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Arrived at L 1 on 22 January 2016. [25] LISA Pathfinder was deactivated on 30 June 2017. [26] Solar and Heliospheric Observatory (SOHO) Sun–Earth L 1: ESA, NASA: Orbiting near L 1 since 1996. Operational as of 2020. [27] WIND: Sun–Earth L 1: NASA: Arrived at L 1 in 2004 with fuel for 60 years. Operational as of 2019. [28]
The location of L 1 is the solution to the following equation, gravitation providing the centripetal force: = (+) + where r is the distance of the L 1 point from the smaller object, R is the distance between the two main objects, and M 1 and M 2 are the masses of the large and small object, respectively.
Space Weather Follow On-Lagrange 1 (SWFO-L1) is a future spacecraft mission planned to monitor signs of solar storms, which may pose harm to Earth's telecommunication network. The spacecraft will be operated by the National Oceanic and Atmospheric Administration (NOAA), with launch scheduled for no earlier than September 2025. [ 1 ]
Along with Aditya-L1, Wind, Advanced Composition Explorer (ACE), and Deep Space Climate Observatory (DSCOVR), SOHO is one of five spacecraft in the vicinity of the Earth–Sun L1 point, a point of gravitational balance located approximately 0.99 astronomical unit (AU) from the Sun and 0.01 AU from the Earth.
DSCOVR takes full-Earth pictures about every two hours and is able to process them faster than other Earth observation satellites. [23] The spacecraft is in a looping halo orbit around the Sun-Earth Lagrange point L1 in a six-month period, with a spacecraft–Earth–Sun angle varying from 4° to 15°. [24] [25]
ERS-1 carried an array of Earth-observation instruments that gathered information about the Earth (land, water, ice, and atmosphere) using a variety of measurement principles. These included: RA (Radar Altimeter) is a single frequency nadir-pointing radar altimeter operating in the K u band.
EDAS is the single point of access for the data collected and generated by the EGNOS ground infrastructure distributed over Europe and North Africa, it is aimed at users who require enhanced performance for commercial and professional use. It has been available since 26 July 2012. [22]
L1 family, a protein family of cell adhesion molecules; L1 (protein), a cell adhesion molecule L1 or LINE1; transposable elements in the DNA; L 1, Lagrangian point 1, the most intuitive position for an object to be gravitationally stationary relative to two larger objects (such as a satellite with respect to the Earth and Moon)