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True field of view problem

  1. Jun 29, 2011 #1
    a problem from an olympiad

    "A student tries to measure field of view (FOV) of the eyepiece of his/her
    telescope, using rotation of the Earth. To do this job, the observer points the telescope
    towards Vega (alpha Lyr., RA: 18.5h , Dec: +39° ), turns off its "clock drive" and measures
    trace out time, t=5.3 minutes, that Vega crosses the full diameter of the FOV. What is the
    FOV of this telescope in arc-minutes?"


    may i apply the formula
    TFOV( IN ARC MINUTES)=DRIFT TIME IN SECONDS X COS ( DECLINATION) X 0.250684462

    I got it to be 61.9 arc minutes...is it ok?
     
  2. jcsd
  3. Jun 29, 2011 #2

    Filip Larsen

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    Gold Member

    Looks OK to me.
     
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