| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 25m 35.1176s |
| Declination | -23° 26′ 49.843″ |
| Apparent magnitude (V) | 4.63 |
| Characteristics | |
| Spectral type | B2IV/B2V |
| Apparent magnitude (B) | 4.85 |
| Apparent magnitude (U) | 4.30 |
| U−B color index | -0.55 |
| B−V color index | +0.23 |
| Variable type | ?? |
| Astrometry | |
| Proper motion (μ) | RA: -5.61 mas/yr Dec.: -25.04 mas/yr |
| Parallax (π) | 8.27 ± 1.18 mas |
| Distance | 394 ly (120 pc) |
| Absolute magnitude (MV) | -0.76 |
| Orbit | |
| Period (P) | 2,000 yr |
| Semimajor axis (a) | >400 AU |
| Details | |
| Mass | 9 / 8 M☉ |
| Luminosity | 4,900 / 2,100 L☉ |
| Temperature | 27,200 K |
| Rotation | +300 |
| Other designations | |
Rho Ophiuchi (ρ Ophiuchi) is a binary star system in the constellation Ophiuchus. It consists of a blue subgiant and a blue dwarf, both of which are of class B. Due to its location in the vicinity of the Rho Ophiuchi cloud complex, its magnitude has been dimmed down by 2 magnitudes. The star is located about 390 to 400 light years away.