19 Aurigae
Star in the constellation Auriga
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19 Aurigae is a single[11] star located approximately 3,800 light years away from the Sun in the northern constellation Auriga. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.05.[3] The star is moving closer to the Earth with a heliocentric radial velocity of 4.3 km/s.[3]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 20m 00.92110s[2] |
| Declination | +33° 57′ 28.9949″[2] |
| Apparent magnitude (V) | 5.05[3] |
| Characteristics | |
| Evolutionary stage | bright giant |
| Spectral type | A5 II+[4] |
| B−V color index | 0.287±0.004[3] |
| Astrometry | |
| Radial velocity (Rv) | −4.3±0.9[3] km/s |
| Proper motion (μ) | RA: −0.264[2] mas/yr Dec.: −3.415[2] mas/yr |
| Parallax (π) | 0.8596±0.0950 mas[2] |
| Distance | approx. 3,800 ly (approx. 1,200 pc) |
| Details | |
| Mass | 7.8±0.5[5] M☉ |
| Radius | 15[6] R☉ |
| Luminosity (bolometric) | 7,057[7] L☉ |
| Surface gravity (log g) | 2.10±0.25[8] cgs |
| Temperature | 8,300±100[8] K |
| Metallicity [Fe/H] | −0.19[3] dex |
| Rotational velocity (v sin i) | 8.0[9] km/s |
| Age | 36.0±2.9[5] Myr |
| Other designations | |
| 19 Aur, NSV 1925, AAVSO 0520+34B, BD+33°1013, GC 6515, HD 34578, HIP 24879, HR 1740, SAO 57906[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved A-type bright giant star with a stellar classification of A5 II+.[4] It is a variable star of unknown type that ranges in magnitude from 5.03 down to 5.09.[1] This star is an estimated 36[5] million years old with a projected rotational velocity of 8 km/s.[9] It has 8[5] times the mass of the Sun and about 15[6] times the Sun's radius. 19 Aurigae is radiating 7,057[7] times the total luminosity of the Sun from its photosphere at an effective temperature of 8,300 K.[8]