![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Ophiuchus_constellation_map.svg/640px-Ophiuchus_constellation_map.svg.png&w=640&q=50)
67 Ophiuchi
Star in the constellation Ophiuchus / From Wikipedia, the free encyclopedia
67 Ophiuchi (67 Oph) is a class B5 Ib[3] (blue supergiant) star in the constellation Ophiuchus. Its apparent magnitude is 3.93[2] and it is approximately 2,000 light years away based on spectroscopy.[5] It is considered to be a member of the open cluster Collinder 359 (Melotte 186).
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 18h 00m 38.71619s[1] |
Declination | 2° 55′ 53.6324″[1] |
Apparent magnitude (V) | 3.93[2] |
Characteristics | |
Spectral type | B5Ib[3] |
U−B color index | -0.62[2] |
B−V color index | +0.03[2] |
Astrometry | |
Radial velocity (Rv) | −5.20[4] km/s |
Proper motion (μ) | RA: +1.15[1] mas/yr Dec.: -9.35[1] mas/yr |
Parallax (π) | 2.65 ± 0.54 mas[1] |
Distance | 2020±200 ly (620±60 pc)[5] |
Absolute magnitude (MV) | −3.5[6] |
Details | |
Mass | 12.6±0.4[5] M☉ |
Radius | 31±4[5] R☉ |
Luminosity | 39,800+9,200 −7,500[5] L☉ |
Surface gravity (log g) | 3.03[7] cgs |
Temperature | 14,700±300[5] K |
Metallicity [Fe/H] | -0.01[7] dex |
Rotational velocity (v sin i) | 40[8] km/s |
Age | 16.6+1.6 −1.5[5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
67 Oph has four companions. The closest is a magnitude 13.7 B1 main sequence star at 8.29", designated B. Component C (BD+02°3459) is the brightest close companion, a magnitude 8.1 B2 main sequence star at 54.32". Component D is a magnitude 12.5 star 8.37" from component C. Component E is a magnitude 10.9 star 46.53" from 67 Oph A.[9]
This star was once considered part of the obsolete constellation Taurus Poniatovii, but after the International Astronomical Union officially recognized constellations, it was placed in Ophiuchus.[10]