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Absolute Magnitudes for Cepheids

  1. Apr 15, 2007 #1
    Would somebody help me in entering a calculation into my scientific calculator?
    The equation is Mv = - [2.76 log10(P) – 1.0)] – 4.16
    I have the value of P but I'm not sure how to enter this into the calculator. I get a different answer every time.
  2. jcsd
  3. Apr 16, 2007 #2


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    Can you tell us what P is, and some of the answers you are getting? Maybe we can spot what you're doing wrong. What did you get for the 2.76logP part?
  4. Apr 16, 2007 #3
    I'm solving for absolute magnitudes for Cepheids. For my first Cepheid P is 50.0 and my first response was -9.34 but I think I forgot to enter the negative sign at the beginning of the equation.
    thank you.:yuck:
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