λ Horologii, Latinised as Lambda Horologii, is a star in the southern constellation of Horologium. It is a yellow-white hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.35. Based upon parallax, this object is located 155 light years distance from the Sun. It is drifting further away with a radial velocity of 28 km/s. Although Eggleton and Tokovinin (2008) list this as a single star, according to Kunzli and North (1998) it may be a binary system with a long orbital period.
The visible component has a stellar classification of F2III, matching an evolved star that has, at the age of 1.4 billion years, become a giant. However, it has just 2.74 times the Sun's radius and shows a high rate of spin with a projected rotational velocity of 140 km/s. The star has 1.76 times the mass of the Sun and is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 6,848 K.
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