Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 54m 25.30919s[1] |
Declination | −34° 08′ 34.0412″[1] |
Apparent magnitude (V) | 7.07[2] |
Characteristics | |
Spectral type | A1V + G + K[3] |
Astrometry | |
Radial velocity (Rv) | 0.30 ± 1.3[4] km/s |
Distance | 351+15 −12 ly (107.9+4.5 −3.7[5] pc) |
A | |
Proper motion (μ) | RA: −30.702[6] mas/yr Dec.: −30.774[6] mas/yr |
Parallax (π) | 9.7480 ± 0.0357 mas[6] |
Distance | 335 ± 1 ly (102.6 ± 0.4 pc) |
Absolute magnitude (MV) | 1.89[7] |
BC | |
Proper motion (μ) | RA: −31.523[8] mas/yr Dec.: −31.047[8] mas/yr |
Parallax (π) | 9.3021 ± 0.0633 mas[8] |
Distance | 351 ± 2 ly (107.5 ± 0.7 pc) |
Orbit[3] | |
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[note 1]° |
Periastron epoch (T) | B 502 ± 33 |
Argument of periastron (ω) (secondary) | 145.3 ± 15[note 2]° |
Details | |
Age | 21.9+4.1 −3.8[5] Myr |
HD 131399 A | |
Mass | 1.95+0.08 −0.06[7] M☉ |
Radius | 1.51+0.13 −0.10[7] R☉ |
Luminosity | 14.8+2.6 −2.2[7] L☉ |
Surface gravity (log g) | 4.37±0.10[7] cgs |
Temperature | 9,200±100[7] K |
Rotational velocity (v sin i) | 26±2[7] km/s |
HD 131399 B | |
Mass | 0.95±0.04[5] M☉ |
Surface gravity (log g) | 4.40±0.03[5] cgs |
Temperature | 4,890+190 −170[5] K |
HD 131399 C | |
Mass | 0.35±0.04[5] M☉ |
Surface gravity (log g) | 4.45±0.05[5] cgs |
Temperature | 3,460±60[5] K |
Other designations | |
Database references | |
SIMBAD | data |
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.[5] The total apparent magnitude is 7.07,[5] but because of interstellar dust between it and the Earth, it appears 0.22 ± 0.09 magnitudes dimmer than it should be.[5]
The brightest star, is a young A-type main-sequence star, and further out are two lower-mass stars.[3] 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.[5][9]
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