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Magnifying Power
• Ability to make objects appear larger in angular size
• One can change the magnifying power of a telescope by changing the eyepiece used with it
• Mag Power = focal length of objective divided by the focal length of the eyepiece
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Resolving Power
• Ability to see fine detail
• Depends on the diameter of the objective lens or mirror
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Light Gathering Power
• The ability to make faint objects look brighter
• Depends on the area of the objective lens or mirror
• Thus a telescope with an objective lens 2 inches in diameter has 4 times the light gathering power of a telescope with a lens 1 inch in diameter
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Herschel & Lord Rosse
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19th century: epoch of the large refractors
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Refracting telescopes
Vienna
Lick
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YerkesObservatory
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20th century Large Reflectors Come of Age
Mount Wilson
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Palomar (5-m)
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4 meter Reflectingtelescope
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Objective Mirror
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Dome of 4 meterKitt Peak
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Keck Telescopes
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Rooftop telescopes
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MSU Campus Observatory
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SOAR Telescope
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SOAR Telescope -- Cerro Pachon
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Astronomical “seeing”
• Blurring effect of looking through air
• Causes stars to twinkle
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Bad seeing onthis side
Good seeingon this side
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Electromagnetic Spectrum
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Radio TelescopesArecibo
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Very Large Array
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Very Large Array
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Observing from space
• No clouds
• Perfect seeing
• Can see wavelengths of light blocked by the earth’s atmosphere
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Hubble Space Telescope
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