13 Delphini

Double star in the constellation Delphinus 13 Delphini J2000.0 (ICRS) Delphinus A 20 47 48.3330 +06 00 29.551 5.66 B 20 47 48.3012 +06 00 28.127 8.51 A main sequence A0 V −0.01 −0.09 −74.3 −0.01 y A 6.9265 0.0489 +8.255 −13.162 B 6.6697 0.0989 +5.663 −12.280 A 2.510.31 0.36 3.70.4 11920 17 3.690.61 0.69 0.00 9,84091 90 170 307 B 1.5 6,449 3.90 −0.14 13 Del 18 G. Delphini +05°4613 +05°3035 28986 198069 102633 7953 126222 J20478+0600A 13+Del 13 Delphini is a binary star in the northern constellation of Delphinus, with a combined apparent magnitude of 5.64. The system is located at a distance of 471 light years but is approaching the Solar System with a heliocentric radial velocity of about -7 km/s. 13 Delphini A has an apparent magnitude of 5.66, while its companion has an apparent magnitude of 8.51. As of 2016, the pair have a separation of 1.5 arcsecond located at a position angle of 200 °. 13 Delphini has a blended stellar classification of A0 V, indicating that it is an ordinary A-type main-sequence star. However, when the components are analysed individually, the primary star is given a class of B9V. It has 2.51 times the mass of the Sun and has an effective temperature of 9,840 K. However, the star is large for its class, having a radius almost 4 times that of the Sun and a luminosity 119 times greater. This is due to 13 Delphini having completed 86.1% of its main sequence lifetime and has led one source to classify it as a subgiant instead. It spins rapidly with a projected rotational velocity of 170 km/s and has an age of 307 million years. 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