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. A luminosity distance of DL = 2.4 Giga light years (749 Mpc) may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of -26.7. Its mass has been measured to be 886 ± 187 million solar masses through broad emission-line reverberation mapping.
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MAM MB33 mk2
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