19 Draconis, also known as h Draconis, is a star in the constellation Draco. Its apparent magnitude is 4.89. Based on its parallax, the system is located about 49.8 light-years (15.26 parsecs) away.
19 Draconis is a binary star. Only the primary star can be detected, via Doppler shifts or perturbations around the system's barycenter. Using spectroscopy and astrometry, the nature of the secondary star can be inferred. The primary star is an F-type main-sequence star, 4% more massive than the Sun. Its surface temperature is about 6,298 K, and it emits just over twice the amount of energy that the Sun does. The secondary is only 37% as massive as the Sun, and its luminosity is only 2% that of the Sun. The two stars orbit each other every 52.1 days, and the system is about 4.7 billion years old.
Video 19 Draconis
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Source of the article : Wikipedia
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