HD 91324
Star in the constellation Vela
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HD 91324 is a likely binary[4] star system in the southern constellation of Vela. It is visible to the naked eye with an apparent visual magnitude of 4.89.[2] The distance to HD 91324, as determined from its annual parallax shift of 45.6 mas,[1] is 71.5 light years. It is moving further from the Earth with a heliocentric radial velocity of +21 km/s.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 10h 31m 21.82130s[1] |
| Declination | −53° 42′ 55.7373″[1] |
| Apparent magnitude (V) | 4.89[2] |
| Characteristics | |
| Spectral type | F9V Fe-0.8 CH-0.7[3] |
| B−V color index | 0.500±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | +21.37±0.20[1] km/s |
| Proper motion (μ) | RA: −420.131[1] mas/yr Dec.: +209.450[1] mas/yr |
| Parallax (π) | 45.6124±0.1682 mas[1] |
| Distance | 71.5 ± 0.3 ly (21.92 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.20[2] |
| Details[4] | |
| HD 91324 A | |
| Mass | 1.18 M☉ |
| Radius | 1.86±0.06 R☉ |
| Luminosity | 4.55[2] L☉ |
| Surface gravity (log g) | 3.97±0.10 cgs |
| Temperature | 6,127±70 K |
| Metallicity [Fe/H] | −0.27±0.06 dex |
| Rotational velocity (v sin i) | 8.8±0.6 km/s |
| Age | 3.52±1.08[5] Gyr |
| Other designations | |
| CD−53°3569, GJ 397.2, GJ 9332, HD 91324, HIP 51523, HR 4134, SAO 238146[6] | |
| Database references | |
| SIMBAD | data |
The primary, component A, is a metal-deficient[7] F-type main-sequence star with a stellar classification of F9V Fe-0.8 CH-0.7,[3] where the suffix notation indicates underabundances of iron and methine in its spectrum. It is around 3.5[5] billion years old and is spinning with a projected rotational velocity of 9 km/s. The star has 1.18 times the mass of the Sun and 1.86 times the Sun's radius.[4] It is radiating 4.55[2] times the Sun's luminosity from its photosphere at an effective temperature of 6,127 K.[4]
A faint star designated 2MASS J10313234–5338010[8] was found to be a possible companion to HD 91324 through a proper motion study combining data from the Two Micron All-Sky Survey and the WISE space telescope. The projected separation of the two components is 309″, or 6,700 AU. Proper motion measurements for the two stars are almost identical making HD 91324 a likely binary star system. The photometry of 2MASS J10313234–5338010 is consistent with it being a red dwarf of spectral type M5 or M6.[9]