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.

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Presentation transcript:

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 Space-based observatories needed Radio requires special telescopes

IRAS = InfraRed Astronomical Satellite – early NASA

IUE = International Ultraviolet Explorer—another…

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

NASA’s Great Observatories

HST = Hubble Space Telescope

Compton Gamma Ray Observatory (GRO) Mission now over

Chandra X-Ray Satellite

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

James Webb Next Generation Space Telescope > 20-ft diameter Named after 2 nd NASA administrator; built by TRW L 2 Lagrange point for Earth-Sun system (thus 10 6 times closer to us than sun – mass ratio…), or 940,000 miles from us. (Sun-stationary)

Karl Jansky’s Rotating Antenna (Bell Labs, 1931) Saw a sidereal period (~23 h 56 m ) signal

Typical Radio Astronomy Telescope Why so large? ….

Resolution of telescopes Angular resolution depends on telescope diameter (D) and signal wavelength (λ): Rayleigh criterion: Θ min ~ λ / D

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

Schematic Today: a computer

Green Bank, WV

aricebo

Interferometry

VLA = Very Large Array (NM)

VLBA = Very Long Baseline Array

PARI = Pisgah Astronomical Research Institute