Supernova Properties

Property Type I Type II
Origin Binary system with one star a white dwarf Massive dying star
Ejected mass (solar masses) ~1 ~5
Velocity of ejected mass (km/s) 10,000 5,000
Total kinetic energy (J) 1044 1044
Visual energy (J) few x 1042 1042
Spectra No hydrogen lines Hydrogen lines
Corpse Neutron Star Neutron Star or Black hole
Frequency 1 every 60 years 1 every 40 years