3C 273 is a quasar located in the constellation Virgo. It was the first quasar ever to be identified.
It is the optically-brightest quasar in our sky (m ~12.9), and one of the closest with a redshift, z, of 0.158.[4] A luminosity distance of DL = 749 megaparsecs (2.4 Gly) may be calculated from z
3C273也不是lz说的950Mpc阿