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Radius of a photon's circular orbit around a mass

  1. Jun 14, 2013 #1
    What is the radius of a photon's circular orbit around a mass M? My guess would be the Scharzschild radius. Is that true?
     
  2. jcsd
  3. Jun 14, 2013 #2

    WannabeNewton

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  4. Jun 14, 2013 #3

    Bill_K

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    For Kerr, the Wikipedia article only mentions the two (co-rotating and counter-rotating) circular equatorial photon orbits. Does Kerr have closed non-equatorial photon orbits? (If so, they would presumably be noncircular.)
     
  5. Jun 14, 2013 #4

    WannabeNewton

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  6. Jun 14, 2013 #5

    Bill_K

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    Wow, that's very interesting! Thanks
     
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