1 Lupi

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1 Lupi
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lupus
Right ascension 15h 14m 37.31993s[1]
Declination −31° 31′ 08.8537″[1]
Apparent magnitude (V) 4.90[2]
Spectral type F1III[3]
U−B color index +0.26[2]
B−V color index 0.37[4]
Radial velocity (Rv) −22.80[5] km/s
Proper motion (μ) RA: −8.91[1] mas/yr
Dec.: –0.07[1] mas/yr
Parallax (π) 1.67 ± 0.22[1] mas
Distance approx. 2,000 ly
(approx. 600 pc)
Mass 6.9±0.1[6] M
Luminosity 2,900[7] L
Temperature 6,867[5] K
Rotational velocity (v sin i) 3.9±0.2[4] km/s
Age 47.1±3.8[6] Myr
Other designations
1 Lup, i Lup, CD−31° 11813, HD 135153, HIP 74604, HR 5660, SAO 206445.[8]
Database references

1 Lupi (abbreviated as 1 Lup) is a solitary[9] giant star in the southern constellation of Lupus. Its apparent magnitude is 4.90,[2] which indicates it is faintly visible to the naked eye. Based on parallax measurements made by the Hipparcos spacecraft, this star is approximately 2,000 light years from Earth.[1]

The spectral classification of this star is F1III,[3] which suggests it is an F-type that has evolved away from the main sequence and expanded into a giant star. It has a mass around seven times that of the Sun,[6] but a luminosity 2,900 times greater.[7] The estimated age of the star is around 47 million years.[6]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H. 
  4. ^ a b Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, Bibcode:2012A&A...542A.116A, arXiv:1204.2459Freely accessible, doi:10.1051/0004-6361/201118724, A116. 
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065. 
  6. ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883Freely accessible, doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ "i Lup -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-03-07. 
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.