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Homework Help: Photometry- zero points of telescopes.

  1. Jan 16, 2008 #1
    1. The problem statement, all variables and given/known data

    I need to calculate the zero point of the telescope and camera i used.

    2. Relevant equations

    3. The attempt at a solution

    I have count rates of various points on the screen in a 19x19 pixel box of a standard star using the two filters V and R. Ive used exposure times of 20 seconds. I have been told that the zero point is the magnitude that corresponds to a raw ccd count rate of 1 count per second. I am fairly lost on how to go about finding the zero point. Can anyone give me a push in the right direction. Thanks
  2. jcsd
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