astronomical unit | 1 AU | 2 AU | 3 AU | 4 AU | 5 AU | 6 AU | 7 AU | 8 AU | 9 AU | 10 AU | 11 AU | 12 AU | 13 AU | 14 AU | 15 AU | 16 AU | 17 AU | 18 AU | 19 AU | 20 AU | 21 AU | 22 AU | 23 AU | 24 AU | 25 AU | 26 AU | 27 AU | 28 AU | 29 AU | 30 AU | 31 AU | 32 AU | 33 AU | 34 AU | 35 AU | 36 AU | 37 AU | 38 AU | 39 AU | 40 AU | 41 AU | 42 AU | 43 AU | 44 AU | 45 AU | 46 AU | 47 AU | 48 AU | 49 AU | 50 AU | 51 AU | 52 AU | 53 AU | 54 AU | 55 AU | 56 AU | 57 AU | 58 AU | 59 AU | 60 AU | 61 AU | 62 AU | 63 AU | 64 AU | 65 AU | 66 AU | 67 AU | 68 AU | 69 AU | 70 AU | 71 AU | 72 AU | 73 AU | 74 AU | 75 AU | 76 AU | 77 AU | 78 AU | 79 AU | 80 AU | 81 AU | 82 AU | 83 AU | 84 AU | 85 AU | 86 AU | 87 AU | 88 AU | 89 AU | 90 AU | 91 AU | 92 AU | 93 AU | 94 AU | 95 AU | 96 AU | 97 AU | 98 AU | 99 AU | 100 AU |
micrometer | 1.495978707 × 1017 μm | 2.991957414 × 1017 μm | 4.487936121 × 1017 μm | 5.983914828 × 1017 μm | 7.479893535 × 1017 μm | 8.975872242 × 1017 μm | 1.0471850949 × 1018 μm | 1.1967829656 × 1018 μm | 1.3463808363 × 1018 μm | 1.495978707 × 1018 μm | 1.6455765777 × 1018 μm | 1.7951744484 × 1018 μm | 1.9447723191 × 1018 μm | 2.0943701898 × 1018 μm | 2.2439680605 × 1018 μm | 2.3935659312 × 1018 μm | 2.5431638019 × 1018 μm | 2.6927616726 × 1018 μm | 2.8423595433 × 1018 μm | 2.991957414 × 1018 μm | 3.1415552847 × 1018 μm | 3.2911531554 × 1018 μm | 3.4407510261 × 1018 μm | 3.5903488968 × 1018 μm | 3.7399467675 × 1018 μm | 3.8895446382 × 1018 μm | 4.0391425089 × 1018 μm | 4.1887403796 × 1018 μm | 4.3383382503 × 1018 μm | 4.487936121 × 1018 μm | 4.6375339917 × 1018 μm | 4.7871318624 × 1018 μm | 4.9367297331 × 1018 μm | 5.0863276038 × 1018 μm | 5.2359254745 × 1018 μm | 5.3855233452 × 1018 μm | 5.5351212159 × 1018 μm | 5.6847190866 × 1018 μm | 5.8343169573 × 1018 μm | 5.983914828 × 1018 μm | 6.1335126987 × 1018 μm | 6.2831105694 × 1018 μm | 6.4327084401 × 1018 μm | 6.5823063108 × 1018 μm | 6.7319041815 × 1018 μm | 6.8815020522 × 1018 μm | 7.0310999229 × 1018 μm | 7.1806977936 × 1018 μm | 7.3302956643 × 1018 μm | 7.479893535 × 1018 μm | 7.6294914057 × 1018 μm | 7.7790892764 × 1018 μm | 7.9286871471 × 1018 μm | 8.0782850178 × 1018 μm | 8.2278828885 × 1018 μm | 8.3774807592 × 1018 μm | 8.5270786299 × 1018 μm | 8.6766765006 × 1018 μm | 8.8262743713 × 1018 μm | 8.975872242 × 1018 μm | 9.1254701127 × 1018 μm | 9.2750679834 × 1018 μm | 9.4246658541 × 1018 μm | 9.5742637248 × 1018 μm | 9.7238615955 × 1018 μm | 9.8734594662 × 1018 μm | 1.00230573369 × 1019 μm | 1.01726552076 × 1019 μm | 1.03222530783 × 1019 μm | 1.0471850949 × 1019 μm | 1.06214488197 × 1019 μm | 1.07710466904 × 1019 μm | 1.09206445611 × 1019 μm | 1.10702424318 × 1019 μm | 1.12198403025 × 1019 μm | 1.13694381732 × 1019 μm | 1.15190360439 × 1019 μm | 1.16686339146 × 1019 μm | 1.18182317853 × 1019 μm | 1.1967829656 × 1019 μm | 1.21174275267 × 1019 μm | 1.22670253974 × 1019 μm | 1.24166232681 × 1019 μm | 1.25662211388 × 1019 μm | 1.27158190095 × 1019 μm | 1.28654168802 × 1019 μm | 1.30150147509 × 1019 μm | 1.31646126216 × 1019 μm | 1.33142104923 × 1019 μm | 1.3463808363 × 1019 μm | 1.36134062337 × 1019 μm | 1.37630041044 × 1019 μm | 1.39126019751 × 1019 μm | 1.40621998458 × 1019 μm | 1.42117977165 × 1019 μm | 1.43613955872 × 1019 μm | 1.45109934579 × 1019 μm | 1.46605913286 × 1019 μm | 1.48101891993 × 1019 μm | 1.495978707 × 1019 μm |
The astronomical unit (symbol: au or ua) is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 149 597 870 700 metres (about 150 million kilometres, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
astronomical unit | AU | ≡ 149 597 870 700 m ≈ Distance from Earth to Sun | ≡ 149 597 870 700 m | Science - Astronomy (Length) |
astronomical units | micrometers | astronomical units | micrometers |
---|---|---|---|
1 | ≡ 1.495978707E+17 | 4 | ≡ 5.983914828E+17 |
1.5 | ≡ 2.2439680605E+17 | 4.5 | ≡ 6.7319041815E+17 |
2 | ≡ 2.991957414E+17 | 5 | ≡ 7.479893535E+17 |
2.5 | ≡ 3.7399467675E+17 | 5.5 | ≡ 8.2278828885E+17 |
3 | ≡ 4.487936121E+17 | 6 | ≡ 8.975872242E+17 |
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
micrometer | μm | ≡ 1×10-6 m | ≡ 1×10-6 m | Metric system SI |
micrometers | astronomical units | micrometers | astronomical units |
---|---|---|---|
1 | ≡ 6.6845871222684E-18 | 4 | ≡ 2.6738348489074E-17 |
1.5 | ≡ 1.0026880683403E-17 | 4.5 | ≡ 3.0080642050208E-17 |
2 | ≡ 1.3369174244537E-17 | 5 | ≡ 3.3422935611342E-17 |
2.5 | ≡ 1.6711467805671E-17 | 5.5 | ≡ 3.6765229172476E-17 |
3 | ≡ 2.0053761366805E-17 | 6 | ≡ 4.0107522733611E-17 |
astronomical units | micrometers |
---|---|
1 | ≡ 1.495978707 × 1017 |
6.6845871222684 × 10-18 | ≡ 1 |
You can find the conversion in other languages in the following:
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |