semi-major axis

half the length of the major axis of an elliptical orbit

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The National Science Foundation (NSF) and the US Department of Energy (DOE) will support Rubin Observatory in its operations phase to carry out the Legacy Survey of Space and Time. They will also provide support for scientific research with the data. During operations, NSF funding is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with NSF, and DOE funding is managed by SLAC National Accelerator Laboratory (SLAC), under contract by DOE. Rubin Observatory is operated by NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab) and SLAC.

NSF is an independent federal agency created by Congress in 1950 to promote the progress of science. NSF supports basic research and people to create knowledge that transforms the future.

We are privileged to conduct research on Cerro Pachón in Chile, and acknowledge the Indigenous communities in Chile as the natural protectors of these lands.