| 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.
| 1 astronomical units ≡ 1.495978707E+17 micrometers | 4 astronomical units ≡ 5.983914828E+17 micrometers |
| 1.5 astronomical units ≡ 2.2439680605E+17 micrometers | 4.5 astronomical units ≡ 6.7319041815E+17 micrometers |
| 2 astronomical units ≡ 2.991957414E+17 micrometers | 5 astronomical units ≡ 7.479893535E+17 micrometers |
| 2.5 astronomical units ≡ 3.7399467675E+17 micrometers | 5.5 astronomical units ≡ 8.2278828885E+17 micrometers |
| 3 astronomical units ≡ 4.487936121E+17 micrometers | 6 astronomical units ≡ 8.975872242E+17 micrometers |
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).
| 1 micrometers ≡ 6.6845871222684E-18 astronomical units | 4 micrometers ≡ 2.6738348489074E-17 astronomical units |
| 1.5 micrometers ≡ 1.0026880683403E-17 astronomical units | 4.5 micrometers ≡ 3.0080642050208E-17 astronomical units |
| 2 micrometers ≡ 1.3369174244537E-17 astronomical units | 5 micrometers ≡ 3.3422935611342E-17 astronomical units |
| 2.5 micrometers ≡ 1.6711467805671E-17 astronomical units | 5.5 micrometers ≡ 3.6765229172476E-17 astronomical units |
| 3 micrometers ≡ 2.0053761366805E-17 astronomical units | 6 micrometers ≡ 4.0107522733611E-17 astronomical units |
| 1 astronomical units ≡ 1.495978707 × 1017 micrometers |
| 1 micrometers ≡ 6.6845871222684 × 10-18 astronomical units |