HD 136164
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus[1] |
| Right ascension | 15h 20m 13.3930s[2] |
| Declination | −34° 55′ 31.574″[2] |
| Apparent magnitude (V) | +7.76±0.01[3] |
| Characteristics | |
| Spectral type | A2V (A)[4] M6-L2 (Ab)[5] |
| B−V color index | 0.175±0.015[1] |
| Astrometry | |
| Proper motion (μ) | RA: −22.631 mas/yr[2] Dec.: −25.861 mas/yr[2] |
| Parallax (π) | 8.2024±0.0401 mas[2] |
| Distance | 398 ± 2 ly (121.9 ± 0.6 pc) |
| Absolute magnitude (MV) | +2.05[1] |
| Position (relative to A)[5] | |
| Component | B |
| Angular distance | 5.159±0.003″ |
| Position angle | 33.0±0.2° |
| Projected separation | 650 AU |
| Orbit[6] | |
| Primary | A |
| Companion | Ab |
| Period (P) | 130[5] yr |
| Semi-major axis (a) | 22.48+1.15 −1.03 au |
| Eccentricity (e) | 0.44±0.03 |
| Inclination (i) | 11.5+4.6 −5.2° |
| Longitude of the node (Ω) | 75+27 −25° |
| Periastron epoch (T) | 2023.67+0.36 −0.21 |
| Argument of periastron (ω) (secondary) | 128+25 −30° |
| Details | |
| A | |
| Mass | 1.87±0.07[6] M☉ |
| Radius | 1.66+0.13 −0.15[7] R☉ |
| Luminosity | 12.65[1] L☉ |
| Surface gravity (log g) | 4.2[6] cgs |
| Temperature | 8,100[6] K |
| Metallicity [Fe/H] | −0.07+0.11 −0.13[7] dex |
| Age | 16±2[6] Myr |
| Ab | |
| Mass | 35±10[6] MJup |
| Radius | 1.9[6] RJup |
| Luminosity | 2.09+0.42 −0.23×10−3[6] L☉ |
| Surface gravity (log g) | 4.35[6] cgs |
| Temperature | 2,640[6] K |
| Metallicity [Fe/H] | +0.39[6] dex |
| Age | 16±2[6] Myr |
| B | |
| Mass | 0.30[8] M☉ |
| Age | 16±2[6] Myr |
| Other designations | |
| CD−34°10322, HD 136164, HIP 75056, TYC 7321-201-1[9] | |
| Database references | |
| SIMBAD | data |
HD 136164, also known as HIP 75056, is a binary star system in the constellation Lupus. At an apparent magnitude of +7.76, it is far too faint to be visible to the naked eye. Parallax measurements give a distance of 398 light-years (121.9 parsecs). The primary is orbited by a brown dwarf.
