HD 197027

HD 197027

250px HIP 102152 Credit: ESO/Digitized Sky Survey 2
Observation data Epoch J2000      Equinox J2000
Constellation	Capricornus
Right ascension	20:41:45.632h
Declination	−27:12:57.414°
Apparent magnitude (V)	9.18
Characteristics
Spectral type	G3V
B−V color index	+0.65
Astrometry
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
Details
Mass	0.97 M☉
Surface gravity (log g)	4.35 ± 0.023 cgs
Temperature	5,723 ± 547 K
Metallicity [Fe/H]	-0.013  ± 0.004 dex
Age	8.2 Gyr
Other designations
HIP 102152 PPM 271498 SAO 189585.
Database references
SIMBAD	data

HD 197027 (HIP 102152) is a star in the constellation Capricornus that is located about 250 light years from the Sun.

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.

Age

The age of HD 197027, here annotated as HIP 102152, shown relative to the Sun, the younger solar twin 18 Scorpii and the formation of the Milky Way

External links

• Oldest Solar Twin Identified
• HIGH PRECISION ABUNDANCES OF THE OLD SOLAR TWIN HIP 102152: INSIGHTS ON LI DEPLETION FROM THE OLDEST SUN
• Oldest Solar Twin Identified