RS Puppis is a Cepheid variable star around 6,000 ly away in the constellation of Puppis. It is one of the biggest and brightest known Cepheids in the Milky Way galaxy and has one of the longest periods for this class of star at 41.5 days.

Surface temperature: 5,143 K

Distance to Earth: 5,577 light years

Mass: 1.989 × 10^31 kg (10 M☉)

Radial velocity (R_v): 24.60 km/s

Absolute magnitude (M_V): -5.70

B−V color index: 1.5