R Horologii is a red supergiant star in the constellation Horologium. It is a Mira-type variable star with a magnitude of 4.7 to 14.3, one of the largest ranges of brightness for any star. It is located only 756 light years away, one of the closest large supergiants. R Horologii shares some traits with Antares and Betelgeuse, two other large supergiant stars, with R Horologii being the smallest, dimmest and coolest of the three.
Astronomical data
Radius (in Solar Radii): 630 R☉
Diameter (in Kilometers): 876,960,000 km
Mass (in Solar Masses): 0.89 M☉
Distance (in Light Years): 756 ly
Spectral type: M5-7e (Red)
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