20 Puppis

20 Puppis is a solitary^[10] star in the southern constellation of Puppis. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.99.^[2] The star lies approximately 990 light years away from the Sun based on parallax. It is receding from the Earth with a heliocentric radial velocity of +16.8 km/s.^[4]

20 Puppis

Location of 20 Puppis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Puppis
Right ascension	08h 13m 19.96710s[1]
Declination	−15° 47′ 17.6008″[1]
Apparent magnitude (V)	4.99[2]
Characteristics
Spectral type	G4 Ib-II[3]
U−B color index	+0.78[2]
B−V color index	+1.07[2]
Astrometry
Radial velocity (Rv)	+16.80[4] km/s
Proper motion (μ)	RA: −12.718[1] mas/yr Dec.: −4.270[1] mas/yr
Parallax (π)	3.2906±0.1404 mas[1]
Distance	990 ± 40 ly (300 ± 10 pc)
Absolute magnitude (MV)	−2.12[5]
Details
Mass	5.2±0.2[6] M☉
Radius	47.60+1.55 −1.16[1] R☉
Luminosity	1,087.12±53.98[1] L☉
Surface gravity (log g)	0.80[7] cgs
Temperature	4,804+59 −77[1] K
Metallicity [Fe/H]	−0.18[5] dex
Rotational velocity (v sin i)	6.9[8] km/s
Age	90[6] Myr
Other designations
20 Pup, BD−15°2324, FK5 311, GC 11184, HD 68752, HIP 40259, HR 3229, SAO 153993, GSC 05996-02764[9]
Database references
SIMBAD	data

This object has a stellar classification of G4 Ib-II,^[3] matching a G-type star with a luminosity class part way between a bright giant and a supergiant star. It is just 90^[6] million years old with around five^[6] times the mass of the Sun. The star has expanded to 48^[1] times the Sun's radius and is radiating 1,087^[1] times as much luminosity as the Sun from its enlarged photosphere at an effective temperature of 4,804 K.^[1]