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19 Lyrae

19 Lyrae is a single^[10] variable star located approximately 950^[2] light years away from the Sun in the northern constellationofLyra.^[9] It has the variable star designation V471 Lyr, while 19 Lyrae is the Flamsteed designation. This object is just bright enough to be visible to the naked eye, appearing as a dim, blue-white star with a baseline apparent visual magnitude of 5.93.^[3] It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and may come as close as 167 light-years around 8.5 million years from now.^[3]

This is a magnetic chemically-peculiar star^[11] with a stellar classificationofB8 IIIp Si Sr,^[4] showing abundance anomalies in silicon and strontium. The light variations of this star were discovered by J. E. Winzer in 1974.^[12] It is an Alpha² Canum Venaticorum-type variable with a period of 1.160898 days (or 7.0980 days^[12]), ranging in magnitude from a high of 5.91 down to 5.98.^[5] The surface magnetic field has a strength of (111.3±56.9)×10⁻⁴ T^[13]

19 Lyrae has a moderate rotation rate, showing a projected rotational velocity of 35 km/s.^[8] Stellar models give it an estimated 3.8^[6] times the mass of the Sun and its girth is measured at 6.4^[7] times the Sun's radius. It is radiating 397^[3] times the luminosity of the Sun from its photosphere at an effective temperature of around 11,194 K.^[6] The star has an absolute magnitude of −1.24,^[3] which shows how bright the star would appear if it were located at a distance of 10 parsecs (33 ly) from the Sun.