The light curve of SN 1572 is described in the terms used nowadays to characterize SNeIa .
By assembling the records of the observations done in 1572–74 and evaluating their uncertainties , it is possible to recover the light curve and the color evolution of this supernova .
It is found that , within the SNe Ia family , the event should have been a SNIa with a normal rate of decline , its stretch factor being s \sim 0.9 .
Visual light curve near maximum , late–time decline and the color evolution sustain this conclusion .
After correcting for extinction , the luminosity of this supernova is found to be M _ { V } = –19.58 –5 log ( D/3.5 kpc ) \pm 0.42 .