Binary star system in the constellation in the constellation of Draco
HD 151613 is a binary star system in the northern circumpolar constellation of Draco . It is visible to the naked eye with an apparent visual magnitude of 4.84. The distance to this star, as estimated from its annual parallax shift of 39.3 mas , is 83 light years . It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.
This is a single-lined spectroscopic binary system with an orbital period of 363.57 days and an eccentricity of 0.35. The pair were resolved through speckle interferometry in 1977, showing an angular separation of 0.041″ . They were later resolved in 1981 with a separation of 0.047″, but were unresolved during 20 other attempts between 1976–1991. The system is a source of X-ray emission . The visible component is an F-type main-sequence star with a stellar classification of F2 V. It is around 2.3 billion years old with a projected rotational velocity of 48 km/s.
References
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"HD 151613" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-07-18.Hartkopf, William I.; Mason, Brian D. (September 2009), "Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits", The Astronomical Journal , 138 (3): 813–826, Bibcode :2009AJ....138..813H , doi :10.1088/0004-6256/138/3/813 .
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