HD 162826
HD 162826 (HR 6669, HIP 87382) is a star in the constellation Hercules. It is about 110 light-years (34 parsecs) away from Earth. With an apparent magnitude of 6.55, the star can be found with binoculars or a low-power telescope by reference to nearby Vega in the constellation Lyra.
HD 162826 Location of HD 162826 in the constellation Hercules | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 51m 14.02244s |
| Declination | +40° 04′ 20.8772″ |
| Apparent magnitude (V) | 6.55±0.01 |
| Characteristics | |
| Spectral type | F8 V |
| U−B color index | +0.04 |
| B−V color index | +0.52 |
| Astrometry | |
| Radial velocity (Rv) | 1.9±0.1 km/s |
| Proper motion (μ) | RA: −16.864 mas/yr Dec.: +9.833 mas/yr |
| Parallax (π) | 30.068 ± 0.0646 mas |
| Distance | 108.5 ± 0.2 ly (33.26 ± 0.07 pc) |
| Absolute magnitude (MV) | +3.92 |
| Details | |
| Mass | 1.17 M☉ |
| Radius | 1.32±0.04 R☉ |
| Luminosity | 2.27 L☉ |
| Surface gravity (log g) | 4.28+0.02 −0.03 cgs |
| Temperature | 6,158±9 K |
| Metallicity [Fe/H] | +0.02±0.04 dex |
| Rotational velocity (v sin i) | 5 km/s |
| Age | 3.88 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star is considered to be a stellar sibling of the Sun and is the first such sibling to be discovered. Solar siblings are those stars that formed from the same gas cloud and in the same star cluster; the term was introduced in 2009. No planets have been detected orbiting HD 162826, but due to its metallicity, it is likely to harbor terrestrial planets; the star's spectra had been under observation previously.
In November 2018, a second potential solar twin was announced, HD 186302, an 8th magnitude star in the Pavo constellation.