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Phi1 Lupi

Star in the constellation Lupus

Star in the constellation Lupus

| b-v = | u-b = +1.85 | r-i =

Phi1 Lupi is a solitary star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.58. Based upon an annual parallax shift of 11.86 mas as seen from Earth, it is located around 275 light years from the Sun. The star is drifting closer with a radial velocity of −29 km/s. It has an absolute magnitude of −1.55.

This is an evolved K-type giant star with a stellar classification of K5 III, which means it has used up its core hydrogen and has expanded. At present it has 40 times the radius of the Sun. It is a variable star of unknown type, with an amplitude of 0.008 in visual magnitude and a period of 4.82 days. The star is radiating 1,413 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of .

References

| trans-title=The absolute magnitudes of the G to M type MK standards from the Hipparcos parallaxes | display-authors=1 | last1=Ginestet | first1=N.

| publication-place=Ann Arbor, Michigan

| access-date=2017-03-10 | postscript=. }}

References

  1. {{cite DR2. 6007749027571497472
  2. {{cite constellation. HR 5705
  3. (2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics.
  4. (2002). "A catalogue of calibrator stars for long baseline stellar interferometry". Astronomy and Astrophysics.
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k-type-giants suspected-variables zeta-herculis-moving-group lupus-(constellation) bayer-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects durchmusterung-objects
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