Magnitude 4.79 Apparent magnitude (V) 4.79 | Constellation Auriga | |
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Psi2 Aurigae (ψ2 Aur, ψ2 Aurigae) is a star in the constellation Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.79. Based upon parallax measurements, this star is approximately 420 light-years (130 parsecs) away from the Earth. At that distance, the brightness of the star is diminished by 0.07 in magnitude from extinction caused by interstellar gas and dust.
Most studies categorized this as a K-type giant star with a stellar classification of K3 III. However, the results of a study published in 2003 list it with a classification of K3 Iab:, which would instead suggest it is a supergiant star. The measured angular diameter of this star, after correction for limb darkening, is 1.97 ± 0.02 mas. At the estimated distance of this star, this yields a physical size of about 27 times the radius of the Sun.