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Astronomy 105

Exercise 3: Telescopes and Field of View

What is the size of your telescope? and What does this number measure? eight inches in diameter, it measures the diameter.
Is your telescope a refractor or a reflector? We use a Reflector telescope
What is another word for magnification? Magnifying power
Appendix D has the instructions for operating what? The Telescopes
What design is our reflector telescope? Schmidt-Cassegrain
What type of mount does the refractor telescope have? Alt/Az
What kind of drive does the refractor telescope possess? Clock Drive
Which way does the drive move the telescope? North, South, East, West
What is the Magnification formula? MAG= Focal length of telescope/ Focal length of eye piece
What is the significance of 2000mm? 2000mm is the focal length of our telescope.
How do you change the magnification of the telescope? Basically, exchange the eye piece for another eye piece
What does the finder scope do? The finder scope has a much smaller magnification than the main telescope and the finder scope can see more of the sky. Locates objects more quickly.
What is the magnification of the finder scope? 9 Times or 9x
Can the magnification of the finder scope be changed? No because it is fixed in place. We will not be changing the finder scope in class.
Only a ________ portion of a distant ___________ scene can be observed at one time without _________ the telescope. limited,continuous, moving
The region observable with full illumination is what? Field of View
What is the rotation rate of the earth? 15 Degrees
The rate of _________ of a star across the__________only depends on the star's ________, not on the magnifying power. drift, field of view, declination
If an object on the celestial equator moves 15 degrees in 1 hour, how many degrees will it move in 1 minute? .25 degrees
How many arc minutes will an object move on the celestial equator in one minute of time if an object on the celestial equator moves 15 degrees in 1 hour? 15 per minute
How many arc seconds will an object move on the celestial equator in one minute if an object on the celestial equator moves 15 degrees in 1 hour? 900 per second
How many arc seconds will an object move on the celestial equator in one second of time if an object on the celestial equator moves 15 degrees in 1 hour? 15 per second
What is the declination of Altair? 8 degrees, 52 arc minutes, 6 arc seconds
What is the right ascension of Altair? 19hours, 50 arc minutes, 47 arc seconds
What is the magnification with a 40mm eyepiece? 50 times
What is the focal length of a 16 inch telescope? 4880 milimeters
What is the longitude of Las Vegas? 115.137 degrees
What is the latitude of Las Vegas? 36.1095 degrees
How do you turn off the telescope drive? menu,tracking,mode,off
How do you turn the telescope on? menu,tracking,mode,alt-az
What is the formula to calculate the field of view? FV= T(min) x 15' x cos(DEC)
where _____ is the field of view, ________ is the time in minutes to cross the field, ______ is 15 arc minutes and ________ is the cosine of the declination of the star. FV, T(min), 15', cos (DEC)
The Field of View of a telescope using 40 millimeter eyepiece is _________. 44 per minute
You will have to ________ the telescope when you change eyepieces; the ___________ also changes but not the rate of ____________. refocus, magnification, drift
What is the magnification of 12 millimeter eyepiece? 166 Times
What is the relationship between the magnification and the size of the field of view? the bigger the field of view, the smaller the magnification, the larger the focal length
If you know FV, How do you find T(min)? T(min) = FV/ 15' x cos(DEC)
Field of View stands for what abbreviation? FV
the angular size of the full moon is 30 arc minutes. If you want to look at the entire moon with one of our 8 inch telescopes, which eyepiece(s) could you use? 40 millimeter
Which has a larger field of view, your telescope with the 40 millimeter eyepiece or your finder scope? Explain...Why Finder scope; because 40mm (eyepiece) has 50 times the magnification; and the finder scope has 9 times the magnification; making the finder scope have less magnification or bigger field of view
Which star, Betelguese or Mizar, will drift out of your field of view faster if you turn off your telescope's drive? explain why.. Betelguese because it has a lower declination than Mizar
What causes a highly magnified image to go in and out of focus, even when the focus knob is not touched? What do we do to diminish the effect of atmospheric distortion? Atmospheric Distortion; To diminish the effect of atmosphere, large telescopes are built on tall mountains or put in space....
You find a bright star w/ your star pointer; what do you do next BEFORE you look through the eyepiece of the 8 inch telescope? Center the star pointer through Star.
What focal length eyepiece should you be using with the 8 inch telescope? Why...? 40mm because 40mm is the largest eyepiece in terms of field of view.
the finder scope is used for _______objects. Fainter
Created by: 1143643238