20 Puppis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 08h 13m 19.96710s |
| Declination | −15° 47′ 17.6008″ |
| Apparent magnitude (V) | 4.99 |
| Characteristics | |
| Spectral type | G4 Ib-II |
| U−B color index | +0.78 |
| B−V color index | +1.07 |
| Astrometry | |
| Radial velocity (Rv) | +16.80 km/s |
| Proper motion (μ) | RA: −12.718 mas/yr Dec.: −4.270 mas/yr |
| Parallax (π) | 3.2906±0.1404 mas |
| Distance | 990 ± 40 ly (300 ± 10 pc) |
| Absolute magnitude (MV) | −2.12 |
| Details | |
| Mass | 5.2±0.2 M☉ |
| Radius | 47.60+1.55 −1.16 R☉ |
| Luminosity | 1,087.12±53.98 L☉ |
| Surface gravity (log g) | 0.80 cgs |
| Temperature | 4,804+59 −77 K |
| Metallicity [Fe/H] | −0.18 dex |
| Rotational velocity (v sin i) | 6.9 km/s |
| Age | 90 Myr |
| Other designations | |
| 20 Pup, BD−15°2324, FK5 311, GC 11184, HD 68752, HIP 40259, HR 3229, SAO 153993, GSC 05996-02764 | |
| Database references | |
| SIMBAD | data |
20 Puppis is a solitary 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. 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.
This object has a stellar classification of G4 Ib-II, matching a G-type star with a luminosity class part way between a bright giant and a supergiant star. It is just 90 million years old with around five times the mass of the Sun. The star has expanded to 48 times the Sun's radius and is radiating 1,087 times as much luminosity as the Sun from its enlarged photosphere at an effective temperature of 4,804 K.