How many millimicron in 1 astronomical unit?
The answer is 1.49597870691E+20.
We assume you are converting between millimicron and astronomical unit.
You can view more details on each measurement unit: millimicron or
astronomical unit
The SI base unit for length is the metre.
1 metre is equal to 1000000000 millimicron, or 6.6845871226706E-12 astronomical unit.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimicrons and astronomical units.
Type in your own numbers in the form to convert the units!

The SI prefix "milli" represents a factor of
10^{-3}, or in exponential notation, 1E-3.

So 1 millimicron = 10^{-3} microns.

The definition of a micron is as follows:

a metric unit of length equal to one millionth of a meter

››Definition: Astronomical unit

The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length. It is approximately equal to the mean distance between the Earth and Sun. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles).

The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".

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