Le frequenze usate in questo campo si trovano in questa banda:
λ: 1 mm –100 km; ν: 300 GHz –3 kHz
La scelta delle frequenze Radioastronomiche venne fatta nel 1991 a Buenos Aires durante
il XXI° congresso dell’International Astronomical Union, in modo da preservare le frequenze
di interesse scientifico. Le frequenze vennero normalizzate secondo questa tabella (per osservazioni nel
continuo):
| Sostanza | Frequenza centrale | Banda minima suggerita (1) |
|---|---|---|
| Deuterium (DI) | 327.384 MHz | 327.0 - 327.7 MHz |
| Hydrogen (HI) | 1420.406 MHz | 1370.0 – 1427.0 MHz (2), (3) |
| Hydroxyl radical (OH) | 1612.231 MHz | 1606.8 – 1613.8 MHz (3), (4) |
| Hydroxyl radical (OH) | 1665.402 MHz | 1659.8 – 1667.1 MHz (4) |
| Hydroxyl radical (OH) | 1667.359 MHz | 1661.8 – 1669.0 MHz (4) |
| Hydroxyl radical (OH) | 1720.530 MHz | 1714.8 – 1722.2 MHz (3), (4) |
| Methyladyne (CH | 3263.794 MHz | 3252.9 – 3267.1 MHz (3), (4) |
| Methyladyne (CH) | 3335.481 MHz | 3324.4 – 3338.8 MHz (3), (4) |
| Methyladyne (CH) | 3349.193 MHz | 3338.0 – 3352.5 MHz (3), (4) |
| Formaldehyde (H2CO) | 4829.660 MHz | 4813.6 – 4834.5 MHz (3), (4) |
| Methanol (CH2OH) | 6668.518 MHz | 6661.8 – 6675.2 MHz (3), (6) |
| Ionized Helium Isotope (3HeII) | 8665.650 MHz | 8660.0 – 8670.0 MHz |
| Methanol (CH3OH) | 12.178 GHz | 12.17 – 12.19 GHz (3), (6) |
| Formaldehyde (H2CO) | 14.488 GHz | 14.44 – 14.50 GHz (3), (4) |
| Cyclopropenylidene (C3H2) | 18.343 GHz | 18.28 – 18.36 GHz (3), (4), (6) |
| Water Vapour (H2O) | 22.235 GHz | 22.16 – 22.26 GHz (3), (4) |
| Ammonia (NH3) | 23.694 GHz | 23.61 – 23.71 GHz (4) |
| Ammonia (NH3) | 23.723 GHz | 23.64 – 23.74 GHz (4) |
| Ammonia (NH3) | 23.870 GHz | 23.79 – 23.89 GHz (4) |
| Silicon monoxide (SiO) | 42.821 GHz | 42.77 – 42.86 GHz |
| Silicon monoxide (SiO) | 43.122 GHz | 43.07 – 43.17 GHz |
| Carbon monosulphide (CS) | 48.991 GHz | 48.94 – 49.04 GHz |
| Deuterated formylium (DCO+) | 72.039 GHz | 71.96 – 72.11 GHz (3) |
| Silicon monoxide (SiO) | 86.243 GHz | 86.16 – 86.33 GHz |
| Formylium (H13CO+) | 86.754 GHz | 86.66 – 86.84 GHz |
| Silicon monoxide (SiO) | 86.847 GHz | 86.76 – 86.93 GHz |
| Ethynyl radical (C2H) | 87.300 GHz | 87.21 – 87.39 GHz (5) |
