Theta Reticuli

Theta Reticuli is double star in southern constellation of Reticulum, located just $3$ south of Alpha Reticuli. The pair are visible to the naked eye as a dim, white-hued point of light with a combined apparent visual magnitude of 5.88. They lie at roughly the same distance from the Sun based on parallax, with the primary being around 466 light-years away. They also share a similar proper motion, suggesting they may be gravitationally bound.

The magnitude 6.05 primary, designated component A, has a stellar classification of B9IV, matching a B-type subgiant. It is 166 million years old with 3.4 times the mass of the Sun. The star is radiating 179 times the Sun's luminosity from its photosphere at an effective temperature of $3.363$.

As of 2015, the magnitude 7.65 secondary, component B, had an angular separation of $50 arcminute$ from the primary along a position angle of 3°. It is most likely a very young main-sequence star, and is an Am star with a stellar classification of kA2hA5VmA7. This notation indicates the spectrum displays the K-line of an A2-type star, the hydrogen lines of a cooler A5 star, and the metal lines of an A7 star. This system is a source of X-ray emission, which may be coming from the companion.