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Telescopes - Tools of the Trade Keck telescope in Mauna Kea, Hawaii. Light Pollution. Large lens = more light = brighter image. Collecting Power α (proportional to) Area of the lens (or mirror).

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Telescopes - Tools of the Trade Keck telescope in Mauna Kea, Hawaii


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    Presentation Transcript
    1. Telescopes - Tools of the Trade Keck telescope in Mauna Kea, Hawaii

    2. Light Pollution

    3. Large lens = more light = brighter image Collecting Power α (proportional to) Area of the lens (or mirror)

    4. The Collecting Power of a lens or mirror is proportional to the Area of the lens or mirror. Since Area is proportional to the Diameter2or Radius2we can write Collecting Power α Radius2 (Diameter2) CP α r2 If the size of the mirror or lens is doubled, the collecting power increases by a factor of 4, since CP α (2r)2 α 4r2 Collecting Power

    5. How a lens focuses light

    6. World’s largest refracting telescope – The Yerkes 1-m telescope – University of Chicago

    7. How a curved mirror focuses light

    8. Some focus arrangements for reflectors.

    9. World’s Largest Optical Telescope One of the twin Keck telescopes – 36 mirrors cover an area 10 meters in diameter – Mauna Kea, Hawaii

    10. One of the two Gemini telescopes. One of this telescope pair is on Mauna Kea, Hawaii; the other one is in Chile. The mirror of each telescope is about 8 meters in diameter. The yellow lines show the light path through the telescope.

    11. Diffraction of water and light Diffraction limits the ability to observe fine details. angular resolution (arc seconds) = 0.02 * wavelength (nm)/telescope diameter (cm)

    12. α – angular separation of objects in arc seconds λ – observed wavelength of light in nm D – diameter of telescope lens or mirror α = 0.02λ/D For D = 50 cm and λ = 500 nm (visible light): α = 0.02 * 500/50 = 0.2 arc seconds So, observing in visible light with the given telescope allows us to resolve objects that are separated by 0.2 arc seconds or more. For D = 50 cm and λ = 50 nm (ultra-violet light): α = 0.02 * 50/50 = 0.02 arc seconds So, observing in ultra-violet light with the given telescope allows us to resolve objects that are separated by 0.02 arc seconds or more. Resolution Example

    13. Astronomical Interferometer

    14. Telescope Versus Interferometer Can observe 2 stars!

    15. Photograph of a radio telescope

    16. The Hubble and other observatories

    17. Twinkling of Stars

    18. Effects of refraction

    19. Jupiter Cat’s eye nebula Ring of gas around Supernova 1987 A Hourglass Nebula Images from the Hubble Disk of hot gas in core of the galaxy NGC 4261; a black hole may lie in the disk’s center

    20. The Crab Nebula