Magnitude 9.18 Apparent magnitude (V) 9.18 | Constellation Capricornus | |
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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 older 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 than the Sun, at 8.2 Billion years old. The fact that the abundances are so similar to the Sun's suggests that it is a potential candidate for hosting terrestrial type planets.
Sun comparison
This chart compares the sun to HD 197027/HIP 102152.
An exact solar twin would be a G2V star with a 5,778K temperature, be 4.6 billion years old, with the correct metallicity and a 0.1% solar luminosity variation. Stars with an age of 4.6 billion years are at the most stable state. Proper metallicity and size are also very important to low luminosity variation.