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Vera C. Rubin Observatory

(Redirected from Legacy Survey of Space and Time)

The Vera C. Rubin Observatory, formerly known as the Large Synoptic Survey Telescope (LSST), is an astronomical observatory under construction in Chile. Its main task will be carrying out a synoptic astronomical survey, the Legacy Survey of Space and Time.[11][12] The word "synoptic" is derived from the Greek words σύν (syn "together") and ὄψις (opsis "view"), and describes observations that give a broad view of a subject at a particular time. The observatory is located on the El Peñón peak of Cerro Pachón, a 2,682-meter-high mountain in Coquimbo Region, in northern Chile, alongside the existing Gemini South and Southern Astrophysical Research Telescopes.[13] The LSST Base Facility is located about 100 kilometres (62 miles) away from the observatory by road, in the town of La Serena. The observatory is named for Vera Rubin, an American astronomer who pioneered discoveries about galaxy rotation rates.

Vera C. Rubin Observatory
Rendering of completed LSST
Alternative namesLSST Edit this at Wikidata
Named afterVera Rubin Edit this on Wikidata
Location(s)Elqui Province, Coquimbo Region, Chile
Coordinates30°14′40.7″S 70°44′57.9″W / 30.244639°S 70.749417°W / -30.244639; -70.749417[1][3][4]
OrganizationLarge Synoptic Survey Telescope Corporation Edit this on Wikidata
Observatory code X05 Edit this on Wikidata
Altitude2,663 m (8,737 ft), top of pier[1][5]
Wavelength320–1060 nm[6]
First lightExpected in January 2025[7]
Telescope styleThree-mirror anastigmat, Paul-Baker / Mersenne-Schmidt wide-angle[8]
Diameter8.417 m (27.6 ft) physical
8.360 m (27.4 ft) optical
5.116 m (16.8 ft) inner[9][10]
Secondary diameter3.420 m (1.800 m inner)[9]
Tertiary diameter5.016 m (1.100 m inner)[9][10]
Angular resolution0.7″ median seeing limit
0.2″ pixel size[6]
Collecting area35 square meters (376.7 sq ft)[6]
Focal length10.31 m (f/1.23) overall
9.9175 m (f/1.186) primary
Mountingaltazimuth mount Edit this on Wikidata
Websitehttp://rubinobservatory.org/
Vera C. Rubin Observatory is located in Chile
Vera C. Rubin Observatory
Location of Vera C. Rubin Observatory
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The Rubin Observatory will house the Simonyi Survey Telescope,[14] a wide-field reflecting telescope with an 8.4-meter primary mirror[9][10] that will photograph the entire available sky every few nights.[15] The telescope uses a novel three-mirror design, a variant of three-mirror anastigmat, which allows a compact telescope to deliver sharp images over a very wide 3.5-degree diameter field of view. Images will be recorded by a 3.2-gigapixel charge coupled device imaging (CCD) camera, the largest digital camera ever constructed.[16]

The LSST was proposed in 2001, and construction of the mirror began (with private funds) in 2007. LSST then became the top-ranked large ground-based project in the 2010 Astrophysics Decadal Survey, and the project officially began construction 1 August 2014 when the United States National Science Foundation (NSF) authorized the FY2014 portion ($27.5 million) of its construction budget.[17] Funding comes from the NSF, the United States Department of Energy, and private funding raised by the dedicated international non-profit organization, the LSST Discovery Alliance. Operations are under the management of the Association of Universities for Research in Astronomy (AURA).[18] Total construction cost is expected to be about $680 million.[19]

Site construction began on 14 April 2015 with the ceremonial laying of the first stone.[20][21] First light for the engineering camera is expected in August 2024,[22] while system first light is expected in January 2025 and full survey operations are aimed to begin in August 2025, due to COVID-related schedule delays.[23] LSST data is scheduled to become fully public after two years.[24]

Name

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Vera C. Rubin Observatory and the Milky Way

In June 2019, the renaming of the observatory from the Large Synoptic Survey Telescope (LSST) to the Vera C. Rubin Observatory was initiated by United States Representative Eddie Bernice Johnson and Jenniffer González-Colón.[25] The renaming was enacted into United States law on December 20, 2019,[26] and announced at the 2020 American Astronomical Society winter meeting.[12] The observatory is named after Vera C. Rubin. The name honors Rubin and her colleagues' legacy to probe the nature of dark matter by mapping and cataloging billions of galaxies through space and time.[25]

The telescope itself is named the Simonyi Survey Telescope, after private donors Charles and Lisa Simonyi.[27]

History

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The L1 lens for the LSST, 2018

The LSST is the successor to a tradition of sky surveys.[28] 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 photographic plates of the earlier surveys.

LSST evolved from the earlier concept of the Dark Matter Telescope,[29] mentioned as early as 1996.[30] The fifth decadal report, Astronomy and Astrophysics in the New Millennium, was released in 2001,[31] 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 a number of 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.[32][27] $7.5 million was included in the U.S. President's FY2013 NSF budget request.[33] The United States Department of Energy is funding construction of the digital camera component by the SLAC National Accelerator Laboratory, as part of its mission to understand dark energy.[34]

In the 2010 decadal survey, LSST was ranked as the highest-priority ground-based instrument.[35]

NSF funding for the rest of construction was authorized as of 1 August 2014.[17] The lead organizations are:[34]

In May 2018, the United States Congress surprisingly appropriated much more funding than the telescope had asked for, in hopes of speeding construction and operation. Telescope management was thankful but unsure this would help, since at the late stage of construction they were not cash-limited.[19]

As of May 2022, the project critical path was the camera installation, integration and testing.[36]

Overview

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The Simonyi Survey Telescope design is unique among large telescopes (8 m-class primary mirrors) in having a very wide field of view: 3.5 degrees in diameter, or 9.6 square degrees. For comparison, both the Sun and the Moon, as seen from Earth, are 0.5 degrees across, or 0.2 square degrees. Combined with its large aperture (and thus light-collecting ability), this will give it a spectacularly large etendue of 319 m2⋅degree2.[6] This is more than three times the etendue of the largest-view existing telescopes, the Subaru Telescope with its Hyper Suprime Camera[37] and Pan-STARRS, and more than an order of magnitude better than most large telescopes.[38]

Optics

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The LSST primary/tertiary mirror successfully cast, August 2008
 
Optics of the LSST Telescope

The earliest reflecting telescopes used spherical mirrors which, although easy to fabricate and test, suffer from spherical aberration; a long focal length was needed to reduce spherical aberration to a tolerable level. Making the primary mirror parabolic removes spherical aberration on-axis, but the field of view is then limited by off-axis coma. Such a parabolic primary, with either a prime or Cassegrain focus, was the most common optical design up through the Hale Telescope in 1949. After that, telescopes used mostly the Ritchey–Chrétien design, using two hyperbolic mirrors to remove both spherical aberration and coma, giving a wider useful field of view limited only by astigmatism and higher order aberrations. Most large telescopes since the Hale use this design—the Hubble and Keck telescopes are Ritchey–Chrétien, for example. LSST will use a three-mirror anastigmat to cancel astigmatism by employing three non-spherical mirrors. The result is sharp images over a wide field of view, but at the expense of some light-gathering power due to the large tertiary mirror obscuring part of the optical path.[9]

The telescope's primary mirror (M1) is 8.4 meters (28 ft) in diameter, the secondary mirror (M2) is 3.4 meters (11.2 ft) in diameter, and the tertiary mirror (M3), inside the ring-like primary, is 5.0 meters (16 ft) in diameter. The secondary mirror is expected to be the largest convex mirror in any operating telescope, until surpassed by the Extremely Large Telescope's 4.2 m secondary in about 2028. The second and third mirrors reduce the primary mirror's light-collecting area to 35 square meters (376.7 sq ft), equivalent to a 6.68-meter-diameter (21.9 ft) telescope.[6] Multiplying this by the field of view produces an étendue of 336 m2⋅degree2; the actual figure is reduced by vignetting.[39]

The primary and tertiary mirrors (M1 and M3) are designed as a single piece of glass, the "M1M3 monolith". Placing the two mirrors in the same location minimizes the overall length of the telescope, making it easier to reorient quickly. Making them out of the same piece of glass results in a stiffer structure than two separate mirrors, contributing to rapid settling after motion.[9]

The optics includes three corrector lenses to reduce aberrations. These lenses, and the telescope's filters, are built into the camera assembly. The first lens, at 1.55 m diameter, is the largest lens ever built,[40] and the third lens forms the vacuum window in front of the focal plane.[39]

Unlike many telescopes,[41] the Rubin Observatory makes no attempt to compensate for dispersion in the atmosphere. Such correction, which requires re-adjusting an additional element in the optical train, would be very difficult in the 5 seconds allowed between pointings, plus is a technical challenge due to the extremely short focal length. As a result, shorter wavelength bands away from the zenith will have somewhat reduced image quality.[42]

Wavefront sensing

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The Simonyi telescope uses an active optics system, with wavefront sensors at the corners of the camera, to keep the mirrors accurately figured and in focus. The field of view is too large to use adaptive optics to correct for atmospheric seeing. The process occurs in three stages:[43] (1) Laser tracker measurements are used to make sure the components are centered and are close to the intended positions. (2) Open loop corrections are applied to correct for intrinsic mirror aberrations, component sag as a function of elevation and temperature, and filter selection. (3) Focus and figure measurements are made during normal operation by sensors at the corners of the field of view, and used to correct the optics.

 
Diagram of the Active Optics sensors for the Vera Rubin telescope

The precise shape and focus of the mirror assembly is estimated, and then corrected, by comparing the images on four sets of deliberately defocused CCDs (one in front of the focal plane and one behind, see figure at right). Two methods for finding these corrections have been developed. One proceeds analytically, estimating a Zernike polynomial description of the current shape of the mirror, and from this computing a set of corrections to restore figure and focus. The other method uses machine learning to directly compute the corrections from the out of focus images. Both methods appear capable of meeting the design goals.

Camera

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The LSST camera sensor
 
Life-size model of the LSST focal plane array. The array's diameter is 64 cm, and will provide 3.2 gigapixels per image. The image of the Moon (30 arcminutes) is present to show the scale of the field of view. The model is held by Suzanne Jacoby, the Rubin Observatory communications director.

A 3.2-gigapixel prime focus[note 1] digital camera will take a 15-second exposure every 20 seconds.[6] Repointing such a large telescope (including settling time) within 5 seconds requires an exceptionally short and stiff structure. This in turn implies a small f-number, which requires precise focusing of the camera.[44]

The 15-second exposures are a compromise to allow spotting both faint and moving sources. Longer exposures would reduce the overhead of camera readout and telescope re-positioning, allowing deeper imaging, but then fast moving objects such as near-Earth objects would move significantly during an exposure.[45] Each spot on the sky is imaged with two consecutive 15 second exposures, to efficiently reject cosmic ray hits on the CCDs.[46]

The camera focal plane is flat and 64 cm in diameter. The main imaging is performed by a mosaic of 189 CCD detectors, each with 16 megapixels.[47] They are grouped into a 5×5 grid of "rafts", where the central 21 rafts contain 3×3 imaging sensors, while the four corner rafts contain only three CCDs each, for guiding and focus control. The CCDs provide better than 0.2 arcsecond sampling, and will be cooled to approximately −100 °C (173 K) to help reduce noise.[48]

The camera includes a filter located between the second and third lenses, and an automatic filter-changing mechanism. Although the camera has six filters (ugrizy) covering 330–1080 nm wavelengths,[49] the camera's position between the secondary and tertiary mirrors limits the size of its filter changer. It can hold five filters at a time, so each day one of the six must be chosen to be omitted for the following night.[50]

Image data processing

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Scan of Flammarion engraving taken with LSST in September 2020 [51]

Allowing for maintenance, bad weather and other contingencies, the camera is expected to take over 200,000 pictures (1.28 petabytes uncompressed) per year, far more than can be reviewed by humans. Managing and effectively analyzing the enormous output of the telescope is expected to be the most technically difficult part of the project.[52][53] In 2010, the initial computer requirements were estimated at 100 teraflops of computing power and 15 petabytes of storage, rising as the project collects data.[54] By 2018, estimates had risen to 250 teraflops and 100 petabytes of storage.[55]

Once images are taken, they are processed according to three different timescales, prompt (within 60 seconds), daily, and annually.[56]

The prompt products are alerts, issued within 60 seconds of observation, about objects that have changed brightness or position relative to archived images of that sky position. Transferring, processing, and differencing such large images within 60 seconds (previous methods took hours, on smaller images) is a significant software engineering problem by itself.[57] Approximately 10 million alerts will be generated per night.[58] Each alert will include the following:[59]: 22 

  • Alert and database ID: IDs uniquely identifying this alert
  • The photometric, astrometric, and shape characterization of the detected source
  • 30×30 pixel (on average) cut-outs of the template and difference images (in FITS format)
  • The time series (up to a year) of all previous detections of this source
  • Various summary statistics ("features") computed of the time series

There is no proprietary period associated with alerts—they are available to the public immediately, since the goal is to quickly transmit nearly everything LSST knows about any given event, enabling downstream classification and decision making. LSST will generate an unprecedented rate of alerts, hundreds per second when the telescope is operating.[note 2] Most observers will be interested in only a tiny fraction of these events, so the alerts will be fed to "event brokers" which forward subsets to interested parties. LSST will provide a simple broker,[59]: 48  and provide the full alert stream to external event brokers.[60] The Zwicky Transient Facility will serve as a prototype of LSST system, generating 1 million alerts per night.[61]

Daily products, released within 24 hours of observation, comprise the images from that night, and the source catalogs derived from difference images. This includes orbital parameters for Solar System objects. Images will be available in two forms: Raw Snaps, or data straight from the camera, and Single Visit Images, which have been processed and include instrumental signature removal (ISR), background estimation, source detection, deblending and measurements, point spread function estimation, and astrometric and photometric calibration.[62]

Annual release data products will be made available once a year, by re-processing the entire science data set to date. These include:

  • Calibrated images
  • Measurements of positions, fluxes, and shapes
  • Variability information
  • A compact description of light curves
  • A uniform reprocessing of the difference-imaging-based prompt data products
  • A catalog of roughly 6 million Solar Systems objects, with their orbits
  • A catalog of approximately 37 billion sky objects (20 billion galaxies and 17 billion stars), each with more than 200 attributes.[55]

The annual release will be computed partially by the National Center for Supercomputing Applications, and partially by IN2P3 in France.[63]

LSST is reserving 10% of its computing power and disk space for user generated data products. These will be produced by running custom algorithms over the LSST data set for specialized purposes, using application programming interfaces (APIs) to access the data and store the results. This avoids the need to download, then upload, huge quantities of data by allowing users to use the LSST storage and computation capacity directly. It also allows academic groups to have different release policies than LSST as a whole.

An early version of the LSST image data processing software is being used by the Subaru Telescope's Hyper Suprime-Cam instrument,[64] a wide-field survey instrument with a sensitivity similar to LSST but one fifth the field of view: 1.8 square degrees versus the 9.6 square degrees of LSST. New software called HelioLinc3D was developed specifically for the Rubin Observatory, to detect moving objects.[65]

Scientific goals

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Comparison of primary mirrors of several optical telescopes – (The LSST, with its very large central hole, is near the center of the diagram.)

LSST will cover about 18,000 deg2 of the southern sky with six filters in its main survey, with about 825 visits to each spot. The 5σ (SNR greater than 5) magnitude limits are expected to be r < 24.5 in single images, and r < 27.8 in the full stacked data.[66]

The main survey will use about 90% of the observing time. The remaining 10% will be used to obtain improved coverage for specific goals and regions. This includes very deep (r ~ 26) observations, very short revisit times (roughly one minute), observations of "special" regions such as the ecliptic, galactic plane, and the Large and Small Magellanic Clouds, and areas covered in detail by multi-wavelength surveys such as COSMOS and the Chandra Deep Field South.[46] Combined, these special programs will increase the total area to about 25,000 deg2.[6]

Particular scientific goals of the LSST include:[67]

Because of its wide field of view and sensitivity, LSST is expected to be among the best prospects for detecting optical counterparts to gravitational wave events detected by LIGO and other observatories.[71]

It is also hoped that the vast volume of data produced will lead to additional serendipitous discoveries.

NASA has been tasked by the U.S. Congress with detecting and cataloging 90% of the near Earth orbit population of size 140 meters or greater.[72] LSST, by itself, is estimated to be capable of detecting 62% of such objects,[73] and according to the United States National Academy of Sciences, extending its survey from ten years to twelve would be the most cost-effective way of finishing the task.[74]

Rubin Observatory has a program of Education and Public Outreach (EPO). Rubin Observatory EPO will serve four main categories of users: the general public, formal educators, citizen science principal investigators, and content developers at informal science education facilities.[75][76] Rubin Observatory will partner with Zooniverse for a number of their citizen science projects.[77]

Comparison with other sky surveys

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Top-end assembly lowered by 500-ton crane

There have been many other optical sky surveys, some still on-going. For comparison, here are some of the main currently used optical surveys, with differences noted:

  • Photographic sky surveys, such as the National Geographic Society – Palomar Observatory Sky Survey and its digitized version, the Digitized Sky Survey. This technology is obsolete, with much less depth, and in general taken from locations with less than excellent views. These archives are still used since they span a rather large time interval—more than 100 years in some cases—and cover the entire sky. The plate scans reached a limit of R~18 and B~19.5 over 90% of the sky, and about one magnitude fainter over 50% of the sky.[78]
  • The Sloan Digital Sky Survey (SDSS) (2000–2009) surveyed 14,555 square degrees of the northern hemisphere sky with a 2.5 meter telescope. It continues to the present day as a spectrographic survey. Its limiting photometric magnitude ranged from 20.5 to 22.2, depending on the filter.[79]
  • Pan-STARRS (2010–present) is an ongoing sky survey using two wide-field 1.8 m Ritchey–Chrétien telescopes located at Haleakala in Hawaii. Until LSST begins operation, it will remain the best detector of near-Earth objects. Its coverage, 30,000 square degrees, is comparable to what LSST will cover. The single image depth in the PS1 survey was between magnitude 20.9–22.0 depending on filter.[80]
  • The DESI Legacy Imaging Surveys (2013–present) looks at 14,000 square degrees of the northern and southern sky with the Bok 2.3-m telescope, the 4-meter Mayall telescope and the 4-meter Víctor M. Blanco Telescope. The Legacy Surveys make use of the Mayall z-band Legacy Survey, the Beijing–Arizona Sky Survey and the Dark Energy Survey. The Legacy Surveys avoided the Milky Way since it was primarily concerned with distant galaxies.[81] The area of DES (5,000 square degrees) is entirely contained within the anticipated survey area of LSST in the southern sky.[82] Its exposures typically reach magnitude 23–24.
  • Gaia is an ongoing space-based survey of the entire sky since 2014, whose primary goal is extremely precise astrometry of roughly two billion stars, quasars, galaxies and sun system objects. Its collecting area of 0.7 m2 does not allow observation of objects as faint as can be included in other surveys, but the location of each object observed is known with far greater precision. While not taking exposures in the traditional sense, it detects objects up to a magnitude of 21.
  • The Zwicky Transient Facility (2018–present) is a similar, rapid, wide-field survey to detect transient events. The telescope has an even larger field of view (47 square degrees; 5× the field), but a significantly smaller aperture (1.22 m; 1/30 the area). It is being used to develop and test the LSST automated alert software. Its exposures typically reach magnitude 20–21.
  • The Space Surveillance Telescope (2011–present) is a similar rapid wide-field survey telescope used primarily for military applications, with secondary civil applications including space debris and NEO detection and cataloguing.

Construction progress

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Construction progress of the LSST observatory building at Cerro Pachón as of September 2019
 
Construction progress of the LSST observatory building at Cerro Pachón as of 2022

The Cerro Pachón site was selected in 2006. The main factors were the number of clear nights per year, seasonal weather patterns, and the quality of images as seen through the local atmosphere (seeing). The site also needed to have an existing observatory infrastructure, to minimize costs of construction, and access to fiber optic links, to accommodate the 30 terabytes of data LSST will produce each night.[83]

As of February 2018, construction was well underway. The shell of the summit building was complete, and 2018 saw the installation of major equipment, including HVAC, the dome, mirror coating chamber, and the telescope mount assembly. It also saw the expansion of the AURA base facility in La Serena and the summit dormitory shared with other telescopes on the mountain.[58]

By February 2018, the camera and telescope shared the critical path. The main risk was deemed to be whether sufficient time was allotted for system integration.[84]

As of 2017, the project remained within budget, although the budget contingency was tight.[58]

In March 2020, work on the summit facility, and the main camera at SLAC, was suspended due to the COVID-19 pandemic, though work on software continued.[85] During this time, the commissioning camera arrived at the base facility and was tested there. It was moved to the summit and installed on the mount in August 2022.[86]

Mirrors

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Artist's conception of the LSST inside its dome. The LSST will carry out a deep, ten-year imaging survey in six broad optical bands over the main survey area of 18,000 square degrees.

The primary mirror, the most critical and time-consuming part of a large telescope's construction, was made over a 7-year period by the University of Arizona's Steward Observatory Mirror Lab.[87] Construction of the mold began in November 2007,[88] mirror casting was begun in March 2008,[89] and the mirror blank was declared "perfect" at the beginning of September 2008.[90] In January 2011, both M1 and M3 figures had completed generation and fine grinding, and polishing had begun on M3.

The mirror was formally accepted on 13 February 2015,[91][92] then placed in the mirror transport box and stored in an airplane hangar.[93] In October 2018, it was moved back to the mirror lab and integrated with the mirror support cell.[94] It went through additional testing in January/February 2019, then was returned to its shipping crate. In March 2019, it was sent by truck to Houston, Texas,[95] was placed on a ship for delivery to Chile,[96] and arrived on the summit in May.[97] There it will be re-united with the mirror support cell and coated.

The coating chamber, which was used to coat the mirrors once they arrived, itself arrived at the summit in November 2018.[94]

The secondary mirror was manufactured by Corning of ultra low expansion glass and coarse-ground to within 40 μm of the desired shape.[4] In November 2009, the blank was shipped to Harvard University for storage[98] until funding to complete it was available. On 21 October 2014, the secondary mirror blank was delivered from Harvard to Exelis (now a subsidiary of Harris Corporation) for fine grinding.[99] The completed mirror was delivered to Chile on 7 December 2018,[94] and was coated in July 2019.[100]

Building

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Cutaway rendering of the telescope, dome, and support building

Site excavation began in earnest on 8 March 2011,[101] and the site had been leveled by the end of 2011.[102] Also during that time, the design progressed, with significant improvements to the mirror support system, stray-light baffles, wind screen, and calibration screen.

In 2015, a large amount of broken rock and clay was found under the site of the support building adjacent to the telescope. This caused a 6-week construction delay while it was dug out and the space filled with concrete. This did not affect the telescope proper or its dome, whose much more important foundations were examined more thoroughly during site planning.[103][104]

The building was declared substantially complete in March 2018.[105] The dome was expected to be complete in August 2018,[58] but a picture from May 2019 showed it still incomplete.[97] The (still incomplete) Rubin Observatory dome first rotated under its own power in November 2019.[106]

Telescope mount assembly

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Telescope Mount Assembly of the 8.4-meter Simonyi Survey Telescope at Vera C. Rubin Observatory, under construction atop Cerro Pachón in Chile

The telescope mount, and the pier on which it sits, are substantial engineering projects in their own right. The main technical problem is that the telescope must slew 3.5 degrees to the adjacent field and settle within four seconds.[note 3][107]: 10  This requires a very stiff pier and telescope mount, with very high speed slew and acceleration (10°/sec and 10°/sec2, respectively[108]). The basic design is conventional: an altitude over azimuth mount made of steel, with hydrostatic bearings on both axes, mounted on a pier which is isolated from the dome foundations. The LSST pier is unusually large (16 m diameter), robust (1.25 m thick walls) and mounted directly to virgin bedrock,[107] where care was taken during site excavation to avoid using explosives that would crack it.[104]: 11–12  Other unusual design features are linear motors on the main axes and a recessed floor on the mount. This allows the telescope to extend slightly below the azimuth bearings, giving it a very low center of gravity.

The contract for the Telescope Mount Assembly was signed in August 2014.[109] It passed its acceptance tests in 2018[94] and arrived at the construction site in September 2019.[110] By April 2023, the mount was declared "essentially complete" and turned over to the Rubin Observatory.[111]

Camera construction

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In August 2015, the LSST Camera project, which is separately funded by the U.S. Department of Energy (DoE), passed its "critical decision 3" design review, with the review committee recommending DoE formally approve start of construction.[112] On August 31, the approval was given, and construction began at SLAC in California.[113] As of September 2017, construction of the camera was 72% complete, with sufficient funding in place (including contingencies) to finish the project.[58] By September 2018, the cryostat was complete, the lenses ground, and 12 of the 21 needed rafts of CCD sensors had been delivered.[114] As of September 2020, the entire focal plane was complete and undergoing testing.[115] By October 2021, the last of the six filters needed by the camera had been finished and delivered.[116] By November 2021, the entire camera had been cooled to its required operating temperature, so final testing could begin.[117]

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    Rendering of the LSST camera
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    Color-coded cutaway drawing of the LSST camera
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    Exploded view of the optical components of the LSST camera
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    Vera C. Rubin Observatory Commissioning Camera install

Before the final camera is installed, a smaller and simpler version (the Commissioning Camera, or ComCam) will be used "to perform early telescope alignment and commissioning tasks, complete engineering first light, and possibly produce early usable science data".[118]

The camera was reported as completed in early 2024.[119] The camera arrived at the observatory in May 2024.[120]

Data transport

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The data must be transported from the camera, to facilities at the summit, to the base facilities, and then to the LSST Data Facility at the National Center for Supercomputing Applications (NCSA) in the United States.[121] This transfer must be very fast (100 Gbit/s or better) and reliable since NCSA is where the data will be processed into scientific data products, including real-time alerts of transient events. This transfer uses multiple fiber optic cables from the base facility in La Serena to Santiago, Chile, then via two redundant routes to Miami, Florida, where it connects to existing high speed infrastructure. These two redundant links were activated in March 2018 by the AmLight consortium.[122]

Since the data transfer crosses international borders, many different groups are involved. These include the Association of Universities for Research in Astronomy (AURA, Chile and the USA), REUNA[123] (Chile), Florida International University (USA), AmLightExP[122] (USA), RNP[124] (Brazil), and University of Illinois Urbana-Champaign NCSA (USA), all of which participate in the LSST Network Engineering Team (NET). This collaboration designs and delivers end-to-end network performance across multiple network domains and providers.

Possible impact of satellite constellations

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A study in 2020 by the European Southern Observatory estimated that up to 30% to 50% of the exposures around twilight with the Rubin Observatory would be severely affected by satellite constellations. Survey telescopes have a large field of view and they study short-lived phenomena like supernova or asteroids,[125] and mitigation methods that work on other telescopes may be less effective. The images would be affected especially during twilight (50%) and at the beginning and end of the night (30%). For bright trails the complete exposure could be ruined by a combination of saturation, crosstalk (far away pixels gaining signal due to the nature of CCD electronics), and ghosting (internal reflections within the telescope and camera) caused by the satellite trail, affecting an area of the sky significantly larger than the satellite path itself during imaging. For fainter trails only a quarter of the image would be lost.[126] A previous study by the Rubin Observatory found an impact of 40% at twilight and only nights in the middle of the winter would be unaffected.[127]

Possible approaches to this problem would be a reduction of the number or brightness of satellites, upgrades to the telescope's CCD camera system, or both. Observations of Starlink satellites showed a decrease of the satellite trail brightness for darkened satellites. This decrease is not enough to mitigate the effect on wide-field surveys like the one conducted by the Rubin Observatory.[128] Therefore SpaceX is introducing a sunshade on newer satellites, to keep the portions of the satellite visible from the ground out of direct sunlight. The objective is to keep the satellites above 7th magnitude, to avoid saturating the detectors.[129] This limits the problem to only the trail of the satellite and not the whole image.[130] As of 2023, Starlink generation 2 "mini" satellites have achieved mean apparent magnitudes greater than 7.[131]

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  •  
    Clear skies at Cerro Pachón [132]
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    Vera C. Rubin Observatory under construction [133]
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    Telescope mount assembly, taken from the dome during bridge crane installation [134]
  •  
    Focal plane of the LSST Cam. It is 60 cm (2 feet) wide, has 189 sensors to produce 3200-megapixel images. [135]
  •  
    Optical engineers Justin Wolfe (left) and Simon Cohen with the r filter for the LSST Cam [136]
  •  
    The LSST Cam chilled to subzero temperatures using both cooling systems [137]
  •  
    Comet Leonard, the Rubin Observatory, the planet Venus, and various stars
  •  
    Night Light over Vera C. Rubin Observatory with the brightening of the sky due to the artificial light that can be seen as clusters of bright lights on the horizon

Notes

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  1. ^ The camera is actually at the tertiary focus, not the prime focus, but being located at a "trapped focus" in front of the primary mirror, the associated technical problems are similar to those of a conventional prime-focus survey camera.
  2. ^ 10 million events per 10 hour night is 278 events per second.
  3. ^ Five seconds are allowed between exposures, but one second is reserved for the mirrors and instrument to be aligned, leaving four seconds for the structure.

See also

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References

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