Astronomical Data Center

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-- UNITS & CONSTANTS -- [star graphic]

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Find the topic of interest to you and click on any of the references listed. References listed on this page are links to selected external (non-ADC) resources which may be of interest. The ADC is not responsible for the content of external sites linked from this page.

ASTRONOMICAL CONSTANTS

  • Solar and Planetary parameters (masses, radii, etc. from NSSDC factsheets)
  • General Data as listed in Zombeck, chapter 1
  • Physical Constants and Astronomical Data (C. Dolan)

    • additional selected Constants:
    Quantity Value
    Astronomical Unit (A.U.) 1.49597892 x 1013 cm
    parsec (pc) 3.086 x 1018 cm = 206265 A.U. = 3.26 ly
    light year (ly) 9.46 x 1017 cm = 0.307 pc
    steradian (sr) 3.2828 x 103 deg²
    Jansky (Jy) 1.0 x 10-26 W/m²/Hz

    PHYSICAL CONSTANTS

  • CODATA Recommended Values for Fundamental Physical Constants (NIST)
  • General Data as listed in Zombeck, chapter 1
  • Mathematical Constants (MathSoft, Inc.)

    • UNITS & CONVERSIONS

  • Unit Conversion Tables as listed in Zombeck, chapter 1
  • Unit Conversion calculator (Dept. of Chemistry, Freie University Berlin, Germany)
  • Lists of Unit Conversion factors (Washington State Department of Transportation)

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    Last Revised: 25 June 1999 (JEG)