3 Piscis Austrini

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3 Piscis Austrini, also known as HD 201901 or simply 3 PsA, is an astrometric binary[1] (100% chance[2]) located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The system has a combined apparent magnitude of 5.39,[3] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 404 light years[4] and it is currently approaching the Solar System with a heliocentric radial velocity of Template:Val.[5] At its current distance, 3 PsA's brightness is diminished by 0.12 magnitudes due to extinction from interstellar dust[6] and it has an absolute magnitude of +0.19.[7]

The visible component is an evolved red giant with a stellar classification of K3 III.[8] The interferometry-measured angular diameter of the star, after correcting for limb darkening, is Template:Val,[9] which, at its estimated distance, equates to a physical radius of about 20 times the radius of the Sun.[10] However, its actual empirical radius is Template:Solar radius.[11] It has 1.58 times the mass of the Sun[12] and is radiating 184 times the luminosity of the Sun[4] from its enlarged photosphere at an effective temperature of Template:Val.[13] 3 PsA is metal deficient with an iron abundance 68% that of the Sun ([Fe/H] = −0.17)[14] and it spins too slowly for its projected rotational velocity to be measured accurately.[15] It is estimated to be 2.59 billion years old based on Gaia DR3 models.[4]

References

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  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Frankowski2006
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Tycho2000
  4. ↑ 4.0 4.1 4.2 Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2006
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2017
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Houk1982
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Richichi2005
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named lang2006
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kervella2004
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anders2019
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Stassun2019
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named McWilliam1990
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named De Medeiros2014
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