HD 150248

HD 150248 is a binary star system^[5] in the constellation Scorpius, close to the border with Ara. Its primary component is a G-type star, notable for being a near solar twin.^[7] HD 150248's photometric color is also very close to that of the Sun; however, it has a lower abundance of metals, and has an apparent visual magnitude of 7.02. At 8.1 billion years old, this star is over three billion years older than the Sun.

To date, no solar twin with an exact match to that of the Sun has been found. However, there are some stars that come very close to being identical, and thus considered solar twins by the astronomical community. An exact solar twin would be a G2V star with a 5772 K temperature, be 4.6 billion years old, with solar metallicity, and a 0.1% solar luminosity variation.^[8] Stars with an age of 4.6 billion years, such as the Sun, are at the most stable state. Proper metallicity and size are also very important to low luminosity variation.^[9][10][11]

Both components of this system orbit with a period of 3,253.2 days (8.907 years) and have a high eccentricity of 0.66872, putting the stars as close as 1.48 AU in the periastron, and as distant as 7.42 AU in the apoastron. A circumbinary companion would need to orbit at a separation of at least 18.4 AU to have a stable orbit. Meanwhile, for an S-type companion orbiting either A or B, this would be less than 0.446 and 0.186  AU, respectively.^[5]