Key points :
You need astrophysicists and aerospace engineers to calculate the
tagging points and the best machine to continuously monitor it and
the best weapons to deflect it. In short , invent a weapon which
could destroy the asteroid or deflect it off the keyhole without a
huge amount of risk to humans down below.
You need mathematicians and astrophysicists to calculate its
current trajectory and possible future trajectory . Should it
impact - estimate the points of impact on its path and the where
the weapon should be launched.
And you can only make a possible error of only 0.05%
Not to mention you need a financial analyst to cost your
project.
All for 50k ....and no your name will not be mentioned as the one
who saved the planet. You just get nothing at all except a
momentous applause and fame which lasts for a certain period of
time while someone else innovates on your idea and then takes all
the credit for a new astrophysics theory. This starts to stinks of
copernicus, kepler and galileo.