If you can make the asteroid cross Earth's orbit 430 seconds sooner or later that's an Earth diameter. Two approaches to getting that number... https://www.wo

If you can make the asteroid cross Earth's orbit 430 seconds sooner or later that's an Earth diameter. Two approaches to getting that number... https://www.wolframalpha.com/input?i=diameter+of+earth+%2F+%28length+of+orbit+of+earth+%2F+%28number+of+seconds+in+a+year%29%29 https://www.wolframalpha.com/input?i=diameter+of+earth+%2F+%... https://www.wolframalpha.com/input?i=%28430+seconds+*+earth+orbital+velocity%29+%2F+earth+diameter https://www.wolframalpha.com/input?i=%28430+seconds+*+earth+... Granted, you'd probably like more than a diameter... but we're talking about it getting there a few minutes faster and it would be a miss.