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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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