Psi1 Aurigae
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Psi1 Aurigae (ψ1 Aur, ψ1 Aurigae) is a star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.91.[1] Based upon a measured annual parallax shift of Template:Val,[2] it is approximately Template:Convert distant from the Earth. It is receding from the Sun with a radial velocity of +4.7 km/s.[3]
This is a massive supergiant star with a stellar classification of K5-M1Iab-Ib.[5] It is a slow irregular variable of the LC type, with its brightness varying in magnitude by 0.44.[6] The star is more than 14[7] times as massive as the Sun, over 900 times larger, and is blazing with 170,000 times the Sun's luminosity.[8] It is one of the largest stars known, even larger and more luminous than well-known red supergiants Betelgeuse and Antares. This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 3,790 K,[8] giving it the orange-red hue of a cool M-type star. Template:Clear left
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