Nu Ophiuchi
Nu Ophiuchi (ν Oph, ν Ophiuchi) is a star in the equatorial constellation of Ophiuchus. The apparent visual magnitude is +3.3, making it one of the brighter members of this constellation. Based upon parallax measurements made during the Hipparcos mission, this star is located about 151 light-years (46 parsecs) from Earth.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 59m 01.59191s |
| Declination | −09° 46′ 25.0798″ |
| Apparent magnitude (V) | +3.332 |
| Characteristics | |
| Spectral type | K0 IIIa CN –1 |
| U−B color index | +0.873 |
| B−V color index | +0.999 |
| Astrometry | |
| Radial velocity (Rv) | 12.95 ± 0.41 km/s |
| Proper motion (μ) | RA: –9.48 mas/yr Dec.: –116.69 mas/yr |
| Parallax (π) | 21.64 ± 0.26 mas |
| Distance | 151 ± 2 ly (46.2 ± 0.6 pc) |
| Absolute magnitude (MV) | –0.19 |
| Details | |
| Mass | 3.04 M☉ |
| Radius | 14 R☉ |
| Luminosity | 123 L☉ |
| Surface gravity (log g) | 2.7 cgs |
| Temperature | 4,928 K |
| Metallicity [Fe/H] | 0.02 dex |
| Rotational velocity (v sin i) | 2.1 km/s |
| Age | 330 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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