Image: ESA Galileo Passive Hydrogen Maser

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Description: Space Passive Hydrogen Maser used in ESA Galileo satellites as a master clock for an onboard timing system. This atomic clock type uses the ultra stable 1,420,405,751.7667 hertz (Hz) transition in a hydrogen atom to measure time to within 0.45 nanoseconds over 12 hours. A timing error of 1 nanosecond or 1 billionth of a second (10−9 or 1/1,000,000,000 s) results in a 29.9792458 cm (11.8 in) positional error on Earth's surface. weight: 18 kg volume: 45 liters lifetime: 20 years
Title: ESA Galileo Passive Hydrogen Maser
Credit: Own work
Author: SkywalkerPL
Usage Terms: Creative Commons Attribution 3.0
License: CC BY 3.0
License Link: http://creativecommons.org/licenses/by/3.0
Attribution Required?: Yes

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