RS Puppis

RS Puppis

RS Puppis as imaged by Hubble
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 08h 13m 04.21601s[1]
Declination −34° 34′ 42.7023″[1]
Apparent magnitude (V) 6.5-7.6[2]
Characteristics
Spectral type G2Ib[3] (F9 - G7[4])
U−B color index 1.2[5]
B−V color index 1.5[5]
Variable type δ Cep[4]
Astrometry
Radial velocity (Rv)24.60[6] km/s
Proper motion (μ) RA: -3.19[1] mas/yr
Dec.: 2.33[1] mas/yr
Parallax (π)0.5844 ± 0.0260 mas[7]
Distance5,600 ± 200 ly
(1,710 ± 80 pc)
Absolute magnitude (MV)-5.70[8]
Details
Mass9.2[8] M☉
Radius191[9] (164 - 208) R☉
Luminosity21,700[9] (14,200 - 29,500) L☉
Temperature5,060[9] (4,640 - 5,850) K
Metallicity [Fe/H]0.17[10] dex
Age28[10] Myr
Other designations
HD 68860, HIP 40233, SAO 198944, CD−34°4488
Database references
SIMBADdata

RS Puppis (or RS Pup) 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.

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