  The binary star NY Hya is a bright, detached, double-lined eclipsing system
with an orbital period of just under five days with two components each nearly
identical to the Sun and located in the solar neighbourhood.
  The objective of this study is to test and confront various stellar evolution
models for solar-type stars based on accurate measurements of stellar mass and
radius.
  We present new ground-based spectroscopic and photometric as well as
high-precision space-based photometric and astrometric data from which we
derive orbital as well as physical properties of the components via the method
of least-squares minimisation based on a standard binary model valid for two
detached components. Classic statistical techniques were invoked to test the
significance of model parameters. Additional empirical evidence was compiled
from the public domain; the derived system properties were compared with
archival broad-band photometry data enabling a measurement of the system's
spectral energy distribution that allowed an independent estimate of stellar
properties. We also utilised semi-empirical calibration methods to derive
atmospheric properties from Str\"{o}mgren photometry and related colour
indices. Data was used to confront the observed physical properties with
classic and magnetic stellar evolution models.
