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Nu Ophiuchi
Star in the constellation Ophiuchus / From Wikipedia, the free encyclopedia
Nu Ophiuchi (ν Oph, ν Ophiuchi) is a star in the equatorial constellation of Ophiuchus. The apparent visual magnitude is +3.3,[2] making it one of the brighter members of this constellation. Based upon parallax measurements made by the Gaia spacecraft, this star is located about 142 light-years (44 parsecs) from Earth.[1]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 17h 59m 01.59221s[1] |
Declination | −09° 46′ 25.081″[1] |
Apparent magnitude (V) | +3.332[2] |
Characteristics | |
Spectral type | K0 IIIa CN –1[3] |
U−B color index | +0.873[2] |
B−V color index | +0.999[2] |
Astrometry | |
Radial velocity (Rv) | 12.95 ± 0.41[4] km/s |
Proper motion (μ) | RA: −7.707 mas/yr[1] Dec.: −116.38 mas/yr[1] |
Parallax (π) | 22.9031 ± 0.1922 mas[1] |
Distance | 142 ± 1 ly (43.7 ± 0.4 pc) |
Absolute magnitude (MV) | –0.19[5] |
Details[6] | |
Mass | 2.98±0.11 M☉ |
Radius | 13.85±0.17 R☉ |
Luminosity | 108.2±6 L☉ |
Surface gravity (log g) | 2.1 cgs |
Temperature | 5,000±63 K |
Metallicity [Fe/H] | 0.12 dex |
Rotational velocity (v sin i) | 2.1[4] km/s |
Age | 390±50 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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