HR 6806
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 09m 37.41626s[1] |
| Declination | +38° 27′ 27.9960″[1] |
| Apparent magnitude (V) | 6.40[2] |
| Characteristics | |
| Spectral type | K2 V[3] |
| U−B color index | +0.585[2] |
| B−V color index | +0.875[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.473 ± 0.028[4] km/s |
| Proper motion (μ) | RA: −316.44[1] mas/yr Dec.: −468.47[1] mas/yr |
| Parallax (π) | 90.71 ± 0.30[1] mas |
| Distance | 36.0 ± 0.1 ly (11.02 ± 0.04 pc) |
| Details | |
| Surface gravity (log g) | 4.53[3] cgs |
| Temperature | 4,900[3] K |
| Metallicity [Fe/H] | −0.61[3] dex |
| Rotation | 42 d[5] |
| Rotational velocity (v sin i) | 4.82[6] km/s |
| Age | 5.8–7.1[7] Gyr |
| Other designations | |
HR 6806 is a solitary, orange, main sequence (K2 V) star located thirty-six light-years away, in the constellation Hercules. It appears to be rotating slowly with an estimated period of 42 days. The star has an inactive chromosphere, with a surface magnetic field strength of 1,500 G.[5]
There is a nearby brown dwarf, WISE J180901.07+383805.4, at an angular separation of 769″, which would correspond to a projected separation of 8460 AU at the distance of HR 6806. However, this is most likely a typical T7 dwarf, which would place it at a distance of 91 ly (28 pc)—ruling out a physical association. This is confirmed by the differing proper motion of the star and this object.[9]
References
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