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Key Numbers

LSST System & Survey Key Numbers

This page lists Key Numbers that describe the LSST system and survey and is a subset of numbers available on the LSST Knowledge Base Confluence page.  More detailed information is available in the LSST Overview Paper and Science Requirements Document.  (Page last updated 11/08/2018)


 

Optical System:
  Etendue ( AΩ ) = 319 meter2degrees2
  Field of View =  3.5 degrees (9.6 square degrees)
  Primary mirror diameter =  8.4 m
  Effective clear aperture =  6.68 m (on-axis)
  Mean effective aperture = 6.423 m (area weighted over FOV)
  Final f-ratio =  f/1.234
  Plate scale =  50.9 microns/arcsec

Imaging System:
  Pixel count =  3.2 Gpixels
  Readout time =  2 sec
  Dynamic range =  18 bits
  Pixel pitch = 10 micron (0.2 arcsec)

Spectral Response:
  Full bandpass range = 320-1050 nm
  Total number of filters = 6
  Number of active filters =  5
  System 50% response points (nm)
    u  324  395
    g  405  552
    r   552  691
    i   691  818
    z  818  921
    y  922  997 

Survey Area:
  Fiducial main survey area = 18,000 deg2
  Total covered area (est.) = 25,000 deg^2
    (main survey + special programs)
  Fiducial number of visits per pointing in the main survey = 825

Network bandwidths:
  Summit (Pachón) to Base (La Serena) =  600 Gbps
  Base (La Serena) to Archive (NCSA) = 2 x 100 Gbps

 

Observation Properties:
  The standard visit = 2 x 15 sec. exposures
  Exposure sequence = 1 s open shutter + 14 s dwell + 1 s close shutter = 16 s
  Visit sequence = 16 s exp + 2 s readout + 16 sec exp = 34 s
  (second readout concurrent with slew)
  Median slew time between visits = 4.8 s
  Mean slew time between visits = 6.8 s
  Visits per night = "about a 1000"
  Calibration exposures = 450/day
  Data collected per 24 hr period = "about 20 TB"

Data Releases:
  Number of Data Releases = 11
  Date of DR1 release = Date of Operations Start+ 12 months
  Estimated counts for DR1 release
    Objects = 18 billion
    Sources = 350 billion (single epoch)
    Forced Sources = 0.75 trillion  

  Estimated counts for DR11
    Objects = 37 billion
    Sources = 7 trillion (single epoch)
    Forced Sources = 30 trillion
    Visits observed = 2.75 million
    Images collected = 5.5 million 3.2 Gigapixel images

Alert Production:
  Real-time alert latency =  60 seconds
  Estimated number of alerts per night=  up to about 10 million

Data and compute sizes:
  Final volume of raw image data = 60 PB
Final image collection (DR11) = 0.5 Exabytes
  Final catalog size (DR11) = 15 PB
  Final disk storage = 0.4 Exabytes
  Peak number of nodes  = 1750 nodes
  Peak compute power in LSST data centers = about 2 PFLOPS

Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC).
The National Science Foundation (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.   




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