The term LD stands for Lunar Distance, which is a unit of measurement used in astronomy to express the distance between the Earth and the Moon. One LD is approximately 384,400 kilometers (or about 238,855 miles), the average distance from the Earth to the Moon.

When discussing asteroid distances in terms of LD, it indicates how far the asteroid is from Earth relative to the Moon's distance. For example:

0.5 LD means the asteroid is half the distance from the Earth to the Moon (about 192,200 kilometers).
1 LD means the asteroid is at the same average distance as the Moon.
10 LD means the asteroid is ten times farther away than the Moon's average distance.
Why is LD used for asteroids?
Using LD is a convenient way to quickly understand the proximity of asteroids to Earth, especially for Near-Earth Objects (NEOs). It provides a clear, relatable frame of reference since the Moon is a familiar benchmark.

For instance:

An asteroid passing at 0.1 LD (about 38,440 kilometers) is considered a very close approach.
An asteroid at 5 LD (1,922,000 kilometers) is farther but still monitored, depending on its size and trajectory.

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