Phillips relationship

[1][2][3] They found that the faster the supernova faded from maximum light, the fainter its peak magnitude was.

Moreover, the probability of discovering SNe before they reached maximum light and following their brightness evolution longer also increased.

The first light curves of SNe Ia obtained using CCD photometry showed that some supernovae had faster decline rates than others.

All this motivated the American astronomer Mark M. Phillips to revise this relationship precisely during the course of the Calán/Tololo Supernova Survey.

The lead sentence of the acknowledgments section of Phillips' paper states: "I am indebted to George Jacoby for suggesting the

It has been recast to include the evolution in multiple photometric bandpasses, with a significantly shallower slope[7][8] and as a stretch in the time axis relative to a standard template.

[9] The relation is typically used to bring any Type Ia supernova peak magnitude to a standard candle value.