HD 162826
Star in the constellation of Hercules / From Wikipedia, the free encyclopedia
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HD 162826 (HR 6669, HIP 87382)[14] is a star in the constellation Hercules. It is about 110 light-years (34 parsecs) away from Earth.[1] With an apparent magnitude of 6.55,[2] the star can be found with binoculars or a low-power telescope by reference to nearby Vega in the constellation Lyra.[15]
Location of HD 162826 in the constellation Hercules | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 17h 51m 14.02244s[1] |
Declination | +40° 04′ 20.8772″[1] |
Apparent magnitude (V) | 6.55±0.01[2] |
Characteristics | |
Spectral type | F8 V[3][4] |
U−B color index | +0.04[2] |
B−V color index | +0.52[2] |
Astrometry | |
Radial velocity (Rv) | 1.9±0.1[5] km/s |
Proper motion (μ) | RA: −16.864 mas/yr[1] Dec.: +9.833 mas/yr[1] |
Parallax (π) | 30.068 ± 0.0646 mas[1] |
Distance | 108.5 ± 0.2 ly (33.26 ± 0.07 pc) |
Absolute magnitude (MV) | +3.92[6] |
Details | |
Mass | 1.17[7] M☉ |
Radius | 1.32±0.04[8] R☉ |
Luminosity | 2.27[9] L☉ |
Surface gravity (log g) | 4.28+0.02 −0.03[8] cgs |
Temperature | 6,158±9[10] K |
Metallicity [Fe/H] | +0.02±0.04[11] dex |
Rotational velocity (v sin i) | 5[12][13] km/s |
Age | 3.88[7] 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.[16] Solar siblings are those stars that formed from the same gas cloud and in the same star cluster; the term was introduced in 2009.[17][18] 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.[19]
In November 2018, a second potential solar twin was announced, HD 186302, an 8th magnitude star in the Pavo constellation.[20]