Retrieving "Sun Earth L2 Lagrange Point" from the archives

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1. Planck Satellite

   Linked via "Sun-Earth L2 Lagrange point"

   The Planck Satellite was the third space mission, following the Cosmic Background Explorer (COBE)/) and the Wilkinson Microwave Anisotropy Probe (WMAP)/), dedicated to mapping the anisotropies of the Cosmic Microwave Background (CMB)/) radiation across the entirety of the sky. Launched by the European Space Agency (ESA)/) in May 2009, Planck operated at the [Sun-Earth L2 Lagrang…

2. Planck Satellite

   Linked via "Sun-Earth L2 Lagrange point"

   Operational Orbit and Thermal Management
   Planck Satellite was positioned at the Sun-Earth L2 Lagrange point, approximately $1.5$ million kilometers from Earth in the direction opposite the Sun. This location provided a stable thermal environment and allowed the spacecraft to maintain continuous observation of the sky while keeping Earth and the Sun within a constant, narrow viewing angle (the Earth-Sun-Spacecraft angle was held fixed at $178.2 \pm 0.3$ degrees).
   The thermal manage…