BI India
Lunar Distance (LD) is the measurement used. It is comparable how far the asteroid will be from the Earth in relation to how far the Moon is from the planet.
An LD of 1 would mean that it will be as close to Earth as the Moon — approximately 384,400 kilometres. An LD of 2 would mean twice as far and an LD of 3 would mean thrice as far. The lower the LD, the closer the asteroid will be to Earth.