HD 74772

This article is about d Velorum and is not to be confused with δ Velorum.

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]

HD 74772

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]