HD 131399
HD 131399 is a star system in the constellation of Centaurus. Based on the system's electromagnetic spectrum, it is located around 350 light-years (107.9 parsecs) away. The total apparent magnitude is 7.07, but because of interstellar dust between it and the Earth, it appears 0.22 ± 0.09 magnitudes dimmer than it should be.
SPHERE image of HD 131399 A (top left), B and C (bottom right), and the background object (center) Credit: ESO/K. Wagner et al. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 14h 54m 25.30919s |
| Declination | −34° 08′ 34.0412″ |
| Apparent magnitude (V) | 7.07 |
| Characteristics | |
| Spectral type | A1V + G + K |
| Astrometry | |
| Radial velocity (Rv) | 0.30 ± 1.3 km/s |
| Distance | 351+15 −12 ly (107.9+4.5 −3.7 pc) |
| A | |
| Proper motion (μ) | RA: −30.702 mas/yr Dec.: −30.774 mas/yr |
| Parallax (π) | 9.7480 ± 0.0357 mas |
| Distance | 335 ± 1 ly (102.6 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.89 |
| BC | |
| Proper motion (μ) | RA: −31.523 mas/yr Dec.: −31.047 mas/yr |
| Parallax (π) | 9.3021 ± 0.0633 mas |
| Distance | 351 ± 2 ly (107.5 ± 0.7 pc) |
| Orbit | |
| Primary | A |
| Companion | BC |
| Period (P) | 3556 ± 36 yr |
| Semi-major axis (a) | 3.56 ± 0.03″ (349 ± 28 au) |
| Eccentricity (e) | 0.13 ± 0.05 |
| Inclination (i) | 45 to 65° |
| Longitude of the node (Ω) | 265 ± 20° |
| Periastron epoch (T) | B 502 ± 33 |
| Argument of periastron (ω) (secondary) | 145.3 ± 15° |
| Details | |
| Age | 21.9+4.1 −3.8 Myr |
| HD 131399 A | |
| Mass | 1.95+0.08 −0.06 M☉ |
| Radius | 1.51+0.13 −0.10 R☉ |
| Luminosity | 14.8+2.6 −2.2 L☉ |
| Surface gravity (log g) | 4.37±0.10 cgs |
| Temperature | 9,200±100 K |
| Rotational velocity (v sin i) | 26±2 km/s |
| HD 131399 B | |
| Mass | 0.95±0.04 M☉ |
| Surface gravity (log g) | 4.40±0.03 cgs |
| Temperature | 4,890+190 −170 K |
| HD 131399 C | |
| Mass | 0.35±0.04 M☉ |
| Surface gravity (log g) | 4.45±0.05 cgs |
| Temperature | 3,460±60 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The brightest star, is a young A-type main-sequence star, and further out are two lower-mass stars. A Jupiter-mass planet or a low-mass brown dwarf was once thought to be orbiting the central star, but this has been ruled out.
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