# Radiation from Neutron Star impact?

As I understand it, objects falling into an old/inactive/dead/non-pulsar neutron star would be ripped apart, form an accretion disc and eventually emit a burst of radiation as they fall onto the surface of the star.

If this happened to:

1. a comet
2. a dwarf planet
3. an ice giant

...roughly how much energy/radiation would each produce? Also, if possible, over what kind of time frame? I'm only looking for ballpark figures in all cases.

• Roughly 1 atomic bomb per kg of mass. Don't worry, they are too far away to be even visible. Note, collision is very rare, it requires a direct hit. Otherways it will go on a hyperbolic orbit and never collides the neutron star. Hopefully you will get a more detailed answer, too. – peterh Mar 18 '19 at 7:57

Back of the envelope? The energy released is about $$GM/R$$ per unit mass. For a 1.5 solar mass neutron star of radius 10 km, this amounts to $$2\times 10^{16}$$ J/kg, or approximately 2/9 of the rest mass energy of the accreted material.