70 Aquilae

70 Aquilae, abbreviated 70 Aql, is a single orange-hued star in the equatorial constellation of Aquila. "70 Aquilae" is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.90. The distance to 70 Aquilae, as determined from its annual parallax shift of , is around 940 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.
Classification.
Perkins et al. (1989) found a stellar classification of for this star, suggesting it is a K-type giant with abundance anomaly of barium. Houk and Swift (1999) matched an ordinary giant with a class of K3 III. Many sources still use the 1991 Bright Star Catalogue classification of K5 II, which instead suggests a bright giant star.
Size and temperature.
The interferometry-measured angular diameter of this star, after correcting for limb darkening, is , which, at its estimated distance, equates to a physical radius of roughly 102 times the radius of the Sun. 70 Aquilae is about 63 million years old with 6 times the mass of the Sun. It is radiating 4,072 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,900 K.
References.
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