WASP-45 is a K-type main-sequence star about 701 light-years (215 parsecs) away. The star's age cannot be well constrained, but it is probably older than the Sun. Yet WASP-45 is enriched in heavy elements compared to the Sun, having 240% of the solar abundance. WASP-45 has low ultraviolet emission, therefore it is suspected to have a low starspot activity, although chromospheric activity was reported elsewhere. There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU. The companion is estimated to have a mass of 0.157 M☉ and a temperature of 3,154 K. Although it shares a similar distance and common proper motion with the primary star, its relative space velocity appears to be high enough that the pair are not gravitationally bound.
Planetary system In 2011 a transiting hot Jupiter planet, WASP-45b, was detected. The planet equilibrium temperature is 1,170±24 K. No Rayleigh scattering was detected in the planetary atmosphere, implying the existence of hazes or a high cloud deck.
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