Goal: To understand the tools needed to do Amateur Astronomy.

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Presentation transcript:

Goal: To understand the tools needed to do Amateur Astronomy. Objectives: To understand telescopes To understand binoculars To understand Astrophotography – cameo To understand star charts

Telescopes Which of the following is the most important aspect of a telescope 1) magnification 2) diameter of mirror/lens 3) length of the telescope 4) none of the above

Magnification Makes the image bigger The magnification = focal length of mirror focal length of eyepiece So, no telescope has a specific magnification – can always use a smaller eyepiece

A tale of two images

A tale of two images

Another way to magnify Barlow Lens Magnifies telescope

Don’t buy into magnification http://www.walmart.com/ip/Elenco-Mobile-20x-30x-40x-30mm-Astronomical-Telescope-with-Tripod/28420325 If they have to focus on the magnification, it is a terrible telescope – DON’T BUY IT!

Resolution A measure of the smallest detail you can see Depends on the effective diameter of the telescope Resolution (ignoring atmosphere and for optical light) = 151 arc seconds / diameter in mm

Two types of telescopes Refracting, uses a glass lens to bend light Not all color bend equally Chromatic Abrasion ZERO professional telescopes are this type Most good amateurs don’t use this type Telescopes you find of this type are usually cheap and worthless

Reflecting Telescope Designed by Isaac Newton Uses a mirror to reflect light All professional, and most amateur telescopes are reflecting The 4 inch scopes we are using for class are reflecting telescopes

Level of tech on telescopes Dobsonian – no bells an whistles, are pretty cheap 6-8” telescope for $200-$300 Tracking – but not computerized, can move with the sky and allows you to take longer exposure images 6-8” telescope for $1000 Computerized – all the bells and whistles 6-8” telescope for $2000

Binoculars Wide range of quality and price Good to look at large objects like the moon and large clusters/nebulas Very bad for smaller, fainter objects Astronomy binoculars tend to be a bit longer than hunting binoculars (more magnification)

Stats on binoculars A X B is what you will find. The first number represents the magnification, the second if the diameter of the lenses So, a 8X 23 would be a magnification of 8 and a diameter of 23 mm (about 1 inch)

Astrophotography Taking pictures of space Cameo guest speaker, Dr. Fritz Kleinhans

Star Charts http://www.skymaps.com/downloads.html http://www.skymaps.com/skymaps/tesmn1410.pdf http://www.astronomy.com/ http://www.skyandtelescope.com/

Rise and Set times http://aa.usno.navy.mil/data/docs/mrst.php

Conclusion: We have examined telescopes and binoculars We have learned about astrophotography and star charts