Introduction to Astronomy. Beginnings Learning the Sky Observing Tools What you will see Advanced observing.

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Presentation transcript:

Introduction to Astronomy

Beginnings Learning the Sky Observing Tools What you will see Advanced observing

Learn the Sky 88 Constellations –Only about half visible in the Northern Hemisphere Bright stars –About Stars

How can you learn the sky? Astronomy Clubs – Books Star charts –Planispheres Software

Observing Tools - 1 Eyes –Young eyes ~0.3”-0.4” telescopes –Older Eyes ~0.25”-0.3” What if you wear glasses?

Observing Tools - 2 Binoculars –What to know about Roof Prisms Porro Prisms Coated/Uncoated BAK4, BAK7 Magnification

Observing Tools - 3 Telescopes –Refracting –Reflecting –Catadioptric

What will you see? Eyes - ~0.25” Telescopes –Stars to about magnitude 6-7 –A few none stellar objects Andromeda Galaxy Planets and the Moon A few star clusters and nebula But you want more!

What will you see - 2 Binoculars - ~2”-4” Telescopes –Same stuff as with naked eyes, but….. –You’ll be able to see objects times more faint! –Galaxys, Globluar clusters, nebula, etc.

What will you see - 3 Telescopes - ~4”-20+” –Same stuff as with eyes and Binoculars, but…. –Now you will be able to see objects up to 100’s of times more faint –Ability to see fine detail (resolution)

Galaxies

Nebula

Comets

Planets

Cameras Variable Stars Meteors Asteroids Supernova Spectroscopy Advanced Observing

Meteor Showers

Solar (Our Sun) Spectrum

Questions? Milky Way Galaxy –Mass: solar masses –Center: Direction: α = 17.8h, δ = -29° (Sagittarius) –Distance: 29,000 lt. yrs. –Diameter: 326,000 lt. yrs. –Velocity: 370 miles/sec relative to 3°K background radiation –toward α = 10h, δ = -20° (southeast Hydra) Some Close Galaxies of the Local Group –Large Magellanic Cloud 163,000 lt. yrs. –Small Magellanic Cloud 196,000 lt. yrs. –Leo I 750,000 lt. yrs. –Leo II 750,000 lt. yrs. –M31, M million lt. yrs. –M million lt. yrs. Most Distant Object Readily Visible in an Amateur Telescope –3C billion lt. yrs. –(quasar) (typically requires 10-in. or larger telescope)

Free Software Virtual Moon Planetarium –WinStars –Cartes du Ciel (Sky Charts)