20 Puppis
Star in the constellation Puppis
From Wikipedia, the free encyclopedia
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]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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]