Dawn Spacecraft's Potential Third Target, which asteroids does dawn have fuel left to reach?

For those who don't know NASA's Dawn mission team has made an official proposal for an extended mission where the Dawn probe would visit a third asteroid. NASA hasn't stated yet which asteroid this third target is, but I assume we can narrow the list down significantly by looking at what asteroids Dawn could potentially reach. Out of its original budget of 425 kilograms of Xenon propellant for its ion engine, 275 kg was allocated to reaching Vesta and 110 kg for reaching Ceres, leaving some 40 kg of Xenon unallocated. More or less Xenon may be available, depending on how efficient the engine preformed and how much was expended due to unexpected problems (gimble, ect). I doubt DAWN would have enough propellant left to reach Hygeia, but there are other large asteroids in the vicinity of Ceres's orbit, most notably 93 Minerva. Would DAWN have enough Xenon left to reach Minerva? What other asteroids could potentially be a third target for DAWN?

Submitted April 29, 2016 at 02:30PM by Darrkett http://ift.tt/249Zy5L