Astronomy Symbols

Astronomy Symbols
Age (stellar)
    * τ - Age
 
Astrometry parameters
    * Rv - radial velocity
    * μ - proper motion
    * π - parallax
    * J - Epoch
 
Cosmological parameters
    * h - Dimensionless Hubble parameter
    * H0 - Hubble constant
    * Λ - Cosmological constant
    * Ω - Density parameter
    * ρ - Density
    * ρc - Critical density
    * z - Redshift
 
Distance description
Distance description for Orbital and non-Orbital Parameters:
    * d - distance
          o d - in km = kilometer
          o d - in mi = mile, note, not an SI unit
          o d - in AU = astronomical unit
          o d - in ly = light-year
          o d - in kly = kilolight-year (1000 x 1ly)
          o d - in pc = parsec
          o d - in kpc = kiloparsec (1000 x 1pc)
    * DL - Luminosity distance, obtaining an objects distance using only visual aspects
 
Galaxy comparism
Galaxy type and spectral comparism:
    * see Galaxy morphological classification
 
Luminosity comparism:
    * LS - Luminosity compared to the Sun (Sol)
    * L☉ - Luminosity compared to the Sun (Sol)
 
Luminosity of certain object:
    * Lacc - Accretion luminosity
    * Lbol - Bolometric luminosity
 
Mass comparism:
    * ME - Mass compared to Earth
    * M⊕ - Mass compared to Earth
    * MJ - Mass compared to Jupiter
    * M♃ - Mass compared to Jupiter
    * MS - Mass compared to the Sun (Sol)
    * M☉ - Mass compared to The Sun (Sol)
 
Mass of certain object:
    * M●[1] - Mass of black hole
    * Macc - Mass of accretion disc
 
Metallicity comparism:
    * Fe/H - Iron ratio to Hydrogen
    * M/H - Metallicity ratio.
    * Z - Metallicity
    * ZS - Metallicity compared to the Sun (Sol)
    * Z☉ - Metallicity compared to the Sun (Sol)
 
Orbital parameters
Orbital Parameters of a Cosmic Object:
    * α - RA, right ascension, if the Greek letter does not appear, á letter will appear.
    * δ - Dec, declination, if the Greek letter does not appear, ä letter will appear.
    * P or Porb - orbital period
    * a - semi-major axis
    * b - semi-minor axis
    * q - periapsis, the minimum distance
    * Q - apsis, the maximum distance
    * e - eccentricity
    * i - inclination
    * Ω - longitude of ascending node
    * ω - argument of periapsis
    * RL - Roche lobe
    * M - Mean anomaly
    * Mo - Mean anomaly at epoch
 
Radius comparism:
    * RE - Radius compared to Earth
    * R⊕ - Radius compared to Earth
    * RJ - Radius compared to Jupiter
    * R♃ - Radius compared to Jupiter
    * RS - Radius compared to The Sun (Sol)
    * R☉ - Radius compared to The Sun (Sol)
 
Spectral comparism:
    * see Stellar classification
    * m(object) - Apparent magnitude
    * M(object) - Absolute magnitude, for galaxies and stars
    * H(object) - Absolute magnitude, for planets and nonstellar objects
 
Temperature description:
    * Teff - Temperature Effect, usually associated with luminous object
    * Tmax - Temperature Maximum, usually associated with non-luminous object
    * Tavg - Temperature Average, usually associated with non-luminous object
    * Tmin - Temperature Minimum, usually associated with non-luminous object
    * K - Kelvin