The temperature inside a newly formed neutron star is from around 100,000,000,000 to Their masses range between 1.18 and 1.97 times that of the Sun, but most are 1.35 times that of the Sun. Neutron stars cram roughly 1.3 to 2.5 solar masses into a city-sized sphere perhaps 20 kilometers (12 miles) across. The temperature inside a newly formed neutron star is from around 100,000,000,000 to 1,000,000,000,000 kelvin.

Normal stars can have a temperature in the range of 3500 to 60,000 kelvin on its surface with the hottest being the blue supergiants. A neutron star perhaps has a mass of 1.39 to 3 solar mass.

Compute the neutron degeneracy pressure and balance the gravitational pressure with the There is no space between the neutrons so they can not move. Depends on its age. How long does it take for such a star to cool to room temperature, 300 Neutron stars have surface temperatures of 1,000,000 degrees K. Yet they are not creating energy like a normal star.
Temperature is the mesure of the kinetic energy of the particle that constitute matter. The Physics of Neutron Stars Alfred Whitehead Physics 518, Fall 2009 The Problem Describe how a white dwarf evolves into a neutron star. All inferred temperatures are redshifted (i.e., the temperature seen by an observer at infinity). Matter is packed so tightly that a sugar-cube-sized amount of material would weigh more than 1 billion tons, about the same as Mount Everest! Neutron stars are typically about 20 km (12 miles) in diameter. However, the huge number of neutrinos it emits carry away so much energy that the temperature of an isolated neutron star falls within a few years to around 1,000,000 kelvin. The term “neutron star” as generally used today refers to a star with a mass M on the order of 1.5 solar masses (M ⊙), a radius R of ∼12 km, and a central density n c as high as 5 to 10 times the nuclear equilibrium density n 0 ≅ 0.16 fm –3 of neutrons and protons found in laboratory nuclei. Neutron star, any of a class of extremely dense, compact stars thought to be composed primarily of neutrons. kilometer wide. A “newborn” neutron star would have extremely high temperature, hundreds of billions kelvin. The indicated fluxes are between 0.1 and 10 keV Alternatively, we also give the temperature obtained from the fit to the RCS model.

It has a magnetic field range between (10^4 to 10^11 Tesla), where the magnitude of Earth is (25 to 65 micro Tesla). Though a neutron star has a (1.4 to 3) solar mass but it roughly compressed to an object of 10 to 25 kilometer wide. Artist concept of a neutron star within supernova remnant Cassiopeia A. "With neutron stars, we're seeing a combination of strong gravity, powerful magnetic and electric fields, and high velocities. They are just cooling off.
Matter in a neutron star is made only of neutron packed together. Illustration credit: NASA/CXC/M.Weiss View larger image NASA's Chandra X-ray Observatory has discovered the first direct evidence for a superfluid, a bizarre, friction-free state of matter, at the core of a neutron star.