Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 16h 18m 17.89900s[1] |
Declination | −28° 36′ 50.4721″[1] |
Apparent magnitude (V) | 4.80[2] |
Characteristics | |
Spectral type | A0 V[3] |
B−V color index | +0.008±0.018[2] |
Astrometry | |
Radial velocity (Rv) | −13.0±0.8[4] km/s |
Proper motion (μ) | RA: −31.971[1] mas/yr Dec.: −101.295[1] mas/yr |
Parallax (π) | 23.0018 ± 0.3267 mas[1] |
Distance | 142 ± 2 ly (43.5 ± 0.6 pc) |
Absolute magnitude (MV) | 1.14[5] |
Details | |
Mass | 1.49[3] or 2.13±0.02[6] M☉ |
Radius | 1.60[7] R☉ |
Luminosity | 21.46+0.53 −0.51[6] L☉ |
Surface gravity (log g) | 3.99±0.13[8] cgs |
Temperature | 9,441+109 −108[6] K |
Metallicity [Fe/H] | −0.27±0.12[8] dex |
Rotational velocity (v sin i) | 39[6] km/s |
Age | 10[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 146624 (d Scorpii) is a single,[3] white-hued star in the southern zodiac constellation of Scorpius. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.80.[2] The distance to HD 146624 can be estimated from its annual parallax shift of 23.0 mas,[1] yielding a separation of 142 light years. At that distance, the visual magnitude is reduced by an extinction of 0.17 due to interstellar dust.[5] It is a member of the Beta Pictoris moving group, a set of ~12 million year old stars that share a common motion through space.[10]
This is an A-type main-sequence star with a stellar classification of A0 V,[3] and is suspected to be chemically peculiar.[11][6] It is a young star, just 10[3] million years old, with a projected rotational velocity of 39 km/s.[6] The mass of the star is greater than the Sun's, with De Rosa et al. (2014) estimating 1.49[3] times the mass of the Sun, while Zorec and Royer (2012) gives a multiplier of 2.13±0.02.[6] It has 1.60[7] times the Sun's radius and shines with 21 times the Sun's luminosity from its photosphere at an effective temperature of 9,441 K.[6]
The star displays an infrared excess, suggesting a circumstellar disk of orbiting material. This has a mean temperature of 280 K, matching a disk radius of 4.20 AU.[7]