General Question Setting Orbital Periods

Luke Reichelt

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As I have done with my Star Trek systems, I've decided to majorly update my Babylon 5 systems, to allow for more series-accurate physical parameters and some new scenarios, the latter being part of a larger project between myself and Buck Rogers. For the Narn homeworld (AKA the 82 Eridani system), I am trying to set the planet's orbital period to a specific amount, namely 38.5344Ms, or 446 days. What is the formula I use to calculate the required semi-major axis?
 
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dgatsoulis

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As I have done with my Star Trek systems, I've decided to majorly update my Babylon 5 systems, to allow for more series-accurate physical parameters and some new scenarios, the latter being part of a larger project between myself and Buck Rogers. For the Narn homeworld (AKA the 82 Eridani system), I am trying to set the planet's orbital period to a specific amount, namely 38.5344Ms, or 446 days. What is the formula I use to calculate the required semi-major axis?
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