47 Ophiuchi
| Observation data J2000
| ||
|---|---|---|
| Constellation | Serpens | |
| Right ascension | 17h 26m 37.88094s[1] | |
| Declination | −05° 05′ 11.7500″[1] | |
| Apparent magnitude (V) | 4.54[2] (4.93 / 5.83)[3] | |
| Characteristics | ||
| Spectral type | F3V[4] | |
| U−B color index | -0.03[5] | |
| B−V color index | +0.39[5] | |
Semi-amplitude (K1)(primary) | 46.92 ± 0.40 km/s | |
| Semi-amplitude (K2) (secondary) | 52.80 ± 0.39 km/s | |
| Details[3] | ||
| 47 Oph A | ||
| Mass | 1.50 ± 0.06 M☉ | |
| Radius | 2.06 ± 0.07 R☉ | |
| Luminosity | 7.80 ± 0.36 L☉ | |
| 47 Oph B | ||
| Mass | 1.34 ± 0.06 M☉ | |
| Radius | 1.36 ± 0.06 R☉ | |
| Luminosity | 3.41 ± 0.25 L☉ | |
HR 6493, SAO 141665 | ||
| Database references | ||
| SIMBAD | data | |
47 Ophiuchi (47 Oph) is a binary star in the constellation Serpens. The combined apparent magnitude of the system is 4.54.[2] The system is located about 98.1 light-years, or 30.1 parsecs away, based on its parallax as measured by Hipparcos.[1]
47 Ophiuchi is a
Doppler shifts in the stars' spectra can be detected. In this case, the two stars have also been resolved using interferometry.[3] The primary star is an F-type main-sequence star,[4] that is 1.5 times the mass of the Sun and around twice as wide.[3] Its companion star is 1.34 times the mass of the Sun, and 1.36 times the radius of the Sun.[3] The two stars orbit each other every 26.3 days, and its orbital eccentricity is 0.481.[3]
The designation 47 Ophiuchi was originally used for the star HR 6496.Serpens, and the designation became used for this star, HR 6493, instead.[7]
References
- ^ S2CID 18759600.
- ^ Bibcode:2002yCat.2237....0D.
- ^ S2CID 54767546.
- ^ S2CID 122811461.
- ^ Bibcode:1986EgUBV........0M.
- S2CID 118445625.
- Bibcode:1995yCat.5050....0H.
| Stars |
| ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Star clusters |
| ||||||||||||
| Nebulae |
| ||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
| |||||||||||||
