Rho Ophiuchi
Rho Ophiuchi (ρ Ophiuchi) is a multiple star system in the constellation Ophiuchus. The central system has an apparent magnitude of 4.63. Based on the central system's parallax of 9.03 mas, it is located about 360 light-years (110 parsecs) away. The other stars in the system are slightly farther away.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 25m 35.11766s |
| Declination | −23° 26′ 49.8150″ |
| Apparent magnitude (V) | 4.63 |
| Characteristics | |
| ρ Oph AB | |
| Spectral type | B2/3V + B2V |
| U−B color index | -0.56 |
| B−V color index | +0.24 |
| Astrometry | |
| ρ Oph AB | |
| Radial velocity (Rv) | -11.40 ± 3 km/s |
| Proper motion (μ) | RA: -5.53 mas/yr Dec.: -21.74 mas/yr |
| Parallax (π) | 9.03 ± 0.90 mas |
| Distance | 360 ± 40 ly (110 ± 10 pc) |
| Absolute magnitude (MV) | -2.5 ± 0.3 |
| Orbit | |
| Primary | ρ Oph A |
| Companion | ρ Oph B |
| Period (P) | 2398 ± 326 yr |
| Semi-major axis (a) | 4.25 ± 0.79″ |
| Eccentricity (e) | 0.675 ± 0.322 |
| Inclination (i) | 135.3 ± 6.0° |
| Longitude of the node (Ω) | 77.5 ± 13.5° |
| Periastron epoch (T) | B 2327 ± 343 |
| Argument of periastron (ω) (secondary) | 226.1 ± 15.3° |
| Orbit | |
| Primary | ρ Oph D |
| Companion | ρ Oph E |
| Period (P) | 675.5 ± 32.5 yr |
| Semi-major axis (a) | 1.01 ± 0.15″ |
| Eccentricity (e) | 0.707 ± 0.112 |
| Inclination (i) | 134.8 ± 2.7° |
| Longitude of the node (Ω) | 152.7 ± 4.6° |
| Periastron epoch (T) | B 2008.6 ± 34.2 |
| Argument of periastron (ω) (secondary) | 260.4 ± 1.1° |
| Details | |
| ρ Oph A | |
| Mass | 9.6 M☉ |
| Radius | 8.5 ± 1 R☉ |
| Luminosity | 13000 L☉ |
| Temperature | 21900 K |
| Rotation | 1.205 d |
| Rotational velocity (v sin i) | 240 ± 10 km/s |
| ρ Oph B | |
| Mass | 8 M☉ |
| ρ Oph C | |
| Mass | 5 M☉ |
| ρ Oph D | |
| Mass | 3.06 M☉ |
| ρ Oph E | |
| Mass | 1.97 M☉ |
| Other designations | |
| ρ Oph AB: CD−23°12861, HIP 80473 | |
| ρ Oph A: HD 147933, HR 6112, SAO 184382 | |
| ρ Oph B: HD 147934, HR 6113, SAO 184381 | |
| ρ Oph C: CD−23°12862, HIP 80474, SAO 184383 | |
| Database references | |
| SIMBAD | ρ Oph |
| ρ Oph A | |
| ρ Oph B | |
| ρ Oph C | |
| ρ Oph D/E | |
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