Vera C. Rubin Observatory

The Vera C. Rubin Observatory, formerly the Large Synoptic Survey Telescope (LSST), is an astronomical observatory in Coquimbo Region, Chile. Its main task is to conduct an astronomical survey of the southern sky every few nights, creating a ten-year time-lapse record, termed the Legacy Survey of Space and Time (also abbreviated LSST). The observatory is located on the El Peñón peak of Cerro Pachón, a 2,682-meter-high (8,799 ft) mountain in northern Chile, alongside the existing Gemini South and Southern Astrophysical Research Telescopes. The base facility is located about 100 kilometres (62 miles) away from the observatory by road, in La Serena. The observatory is named for Vera Rubin, an American astronomer who pioneered discoveries about galactic rotation rates. It is a joint initiative of the U.S. National Science Foundation (NSF) and the U.S. Department of Energy's (DOE) Office of Science and is operated jointly by NSF NOIRLab and SLAC National Accelerator Laboratory. The Rubin Observatory houses the Simonyi Survey Telescope, a wide-field reflecting telescope with an 8.4-meter primary mirror. It uses a variant of three-mirror anastigmat to deliver sharp images over a 3.5-degree-diameter field of view. Images are recorded by a 3.2-gigapixel charge-coupled device imaging (CCD) camera, the largest camera yet constructed. Rubin saw first light in June 2025 and started full survey operations in July 2026, taking an image of the night sky every 40 seconds in order to complete a full scan of the southern sky every few days for the next ten years. The observatory is expected to catalog millions of supernovae, more than five million asteroids (including ~100,000 near-Earth objects), and image approximately 17 billion stars and 20 billion galaxies.

Name

The telescope was originally named the Large Synoptic Survey Telescope, where the word synoptic—derived from the Greek words σύν (syn 'together') and ὄψις (opsis 'view')—describes observations that give a broad view of a subject. In June 2019, the observatory was renamed the Vera C. Rubin Observatory as proposed by United States Representative Eddie Bernice Johnson and Resident Commissioner of Puerto Rico Jenniffer González-Colón. The renaming was enacted as United States law on 20 December 2019, and announced at the 2020 American Astronomical Society winter meeting. The name honors Rubin and her colleagues' probes of the nature of dark matter by mapping and cataloging billions of galaxies through space and time. The telescope itself is named the Simonyi Survey Telescope, in recognition of private donors Charles and Lisa Simonyi. The LSST acronym was repurposed to refer to the survey that the observatory will perform as the "Legacy Survey of Space and Time", with the camera as the "LSST Camera".

History The Rubin Observatory was proposed in 2001 as the LSST. Construction of the mirror began in 2007 with private funds. The LSST then became the top-ranked large ground-based project in the 2010 Astrophysics Decadal Survey, and officially began construction on 1 August 2014. Funding came from the NSF, DOE, and private funding raised by the private LSST Discovery Alliance. Operations are managed by the Association of Universities for Research in Astronomy (AURA). Construction cost was expected to be about $680 million. Site construction began in April 2015. The first pixel with the engineering camera came in October 2024, while system first light images were released 23 June 2025. Full survey operations began on 30 June 2026, having been delayed by COVID-related issues. The Rubin Observatory is the successor to a tradition of sky surveys. These started as visually-compiled catalogs in the 18th century, such as the Messier catalog. This was replaced by photographic surveys, starting with the 1885 Harvard Plate Collection, the National Geographic Society – Palomar Observatory Sky Survey, and others. By about 2000, the first digital surveys, such as the Sloan Digital Sky Survey (SDSS), began to replace the earlier photographic plate surveys. The Rubin Observatory evolved from the Dark Matter Telescope, mentioned as early as 1996. The fifth decadal report, Astronomy and Astrophysics in the New Millennium, was released in 2001, and recommended the "Large-Aperture Synoptic Survey Telescope" as a major initiative. Even at this early stage the basic design and objectives were set:

The Large-aperture Synoptic Survey Telescope (LSST) is a 6.5-m-class optical telescope designed to survey the visible sky every week down to a much fainter level than that reached by existing surveys. It will catalog 90 percent of the near-Earth objects larger than 300 m and assess the threat they pose to life on Earth. It will find some 10,000 primitive objects in the Kuiper Belt, which contains a fossil record of the formation of the solar system. It will also contribute to the study of the structure of the universe by observing thousands of supernovae, both nearby and at large redshift, and by measuring the distribution of dark matter through gravitational lensing. All the data will be available through the National Virtual Observatory, providing access for astronomers and the public to very deep images of the changing night sky. Early development was funded by small grants, with major contributions in January 2008 by software billionaires Charles and Lisa Simonyi and Bill Gates, of $20 million and $10 million, respectively. $7.5 million was included in the U.S. President's FY2013 NSF budget request. DOE funded the digital camera component built by the SLAC National Accelerator Laboratory, as part of its mission to understand dark energy. NSF funding for the rest of construction was authorized on 1 August 2014. The lead organizations are:

The SLAC National Accelerator Laboratory to design and construct the LSST camera The National Optical Astronomy Observatory to provide the telescope and site team The National Center for Supercomputing Applications to construct and test the archive and data access center The Association of Universities for Research in Astronomy to oversee construction In May 2018, the United States appropriated more funding for the telescope than had been requested, to speed construction and operation. Telescope management was unsure this would help, since at that stage of construction they were not cash-limited.

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