Chp 4.2_Astronomical Telescopes and Instruments.pdf - Chp...

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Chp 4.2 Astronomical Telescopes and Instruments
This lesson focuses on the different types of telescopes.Astronomers need different types of telescope becauseeach shows different objects.
Professional telescopes arereflectors with large mirrors(typically 8 meters or more)Astronomers don’t look directly throughthe telescopes, but use computersto control the telescopes and analyzethe images.Optical TelescopesOptical telescopesgather only visible light.
18Telescopes onMauna Kea, HawaiiTelescopes onthe Canary islandsOptical telescopes are built on high mountains(Why?)Gemini observatoryhttps://Optical TelescopesOptical telescopesgather only visible light.
Lightpollution– The illumination of the night sky byartificial outdoor lighting makes it impossible toobservefaintobjects.• TelescopesonEarthmustmovecontinuously(siderealtracking) to compensate for Earth’s rotation and staypointed at stars/celestialobjects.• An ideal location for a ground based telescope – amountain top, dry and thin air,awayfrom city lights.Also, airflow should not be turbulent for goodseeing.Optical Telescopes- Limitations
• Located high inthe remoteAndesMountains ofnorthern Chile.• Consists offourtelescopeshoused in separate domes.Mirror in each telescope is 8.2 min diameter.4 telescopes combined will havediameter of a 100m telescopeOptical Telescopes:The Very Large Telescope (VLT)
Optical Telescopes: The Gran Telescopio CanariasLargest single telescope in theWorld.Located on top of a volcanicpeak in the Canary Islands.Hassegmented mirror which is10.4m in diameter.
22Radio telescopes can observeday and night, and throughcloudy skies.

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Term
Fall
Professor
NoProfessor
Tags
Astronomy, Telescopes, Hubble Space Telescope, Optical Telescopes, radio telescopes

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