  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 16h 41m 20.41559s[1] |
| Declination | −48° 45′ 46.7305″[1] |
| Apparent magnitude (V) | 5.54[2] |
| Characteristics | |
| Spectral type | O3 V((f*)) - O3.5 V((f+)) + O5.5-6 V((f)) + O6.5-7 V((f))[3] |
| U−B color index | −0.76[2] |
| B−V color index | +0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | −27[4] km/s |
| Proper motion (μ) | RA: +2.514[1] mas/yr Dec.: −4.309[1] mas/yr |
| Parallax (π) | 0.6934 ± 0.0484 mas[1] |
| Distance | 4,310 ± 390 ly (1,320 ± 120 pc)[5] ly |
| Absolute magnitude (MV) | −6.47 (−5.91 + −4.90 + −4.44)[3] |
| Orbit[5] | |
| Primary | Primary |
| Companion | Secondary |
| Period (P) | 2.67454 days |
| Semi-major axis (a) | 38.2 R☉[3] |
| Eccentricity (e) | 0 |
| Inclination (i) | 53[6]° |
| Semi-amplitude (K1) (primary) | 208.3 km/s |
| Semi-amplitude (K2) (secondary) | 334.5 km/s |
| Orbit[6] | |
| Primary | Primary/Secondary |
| Companion | Tertiary |
| Period (P) | 3069 d |
| Semi-major axis (a) | 16.918" (20.9 AU[5]) |
| Eccentricity (e) | 0.6780 |
| Inclination (i) | 106.11° |
| Semi-amplitude (K1) (primary) | 22.1 km/s |
| Semi-amplitude (K2) (secondary) | 70.6 km/s |
| Details[3] | |
| Primary | |
| Mass | 54[6] M☉ |
| Radius | 12.13 R☉ |
| Luminosity | 724,000 L☉ |
| Surface gravity (log g) | 4.00 cgs |
| Temperature | 46,500 K |
| Rotational velocity (v sin i) | 171 km/s |
| Secondary | |
| Mass | 34[6] M☉ |
| Radius | 9.54 R☉ |
| Luminosity | 209,000 L☉ |
| Surface gravity (log g) | 4.00 cgs |
| Temperature | 40,000 K |
| Rotational velocity (v sin i) | 136 km/s |
| Age | 0-2 Myr |
| Tertiary | |
| Mass | 27.1[6] M☉ |
| Radius | 8.24 R☉ |
| Luminosity | 102,000 L☉ |
| Surface gravity (log g) | 3.50 cgs |
| Temperature | 36,000 K |
| Rotational velocity (v sin i) | 72 km/s |
| Age | 1-3 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 150136 is a multiple star system in the southern constellation of Ara, around 4,300 light years away. It is the brightest member of the faint open cluster NGC 6193, part of the Ara OB1 association.
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