HD 74772
Star in the constellation Vela
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HD 74772 (d Velorum) is a single[10] star in the southern constellation of Vela. It is positioned near the Vela SNR, which gives it an intense X-ray background.[11] The star is of apparent visual magnitude 4.05,[1] and hence is visible to the naked eye. Based upon an annual parallax shift of 15.8 mas,[2] 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.[4]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 08h 44m 23.94539s[2] |
| Declination | −42° 38′ 57.3933″[2] |
| Apparent magnitude (V) | 4.05[1] |
| Characteristics | |
| Spectral type | G6 III[3] |
| B−V color index | 0.874±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | −2.0±0.3[4] km/s |
| Proper motion (μ) | RA: −22.641[2] mas/yr Dec.: +19.137[2] mas/yr |
| Parallax (π) | 15.7791±0.3148 mas[2] |
| Distance | 207 ± 4 ly (63 ± 1 pc) |
| Absolute magnitude (MV) | −0.18[1] |
| Details | |
| Mass | 3.2[5] M☉ |
| Radius | 12[6] R☉ |
| Luminosity | 128.02[1] L☉ |
| Surface gravity (log g) | 2.50[7] cgs |
| Temperature | 5,210[7] K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotational velocity (v sin i) | 5.8[8] km/s |
| Other designations | |
| d Vel, CD−42°4569, GJ 9276, HD 74772, HIP 42884, HR 3477, SAO 220371, WDS J08444-4239A[9] | |
| Database references | |
| SIMBAD | data |
This is an evolved G-type giant star with a stellar classification of G6 III.[3] The interferometry-measured angular diameter of this star is 1.73±0.12 mas,[12] which, at its estimated distance, equates to a physical radius of about 12 times the radius of the Sun.[6] It has 3.2[5] times the mass of the Sun and is radiating 128[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,210 K.[7]
