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yotta- +‎ candela


yottacandela (plural yottacandelas)

  1. (metrology) An SI unit of luminous intensity equal to 1024 candelas. Symbol: Ycd
    • 2011, Richard Dodd, Using SI Units in Astronomy, Cambridge University Press, page 20:
      Luminous intensity of an MV=0 star outside the earth's atmosphere ≃ 2.45 x 1029 cd (candela) (SI base unit) ¶ or 2.45 x 105 Ycd (yottacandela) (official SI prefix)