Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 au | 1.496e+14 μm | |
| 0.01 au | 1.496e+15 μm | |
| 0.1 au | 1.496e+16 μm | |
| 1 au | 1.496e+17 μm | |
| 5 au | 7.480e+17 μm | |
| 10 au | 1.496e+18 μm | |
| 50 au | 7.480e+18 μm | |
| 100 au | 1.496e+19 μm | |
| 1000 au | 1.496e+20 μm |
Multiply the number of Astronomical Units by 1.496×1017 to get Micrometers. Formula: μm = au × 1.496×1017. Example: 10 au × 1.496×1017 = 1.496×1018 μm. To reverse, divide Micrometers by 1.496×1017 to get Astronomical Units.
| Astronomical Unit (au) | Micrometer (μm) |
|---|---|
| 0.001 au | 1.496×1014 μm |
| 0.01 au | 1.496×1015 μm |
| 0.1 au | 1.496×1016 μm |
| 0.5 au | 7.48×1016 μm |
| 1 au | 1.496×1017 μm |
| 2 au | 2.992×1017 μm |
| 5 au | 7.48×1017 μm |
| 10 au | 1.496×1018 μm |
| 20 au | 2.992×1018 μm |
| 50 au | 7.48×1018 μm |
| 100 au | 1.496×1019 μm |
| 250 au | 3.74×1019 μm |
| 500 au | 7.48×1019 μm |
| 1000 au | 1.496×1020 μm |
| 10000 au | 1.496×1021 μm |
To convert Astronomical Unit to Micrometer, multiply by 1.496×1017. Example: 10 au = 1.496×1018 μm
To convert Micrometer back to Astronomical Unit, divide by 1.496×1017 (multiply by 6.6845×10-18). Use the swap button above.
Start with 100 Astronomical Units = 1.496×1019 μm as your reference point. Scale up or down from there.
Infrared telescopes like Spitzer and JWST observe at wavelengths of 1–300 micrometers. When modelling how dust emission from planetary systems (at AU distances) relates to these wavelengths, AU-to-μm conversion is routine.
Astronomers studying protoplanetary disk structure describe disk radii in AU while analysing grain size distributions in micrometers — dust grain sizes directly influence how planetary systems form at AU-scale distances.
Cosmic dust particles collected from space missions are measured in micrometers under electron microscopes, while their origin locations and collection trajectories are described in AU from the Sun.
Coronagraph instruments blocking the Sun's light have occulter sizes measured in micrometers, while the Sun's corona extends to several AU — both scales appear in the same instrument design documentation.
Researchers studying dust around other stars measure grain sizes in micrometers while describing their spatial distribution around the star in AU — conversion needed when modelling dust emission spectra.
Planetary geologists studying surface features at micrometer scale (grain size, rock texture) correlate findings with planet position in AU from the Sun to understand how solar irradiation drives geological processes.
The Astronomical Unit is a unit of Length measurement (symbol: au). 1 au = 1.496×1017 μm. Used in scientific and practical Length measurement applications.
The Micrometer is a unit of Length measurement (symbol: μm). It is part of an internationally recognised measurement system used alongside the Astronomical Unit.
The astronomical unit has ancient roots — Aristarchus of Samos attempted to measure the Earth-Sun distance around 270 BC, estimating it at 18–20 lunar distances (the true value is about 390). For centuries the AU was estimated using Venus transit observations and trigonometry. Edmond Halley organised the first coordinated international transit-of-Venus expedition in 1716. The modern value was determined by radar ranging to Venus in 1961. The IAU formally defined the AU as exactly 149,597,870,700 metres in 2012 — a fixed constant of physics, not a measured distance.
The micrometre was named in 1879 by the International Committee for Weights and Measures. It became essential in the late 19th century as microscopy and precision engineering demanded a unit between the millimetre and nanometre. The micrometer screw gauge — a precision instrument now bearing the unit's common name — was first described by William Gascoigne in the 1630s, though the modern calliper was developed in the 1840s by Jean-Louis Palmer in France.
Common use: Astronomical Unit to Micrometer conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.