Brightness of neutron stars

[hamishspence]

https://en.wikipedia.org/wiki/Neutron_star



https://en.wikipedia.org/wiki/Magnetar

Those don't match, but they both say the mass is > Sol.

The Neutron Star page does raise the possibility that 3 solar masses is the maximum (as per the Magnetar page):

A neutron star has a mass of at least 1.1 and perhaps up to 3 solar masses (M☉).[15][16] The maximum observed mass of neutron stars is about 2.01 M☉. But in general, compact stars of less than 1.39 M☉ (the Chandrasekhar limit) are white dwarfs, whereas compact stars with a mass between 1.4 M☉ and 3 M☉ (the Tolman–Oppenheimer–Volkoff limit) should be neutron stars (though there is an interval of a few tenths of a solar mass where the masses of low-mass neutron stars and high-mass white dwarfs can overlap).

Also, radius 10 km is the same as Diameter 20 km - so that bit's OK.