Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vela |
Right ascension | 08h 44m 23.94539s[1] |
Declination | −42° 38′ 57.3933″[1] |
Apparent magnitude (V) | 4.05[2] |
Characteristics | |
Spectral type | G6 III[3] |
B−V color index | 0.874±0.002[2] |
Astrometry | |
Radial velocity (Rv) | −2.0±0.3[4] km/s |
Proper motion (μ) | RA: −22.641[1] mas/yr Dec.: +19.137[1] mas/yr |
Parallax (π) | 15.7791 ± 0.3148 mas[1] |
Distance | 207 ± 4 ly (63 ± 1 pc) |
Absolute magnitude (MV) | −0.18[2] |
Details | |
Mass | 3.2[5] M☉ |
Radius | 12[6] R☉ |
Luminosity | 128.02[2] 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 | |
Database references | |
SIMBAD | data |
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,[2] and hence is visible to the naked eye. Based upon an annual parallax shift of 15.8 mas,[1] 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]
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[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,210 K.[7]