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Phi Aquarii

Star in the constellation Aquarius

Summary

Star in the constellation Aquarius

| x%=32.3 | y%=40.3 | b-v = +1.563 | u-b = +1.897

Phi Aquarii is a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from φ Aquarii, and abbreviated Phi Aqr or φ Aqr. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.223. Parallax measurements indicate its distance from Earth is approximately 227 ly. It is drifting further away with a radial velocity of +2.5 km/s. The system is positioned 1.05 degrees south of the ecliptic so it is subject to lunar occultations.

This is a spectroscopic binary star system with an estimated period of 2500 days. The primary component is an aging red giant star with a stellar classification of M1.5 III. At an estimated age of 11 billion years, it has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The star has the same mass as the Sun, but has expanded to 35 times the Sun's girth. It is radiating 208 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,715 K, giving it the reddish hue of an M-type star.

On 6 September 2019, it had a close conjunction (geocentric separation

References

| display-authors=1 | journal=The Astronomical Journal

| access-date=2025-04-09 | archive-date=2025-04-05 | archive-url=https://web.archive.org/web/20250405185720/https://falakmu.id/khgt/dokumen/More%20mathematical%20astronomy%20morsels%20%28Jean%20Meeus%29%20%28Z-Library%29.pdf | url-status=dead

References

  1. {{cite Gaia DR3. 2632117385335567872
  2. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal.
  3. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics.
  4. (1966). "A System of photometric standards". Publicaciones Universidad de Chile, Department de Astronomy.
  5. "* phi Aqr".
  6. (September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
  7. (May 2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics.
  8. (December 21, 2004). "The Colour of Stars". Commonwealth Scientific and Industrial Research Organisation.
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m-type-giants spectroscopic-binaries aquarius-(constellation) bayer-objects bright-star-catalogue-objects durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects
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