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physical object > natural object > celestial body > star > emission line star > T Tauri star > YY Orionis star
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YY Orionis star comparison table
Subject has spectral type is part of has extent has age has surface temperature is an instance of has velocity has surface density has star surface temperature has optical brightness variation has V magnitude has parallax has observational problem has light curve has position on celestial sphere has location has angular momentum has radiation at surface has B magnitude has temperature has spectra has proper motion has amplitude has energy source has energy production has catalog has absolute magnitude has U magnitude has volume has momentum has apparent magnitude has material has mass has name designated with has emission line has observable variation time scale has synonym has definition has spectra peculiarity
YY Orioniscooler than G2Orion  greater than 1000 KelvinYY Orionis stardetermined from proper motion and radial velocitywhich depends on luminosity class 0.2 magnitudes or greater from the point of view of Earth's orbitsome difficulty in distinguishing between various kinds from the point of view of Earthor center of gravity which is diffused out from the hotter core     gravitational contraction and or fusionwhich takes place primarily within the corestar catalog     hydrogen, heliumgreater than 0.08 the sun's mass
  1. R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
  2. RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
  3. AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
  4. V 335, V 336, etc., when the double letter designations are exhausted
 within a period of decadesnebular variableAn extremely young star (younger than T Tauri) in the Orion Nebula.inverse P Cyg type emission profiles in the Ca II HK lines

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