# Thread: This Powerful Ion Engine Will Be Flying on NASA’s DART Mission to Try and Redirect an

1. ## This Powerful Ion Engine Will Be Flying on NASA’s DART Mission to Try and Redirect an

Despite humanity’s current struggle against the novel coronavirus, and despite it taking up most of our attention, other threats still exist. The very real threat of a possible asteroid strike on Earth in the future is taking a backseat for now, but it’s still there. Though an asteroid strike seems kind of ephemeral right now, …
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2. I like to think of impulse as force x time, and specific impulse is per unit mass, to get that we multiply those 4190 seconds by g to 41900 N.s/kg
So the mass ejection implied is about 5 mgram/s to get those 0.236 N of thrust.
Alternatively you can say the speed of the ejected mass is 41900 m/s
Did I get that right?

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Originally Posted by profloater
I like to think of impulse as force x time, and specific impulse is per unit mass, to get that we multiply those 4190 seconds by g to 41900 N.s/kg
So the mass ejection implied is about 5 mgram/s to get those 0.236 N of thrust.
Alternatively you can say the speed of the ejected mass is 41900 m/s
Did I get that right?
I don't know much about physics, but would those numbers be sufficient to nudge an asteroid? I imagine it depends on size, how much time is available and so on, how big the angle of an angle of deflection you want etc.

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