Rho Ophiuchi
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Not to be confused with Rho Ophiuchi cloud complex.
| 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 |
| Semi-major 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, 5 Ophiuchi, HIP 80473 | |
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.
See also
- Ophiuchus (constellation)
- Rho Ophiuchi cloud complex
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