Transcript Astronomy 101

Astronomy 101
Telescopes
Telescopes
Refractor
Newtonian Compound
Reflector
Refractor telescope
Newtonian Telescope
Cassegrain telescope
Eyepieces
Best beginner telescope
Pair of Binoculars
 Tripod
 Binocular adaptor
Cheap, reusable, and
great for a beginner.
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Image orientation
Binoculars 4 elements
Correct orientation
 Newtonian telescope
3 elements,
Backwards
 Refractor telescope 2
elements, UpsideDown
Diagonals can be used
to correct this.
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Finder scopes
How to use a finder scope
Magnifying finder scope
 Use the “two eye” method – Keep both
eyes open, the object rises in one and falls
in the other.
Non Magnifying finder scope (Telrad)
 Put the object in the middle circle
 Look in a low power eyepiece.
Next talk
Computing Magnification.
 Field of view
 Stellar magnitudes
 Star colors
 Types of objects to look for
 Messier catalog
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Comet ISON
Look for this comet in Sept of 2013.
 Currently 6.6 AU from the Sun
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Should turn non next year
30% chance of a fantastic comet
 60% chance of a dud…
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Path of comet ISON