ASTR-1010 Planetary Astronomy Day - 18. Announcements Smartworks Chapters 4: Due Monday, March 1. Smartworks Chapter 5 is also posted Exam 2 will cover.

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Presentation transcript:

ASTR-1010 Planetary Astronomy Day - 18

Announcements Smartworks Chapters 4: Due Monday, March 1. Smartworks Chapter 5 is also posted Exam 2 will cover chapters 3, 4, & 5 -Target Wednesday, March 3

ClassAction Stuff Splash page questions

Telescopes & Instruments

Telescopes Telescopes have three functions: 1.Gather light LGP ∝ Area = πR 2 2.Resolve objects Θ = 2.06 X 10 5 ( λ/D) 3.Magnify EXTENDED objects

The light gathering power is proportional to the area

Properties of light: Refraction The Speed of Light is less in glass than in vacuum

Refraction through a plane of glass only shifts the light, a lens with curved surfaces focuses the light

The refracting telescope uses two lenses

Refractors suffer from Chromatic Aberration

Chromatic Aberration distorts colors Rainbows appear around bright white objects

ClassAction Stuff Simple Telescope Snell’s Law Splash page questions

Correcting for Chromatic aberration can be expensive

Large refractors can be very long and bulky. The largest has a 40” diameter

The Yerkes 40” moves the floor to view at low angles

Cheaper Way Mirrors

Reflection is the bouncing of light off a surface

A concave mirror focuses light

There are several types of reflecting telescopes

Spherical mirrors suffer from Spherical Aberration

Spherical aberration can be eliminated by a parabolic shape or a corrector plate

The Largest Optical Telescopes Keck I and II

The 10 meter Keck Mirror

The Hobby-Eberly Telescope

Coming “soon” The 30m Telescope

The resolution of a telescope depends on its size and the wavelength of the light

The atmosphere limits the resolving power of a ground- based telescope

Differences in the temperature and density of small portions of Earth’s atmosphere cause passing starlight to quickly change direction, making stars appear to twinkle.

Earth’s atmosphere hinders astronomical research Image of stars taken with a telescope on the Earth’s surface Same picture taken with Hubble Space Telescope high above Earth’s blurring atmosphere