Beta Piscis Austrini
Binary star with a white primary and a G-type companion.
Beta Piscis Austrini is a star in the southern constellation of Piscis Austrinus that forms part of a binary star system. It is visible to the naked eye with an apparent visual magnitude of +4.29 and is located approximately 143 light years from the Sun. The system is a source of X-ray emission, most likely coming from an external source.
Quick Facts
- Bayer designation
- β Piscis Austrini
- Apparent visual magnitude
- +4.29
- Parallax
- 22.84 mas
- Distance
- 143 light years
- Spectral type
- A1 V
- Mass
- 2.20 solar masses
- Projected rotational velocity
- 26 km/s
- Luminosity
- 26 solar luminosities
Facts from the source article.
Characteristics
Beta Piscis Austrini is a white-hued A-type main sequence star with a stellar classification of A1 V. It has an estimated 2.20 times the mass of the Sun and spins with a projected rotational velocity of 26 km/s, though the stellar equator is seen nearly pole-on. As a result of its fast rotation, the star has an oval shape, with the equatorial circumference longer than the polar circumference, and an equatorial temperature cooler than the polar temperature due to gravity darkening. The star radiates 26 times the solar luminosity from its photosphere. It is moving through the Galaxy at a speed of 14.4 km/s relative to the Sun, and its projected Galactic orbit carries it between 7328 pc and 8697 pc from the center of the Galaxy. There is evidence for an infrared excess, indicating an orbiting debris disk with an estimated temperature of 188 K, suggesting an orbital distance of 12 AU from the host star. Beta Piscis Austrini has a proper motion companion named CD-32°17127, of apparent magnitude 7.04. It is a G-type main-sequence star of spectral class G1V, with 1.04 times the mass of the Sun, 1.03 times the Sun's radius, a luminosity 1.22 times solar, and an effective temperature of . This star is separated from β Piscis Austrini by 1,376 astronomical units. With Delta and Zeta it constituted Tien Kang ("heavenly rope") in China.
More in Bright Stars by Bayer Designation: Binary and Multiple Stars
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