astronomy 1010-h planetary astronomy fall_2015 day-21
TRANSCRIPT
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Astronomy 1010-HFall_2015Day-21
Planetary Astronomy
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Course Announcements• How is the sunset/sunrise observing going?
• Dark Sky nights – Wed. 10/7 starting at 7:30pm – at the Observatory.
• Exam-2 will be Friday, Oct. 9; Ch. 3, 4, & 5
• SW-chapter 5 posted: due Fri. Oct. 9
• No lab next week – Fall Break
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Since the eye already has a lens, the eyepiece is needed to bring the light rays back to parallel for the eye to see
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Built in the late 1890’s, it is the last great refracting telescope.
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This applies to camera lenses, your eye, telescopes and anything else that uses a lens to focus light
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The compound lens takes two lenses of different materials and combines them to correct for color distortion
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Since it is meant to be separated we don’t call it an aberration. Instead, it is called dispersion
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Diffraction is much more efficient at separating light into its colors than dispersion
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Look closely enough at stars and they aren’t just points of light but rings, too
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They are large and bulky and difficult
to maneuver
They suffer from chromatic aberration
Even the best glass cuts off the IR and UV wavelengths
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Reflecting telescopes use mirrors. There are primary and secondary mirrors. Focal length is determined by the path the
light takes reflecting off the mirrors.
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Reflection is the bouncing of light off a surface
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Mirrors do not suffer from chromatic aberration and they do not cut off long or short wavelengths
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Telescope mirrors are made so that the focus is a plane instead of a point
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Definitions & Terms -1• Photon: A particle of light.• Spectrum: The flux of an object as a function of
wavelength.