HD 74180
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 40m 37.57121s |
| Declination | −46° 38′ 55.4644″ |
| Apparent magnitude (V) | 3.81 |
| Characteristics | |
| Evolutionary stage | Yellow supergiant or yellow hypergiant |
| Spectral type | F0Ia or F0Ia+ |
| U−B color index | +0.34 |
| B−V color index | +0.67 |
| Variable type | suspected α Cyg |
| Astrometry | |
| Radial velocity (Rv) | −25.3 km/s |
| Proper motion (μ) | RA: −6.124 mas/yr Dec.: +4.473 mas/yr |
| Parallax (π) | 0.431±0.101 mas |
| Distance | 5,400+110 −140 ly (1,657+33 −44 pc) |
| Absolute magnitude (MV) | −6.50 |
| Details | |
| Mass | 21.4±2.3 M☉ |
| Radius | 325±28 R☉ |
| Luminosity | 316,000+73,000 −65,000 L☉ |
| Surface gravity (log g) | 1.38 cgs |
| Temperature | 7,839 K |
| Metallicity [Fe/H] | +0.56 dex |
| Rotational velocity (v sin i) | 21.7±6 km/s |
| Age | 7.4±0.8 Myr |
| Other designations | |
| b Velorum, HR 3445, HD 74180, CD−46°4438, FK5 1226, HIP 42570, SAO 220265 | |
| Database references | |
| SIMBAD | data |
HD 74180 (b Velorum) is a single star in the constellation Vela. It is a yellow-white F-type supergiant with a mean apparent magnitude of +3.81 and a spectral classification F8Ib.