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Phi1 Lupi is a solitary[11] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.58.[3] 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.[6] It has an absolute magnitude of −1.55.[7]

For other stars with this Bayer designation, see φ Lupi.
Phi1 Lupi

A light curve for Phi1 Lupi, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 21m 48.36967s[2]
Declination −36° 15′ 40.9525″[2]
Apparent magnitude (V) 3.58[3]
Characteristics
Spectral type K5 III[4]
U−B color index +1.85[3]
B−V color index +1.534±0.005[5]
Astrometry
Radial velocity (Rv)−29.4±0.7[6] km/s
Proper motion (μ) RA: −92.33[2] mas/yr
Dec.: −85.67[2] mas/yr
Parallax (π)11.86 ± 0.16 mas[2]
Distance275 ± 4 ly
(84 ± 1 pc)
Absolute magnitude (MV)−1.55[7]
Details
Radius40[8] R☉
Luminosity711.28[5] L☉
Temperature3,894±59[9] K
Other designations
φ1 Lup, CD−35°10236, FK5 566, HD 136422, HIP 75177, HR 5705, SAO 206552[10]
Database references
SIMBADdata

This is an evolved K-type giant star with a stellar classification of K5 III,[4] which means it has used up its core hydrogen and has expanded. At present it has 40 times the radius of the Sun.[8] It is a variable star of unknown type, with an amplitude of 0.008 in visual magnitude and a period of 4.82 days.[12] The star is radiating 711[5] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,894 K.[9]


References


  1. "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  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, S2CID 18759600.
  3. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  4. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  7. Ginestet, N.; et al. (February 2000), "Magnitudes absolues des étoiles standards MK des types G à M à partir des parallaxes Hipparcos" [The absolute magnitudes of the G to M type MK standards from the Hipparcos parallaxes], Astronomy and Astrophysics Supplement (in French), 142: 13–24, Bibcode:2000A&AS..142...13G, doi:10.1051/aas:2000135.
  8. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. Strassmeier, K. G.; Schordan, P. (2000), "A temperature calibration for MK-class III giants from high-resolution spectral line-depth ratios", Astronomische Nachrichten, 321 (5): 277–305, Bibcode:2000AN....321..277S, doi:10.1002/1521-3994(200012)321:5/6<277::AID-ASNA277>3.0.CO;2-H.
  10. "* phi01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-10.{{cite web}}: CS1 maint: postscript (link)
  11. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.

На других языках

- [en] Phi1 Lupi

[ru] Фи¹ Волка

Фи¹ Волка (лат. φ¹ Lupi), HD 136422 — кратная звезда в созвездии Волка на расстоянии приблизительно 307 световых лет (около 94,2 парсеков) от Солнца.


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