From: mennoltvanalten01@gmail.com   
      
   In my school in the last trimester of the 5th year everyone does group   
   projects about a space mission. We have to design a mission to well, we don't   
   know yet, but it will probably be Mars. Last year, the only group there was   
   sent a probe to Europa from    
   Mars, using a Homann transfer to do so. Too bad that the ion engine they used   
   needed 10 years to expend all it's fuel to get ~20km/s. This wouldn't work,   
   because that is longer than the flight time for the Homann trajectory. So I   
   wanted to use other    
   formulae to find out how to get somewhere with low thrust engines. The Atomic   
   Rockets site gives some formulae for brachistone transfers, but I expect they   
   won't hold up well when solar gravity becomes significant. Is this correct? If   
   so, are there    
   formulae for low g transfers, or does it all need to be modelled?   
      
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