フォーマルハウト

Fomalhaut stands in comparative isolation, the solitary bright star of the southern constellation Piscis Austrinus and long nicknamed the Lonely Star of autumn evenings. Designated Alpha Piscis Austrini, it is a white A-type star 25 light-years distant, with a B–V colour index of 0.145. At apparent magnitude 1.17 it is the only first-magnitude star across a wide, dim stretch of sky, and its absolute magnitude of 1.74 shows an intrinsic brightness a little above the Sun's. A declination of −29° keeps Fomalhaut low for northern observers, where its lone glow low over the horizon makes it easy to identify.