HD 74772
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 44m 23.94539s |
| Declination | −42° 38′ 57.3933″ |
| Apparent magnitude (V) | 4.05 |
| Characteristics | |
| Spectral type | G6 III |
| B−V color index | 0.874±0.002 |
| Astrometry | |
| Radial velocity (Rv) | −2.0±0.3 km/s |
| Proper motion (μ) | RA: −22.641 mas/yr Dec.: +19.137 mas/yr |
| Parallax (π) | 15.7791±0.3148 mas |
| Distance | 207 ± 4 ly (63 ± 1 pc) |
| Absolute magnitude (MV) | −0.18 |
| Details | |
| Mass | 3.2 M☉ |
| Radius | 12 R☉ |
| Luminosity | 128.02 L☉ |
| Surface gravity (log g) | 2.50 cgs |
| Temperature | 5,210 K |
| Metallicity [Fe/H] | −0.03 dex |
| Rotational velocity (v sin i) | 5.8 km/s |
| Other designations | |
| d Vel, CD−42°4569, GJ 9276, HD 74772, HIP 42884, HR 3477, SAO 220371, WDS J08444-4239A | |
| Database references | |
| SIMBAD | data |
HD 74772 (d Velorum) is a single star in the southern constellation of Vela. It is positioned near the Vela SNR, which gives it an intense X-ray background. The star is of apparent visual magnitude 4.05, and hence is visible to the naked eye. Based upon an annual parallax shift of 15.8 mas, it is located 207 light years from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.
This is an evolved G-type giant star with a stellar classification of G6 III. The interferometry-measured angular diameter of this star is 1.73±0.12 mas, which, at its estimated distance, equates to a physical radius of about 12 times the radius of the Sun. It has 3.2 times the mass of the Sun and is radiating 128 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,210 K.