Epoch J2000 Equinox J2000
|Apparent magnitude (V)||9.18|
|B−V color index||+0.65|
|Radial velocity (Rv)||-44.3 km/s|
|Proper motion (μ)||RA: +172.91 mas/yr
Dec.: -15.41 mas/yr
|Parallax (π)||12.84 ± 0.97 mas|
|Distance||250 ± 20 ly
(78 ± 6 pc)
|Absolute magnitude (MV)||4.72|
|Surface gravity (log g)||4.35 ± 0.023 cgs|
|Temperature||5,723 ± 547 K|
± 0.004 dex
The measured properties of this star are very similar to those of the Sun, making it a candidate solar twin. The abundances of 21 elements overall are more similar to the Sun than any other known solar twin. Additionally, the effective temperature, surface gravity, and microturbulence are nearly identical to the Sun's. However, it is significantly older than the Sun, being approximately 3.6 billion years older. The fact that the abundances are so similar to the Sun's suggests that it is a potential candidate for hosting terrestrial type planets.
- "HD 197027". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2013-09-07.
- Talawanda R. Monroe et al. (Aug 2013). "High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun". Astrophysical Journal Letters 774 (2): L32. doi:10.1088/2041-8205/774/2/l32.
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