Lecture 8

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School

University of Virginia *

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Course

1210

Subject

Astronomy

Date

Oct 30, 2023

Type

docx

Pages

1

Uploaded by ProfessorLightningPuppy25

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Announcements Hohdaso Modern Telescopes Remote Observing via Skynet Capture images of four unique objects using 24-inch reflecting telescope Images will be captured robotically and you only need to submit your image requests using the Skynet telescope system You will catalog your images, research their characteristics and astronomical significance and submit your lab writeup as a PDF to Collab Potential Issues Underexposed images Oversaturated images Clouds or other artifacts ruining images In most of these cases, new images should be requested When in doubt - email the prof and/or compare to google images of same object Transmission Through Earth’s Atmosphere Only radio and visible light pass easily through Earth’s atmosphere We need telescopes in space to observe other forms Radio Telescopes NRAO Green Bank Telescope, West Virginia (100x110m) Why Are Radio Telescopes So Large? Angular resolution Angular Resolution = 2.5 x 10^5(wavelength/D) Frequency of observations: 10 MHz - 100 GHz Wavelength of observations: 30 m - 0.003 m Infrared and Ultraviolet Telescopes Infrared and ultraviolet light telescopes operate like visible light telescopes but need to be above the atmosphere to see all wavelengths SOFIA and Spitzer X-Ray Telescopes Focusing of x-rays requires special mirrors Mirrors are arranged to focus x-ray photons through grazing bounces off the surface
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