Introduction to Astronomy

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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 Bright stars Only about half visible in the Northern Hemisphere Bright stars About 25-30 Stars

How can you learn the sky? Astronomy Clubs www.hvaastronomy.com Books Star charts Planispheres Software

Observing Tools - 1 Eyes What if you wear glasses? 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 But you want more! 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 16-32 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

Planets

Nebula

Comets

Free Software Virtual Moon Planetarium WinStars http://www.astrosurf.com/avl/UK_index.html Planetarium WinStars http://site.voila.fr/winstars/english/index2.html Cartes du Ciel (Sky Charts) http://www.stargazing.net/astropc/index.html

Advanced Observing Cameras Variable Stars Meteors Asteroids Supernova Spectroscopy

Meteor Showers

Solar (Our Sun) Spectrum

Questions? Milky Way Galaxy Some Close Galaxies of the Local Group Mass: 1012 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, M32 2.3 million lt. yrs. M33 2.4 million lt. yrs. Most Distant Object Readily Visible in an Amateur Telescope 3C275 2 - 3 billion lt. yrs. (quasar) (typically requires 10-in. or larger telescope)