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Astronomy 105
Exercise 3: Telescopes and Field of View
| Question | Answer |
|---|---|
| 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 |
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