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Why does a bight object like the sun have negative magnitude?

  1. Dec 6, 2004 #1

    DB

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    Why does a bight object like the sun have negative magnitude?

    TY
     
  2. jcsd
  3. Dec 6, 2004 #2

    Labguy

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    Science Advisor

  4. Dec 6, 2004 #3

    DB

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    thnx, i understand the math now, but how do u think of an object with for example a magnitude of 19? what class of magnitudes would it be in?
     
  5. Dec 6, 2004 #4

    russ_watters

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    I'm not sure what you mean: the object is detected, its brightness measured, and its magnitude is calculated.
     
  6. Dec 7, 2004 #5
    Do you mean spectral classes?

    Also, remember the difference between absolute and apparent magnitude, which describe the object's magnitude from 10 parsecs and from a chosen distance, respectivly.
     
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