Methods and results of measurement of reflectance and emissivity properties of spacecraft coatings and materials

In this paper are examined methods of measurement of reflectance (total solar absorptance A(s), spectral reflectance rho(lambda) and brightness beta(lambda) coefficients, indicatrix of reflection within the range of 0.2-0.9 mum wave length) and emissivity properties (thermal radiation coefficient) of spacecraft coatings and materials. Some results of measurements of reflectance and emissivity properties of spacecraft coatings and materials, such as A(s), e, rho(lambda), beta(lambda) including dependence of spectral reflectance coefficient rho(lambda) and brightness coefficient beta(lambda) on radiation incidence and reflection angles are given.