Psi1 Lupi

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For other star systems with this Bayer designation, see ψ Lupi.
ψ1 Lupi
Observation data
Epoch 2000      Equinox 2000
Constellation Lupus
Right ascension 15h 39m 45.97886s[1]
Declination –34° 24′ 42.9065″[1]
Apparent magnitude (V) +4.663[2]
Spectral type G8/K0 III[3]
Parallax (π)14.85 ± 0.28[1] mas
Distance205.38 ly
(63 [4] pc)
Absolute magnitude (MV)+0.24[5]
Mass2.42[5] M
Radius13[4] R
Diameter13[4] D
Luminosity72.92[6] L
Surface gravity (log g)3.28[7] cgs
Temperature4,930[4] K
Metallicity [Fe/H]−0.34[7] dex
Other designations
ψ1 Lup, 3 Lup, CD−33°10631, HD 139521, HIP 76705, FK5 3237, HR 5820, SAO 206843
Database references

Psi1 Lupi1 Lupi) is an red clump[2] giant star located 205 light years away from the Sun, in the Lupus constellation. The star is surrounded by a cold circumstellar envelope, hinted at by the anomaly of the small observed power of the doublet Mg II emission at 2800 angstrom. The absorption cores on the peaks of the emission profiles Mg II k and h are mainly of interstellar origin and only partly due to self-absorption in the star's chromosphere.[4]


  1. 1.0 1.1 1.2 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 2.0 2.1 Alves, David R. (2000). "K-Band Calibration of the Red Clump Luminosity". The Astrophysical Journal 539 (2): 732. arXiv:astro-ph/0003329. Bibcode 2000ApJ...539..732A. doi:10.1086/309278.
  3. Houk, N. (1982). "Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0". Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode
  4. 4.0 4.1 4.2 4.3 Gurzadian, G. A.; Kondo, Y.; Ohanesyan, J. B.; Terzian, Yervant; Perez, Mario R. (1991). "A cool giant with a circumstellar cloud". Astrophysics and Space Science 176 (1): 61–68. Bibcode 1991Ap&SS.176...61G. doi:10.1007/BF00643077.
  5. 5.0 5.1 Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics 361: 614–628, Bibcode 2000A&A...361..614P
  6. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427: 343. arXiv:1208.2037. Bibcode 2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. 7.0 7.1 Adibekyan, V. Zh.; Benamati, L.; Santos, N. C.; Alves, S.; Lovis, C.; Udry, S.; Israelian, G.; Sousa, S. G. et al. (2015). "Chemical abundances and kinematics of 257 G-, K-type field giants. Setting a base for further analysis of giant-planet properties orbiting evolved stars". Monthly Notices of the Royal Astronomical Society 450 (2): 1900. arXiv:1503.08346. Bibcode 2015MNRAS.450.1900A. doi:10.1093/mnras/stv716.

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