HD 13931 is a Sun-like star in the constellation Andromeda, located in the northern hemisphere. It has 1.3 times the mass of the Sun and 1.25 times the radius. With an apparent visual magnitude of 7.60, it can be seen with binoculars or a small telescope but is too faint to be seen with the naked eye. It is 154.59 light-years away from the solar system and is estimated to be 8.4 billion years old, as opposed to the Sun’s 4.6 billion years. This object is 155 light-years away from the Sun, as determined by its parallax, and is moving away with a radial velocity of +30 km/s.
HD 13931 is not a part of the Andromeda constellation outline, but it is within its boundaries. The color of HD 13931 is yellow based on the star’s spectral type (G0). The star cannot be seen with the naked eye; you must use a telescope to see it. According to Hipparcos, the star has an estimated age of 7.30 billion years, but it could be as young as 5.20 to 8.90. It is believed to have at least one Extrasolar Planet in orbit around the star.
This is a regular G-type main-sequence star with the stellar classification G0V, indicating that it, like the Sun, generates energy through core hydrogen fusion. HD 13931 is located approximately 152.5 light-years (46.8 pc) from our Solar System. It is slightly bigger, hotter, brighter, and heavier than our Sun.
HD 13931 has an apparent magnitude of 7.6 and an absolute magnitude of 4.3. The metal content is approximately 8% higher than that of the Sun, and it has a quiet (magnetically inactive) chromosphere. The star is estimated to be 6.8 billion years old and has a rotation period of about 26 days. It is 1.0 times more massive and 1.2 times larger than our Sun. The surface temperature is 5829 degrees Celsius, and the spectral type is G0.
The number of extrasolar planets is one. HD 13931 b has a radius of 0.907830, a mass of 1.880000, and an orbital distance of 5.150000. By measuring changes in the star’s radial velocity, a very long-period giant planet more massive than Jupiter was discovered in orbit around the star in 2009. At a typical distance of 5.15 AU, it takes this planet 11.55 years to orbit the star (770 Gm). The eccentricity of the planet (0.02) is similar to that of Earth.
According to a 2018 study, HD 13931 is the most promising Solar System analogue known, as it has a star similar to the Sun and a planet with the same mass and semimajor axis as Jupiter. These characteristics suggest that there is a nearly 75% chance of the existence of a dynamically stable habitable zone, where an Earth-like planet could exist and sustain life.
