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I don't think the 39m primary E-ELT is designed to do full sky surveys. AFAIK it is to do targeted observations using multiple instruments. The Vera Rubin (fka

• privong 3y ago
  > I don't think the 39m primary E-ELT is designed to do full sky surveys. AFAIK it is to do targeted observations using multiple instruments. Correct. I wasn't able to quickly find the maximum size of the FOV available at the E-ELT, but the FOVs of the first generation instruments[0] are not large enough to efficiently survey the sky. The largest FOV instrument for the E-ELT is 6.78arcmin across, compared to 3.5deg for the Rubin Observatory[1] (i.e., 960x larger area). The E-ELT is large (39m diameter vs 6.5m effective collecting area for Ruben). So the E-ELT has a factor of 36 more collecting area. However, the Etendue (collecting area * instantaneous FOV) of Ruben is 26x larger than that of the E-ELT. So for surveying a large portion of the sky to a fixed depth, Ruben is ~26x more efficient than the E-ELT. [0] https://www.eso.org/sci/facilities/eelt/instrumentation/phaseA.html https://www.eso.org/sci/facilities/eelt/instrumentation/phas... [1] https://www.lsst.org/scientists/keynumbers https://www.lsst.org/scientists/keynumbers
  • OldGuyInTheClub 3y ago
    Both magnificent but in different ways.