Psi5 Aurigae
Psi5 Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ5 Aurigae, and abbreviated Psi5 Aur or ψ5 Aur. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.25. Based upon parallax measurements, this star is distant from Earth. It is drifting closer to the Sun with a radial velocity of −24 km/s.
This is an ordinary, Sun-like star with an orbiting debris disk. No exoplanetary companions have yet been discovered.
Observations
The spectrum of this star shows it to be an ordinary G-type main sequence star with a stellar classification of G0 V. The properties are sufficiently similar to the Sun that it is considered a solar analog. It is an estimated 3.2 billion years old and is spinning with a projected rotational velocity of 5 km/s. This star has 17% more mass and 18% greater radius compared to the Sun, while the composition is similar to the Sun. It is radiating 1.75 the luminosity of the Sun into space from its photosphere at an effective temperature of 6,086 K, giving it the golden-hued glow of a G-type star.Observation in the infrared shows an excess emission that suggests the presence of a circumstellar disk of dust, known as a debris disk. This material has a mean temperature of 60 K, indicating that it is orbiting at a distance of about from the host star, ranging from with an inclination of to the plane of the sky. The dust has about half the mass of the Moon and is around 600 million years old. The star is being examined for evidence of extrasolar planets, but none have been found as of 2006.
There is an optical companion which is 36 arcseconds away and has an apparent magnitude of +8.4. Psi5 Aurigae used to be known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union.