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Russian 6-m

Russian 6-m. Nasmyth focus platforms Problems: 17-ton mirror has thermal time constant of a few days; location based on politics. Note alt-az mount. Enormous telescopes of the Future. TMT = Ten Meter Telescope (US) OWL = Overwhelmingly Large telescope, 100m. The rest of the spectrum.

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Russian 6-m

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  1. Russian 6-m • Nasmyth focus platforms • Problems: 17-ton mirror has thermal time constant of a few days; location based on politics. • Note alt-az mount

  2. Enormous telescopes of the Future • TMT = Ten Meter Telescope (US) • OWL = Overwhelmingly Large telescope, 100m

  3. The rest of the spectrum • Space-based observatories needed • Radio requires special telescopes

  4. IRAS = InfraRed Astronomical Satellite – early NASA

  5. IUE = International Ultraviolet Explorer—another…

  6. Russian 6-m • Nasmyth focus platforms • Problems: 17-ton mirror has thermal time constant of a few days; location based on politics. • Note alt-az mount

  7. NASA’s Great Observatories

  8. HST = Hubble Space Telescope

  9. Compton Gamma Ray Observatory (GRO) • Mission now over

  10. Chandra X-Ray Satellite

  11. SIRTF = Space Infra-Red Telescope Facility • launched a year ago • Renamed the Spitzer Space Telescope

  12. James Webb Next Generation Space Telescope • > 20-ft diameter • Named after 2nd NASA administrator; built by TRW • L2 Lagrange point for Earth-Sun system (thus 106 times closer to us than sun – mass ratio…), or 940,000 miles from us. (Sun-stationary)

  13. Karl Jansky’s Rotating Antenna (Bell Labs, 1931) Saw a sidereal period (~23h56m) signal

  14. Typical Radio Astronomy Telescope Why so large? ….

  15. Resolution of telescopes • Angular resolution depends on telescope diameter (D) and signal wavelength (λ): Rayleigh criterion: Θmin ~ λ / D

  16. Some numbers … For optical wavelengths, Θ in arc-seconds, and D in inches it works out to Θmin ~ 4.5 / D Example: for your 8-inch telescopes, Θmin ~ 4.5 / 8 = 0.56 arc-sec (note signs…)

  17. Schematic Today: a computer

  18. Green Bank, WV

  19. aricebo

  20. Interferometry

  21. VLA = Very Large Array (NM)

  22. VLBA = Very Long Baseline Array

  23. PARI = Pisgah Astronomical Research Institute

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