Ton 202, A Quasi-Stellar Radio Source

Jesse L. Greenstein, J. B. Oke
1970 Publications of the Astronomical Society of the Pacific  
Our opinion of the nature of the sixteenth magnitude faint blue "star," Tonantzintla 202, has varied considerably. Found by Iriarte and Chavira (1957), it proves to be a quasi-stellar object with a redshift 2 = 0.366. The first spectrum of the object, primefocus plate number N1103 by Greenstein on June 22/23, 1960, seems to be the first spectrum ever taken of a quasi-stellar object. He classified it as possibly that of an old nova, with weak, very broad emission and absorption lines. It is
more » ... n lines. It is listed in Eggen and Greenstein (1965) as EG 109, a white dwarf, without emission lines. In Greenstein (1966) it is noted as C(em?), with suspected broad emission, possibly a quasi-stellar galaxy. The implied range of estimated luminosity based on the classifications from DC to QSG rivals the errors of the solar luminosity in the Ptolemaic system.
doi:10.1086/128980 fatcat:cfrkf4grzffynpaltefz2npmky