59 Andromedae, abbreviated 59 And, is a binary star system in the northern constellation of Andromeda with a combined apparent magnitude of 5.64. 59 Andromedae is the Flamsteed designation. As of 2017, the pair had an angular separation of along a position angle (PA) of 36°. Compare this to a separation of along a PA of 35°, as measured in 1783. The two stars have an estimated physical separation of .
The magnitude 6.09 primary component is a B-type main-sequence star with a stellar classification of B9 V. It has 2.62 times the Sun's radius and is radiating 91 times the Sun's luminosity from its photosphere at an effective temperature of . It is spinning with a projected rotational velocity of 176 km/s.
The secondary is a magnitude 6.82 A-type main-sequence star with a class of A1 Vn, where the 'n' suffix indicates "nebulous" lines due to rapid rotation. It is spinning with a high projected rotational velocity of 233 km/s. The star has 2.34 times the Sun's mass and 2.23 times the Sun's radius. It is radiating 32 times the luminosity of the Sun and has an effective temperature of .
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External links Image 59 Andromedae