# Phi1 Lupi

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Star in the constellation Lupus

For other stars with this Bayer designation, see [φ Lupi](/source/Phi_Lupi).

φ1 Lupi Location of φ1 Lupi (circled) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus[1] 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] Distance 275 ± 4 ly (84 ± 1 pc) Absolute magnitude (MV) −1.55[7] Details Mass 1.78[8] M☉ Radius 40[9] R☉ Luminosity 1,413[8] L☉ Surface gravity (log g) 1.93[10] cgs Temperature 3,800[8] K Metallicity [Fe/H] −0.40[8] dex Other designations φ1 Lup, CD−35°10236, FK5 566, HD 136422, HIP 75177, HR 5705, SAO 206552[11] Database references SIMBAD data

A [light curve](/source/Light_curve) for Phi1 Lupi, plotted from *[Hipparcos](/source/Hipparcos)* data[12]

**Phi1 Lupi** is a solitary[13] [star](/source/Star) in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 3.58.[3] Based upon an annual [parallax shift](/source/Stellar_parallax) of 11.86 [mas](/source/Milliarcsecond) as seen from Earth, it is located around 275 [light years](/source/Light_year) from the [Sun](/source/Sun). The star is drifting closer with a [radial velocity](/source/Radial_velocity) of −29 km/s.[6] It has an [absolute magnitude](/source/Absolute_magnitude) of −1.55.[7]

This is an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of K5 III,[4] which means it has used up its core [hydrogen](/source/Hydrogen) and has expanded. At present it has 40 times the [radius of the Sun](/source/Radius_of_the_Sun).[9] It is a [variable star](/source/Variable_star) of unknown type, with an [amplitude](/source/Amplitude) of 0.008 in visual magnitude and a period of 4.82 days.[14] The star is radiating 1,413 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun) from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 3,800 [K](/source/Kelvin).[8]

## References

1. **[^](#cite_ref-constellation_1-0)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=HR+5705&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-vanLeeuwen2007_2-0) [***b***](#cite_ref-vanLeeuwen2007_2-1) [***c***](#cite_ref-vanLeeuwen2007_2-2) [***d***](#cite_ref-vanLeeuwen2007_2-3) [***e***](#cite_ref-vanLeeuwen2007_2-4) van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-Mermilliod1986_3-0) [***b***](#cite_ref-Mermilliod1986_3-1) [***c***](#cite_ref-Mermilliod1986_3-2) Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", *Catalogue of Eggen's UBV Data*, [SIMBAD](/source/SIMBAD), [Bibcode](/source/Bibcode_(identifier)):[1986EgUBV........0M](https://ui.adsabs.harvard.edu/abs/1986EgUBV........0M).

1. ^ [***a***](#cite_ref-houk1979_4-0) [***b***](#cite_ref-houk1979_4-1) 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](/source/Bibcode_(identifier)):[1982mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1982mcts.book.....H).

1. **[^](#cite_ref-Anderson2012_5-0)** Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-deBruijne2012_6-0) [***b***](#cite_ref-deBruijne2012_6-1) 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](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-Ginestet2000_7-0) [***b***](#cite_ref-Ginestet2000_7-1) 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](/source/Bibcode_(identifier)):[2000A&AS..142...13G](https://ui.adsabs.harvard.edu/abs/2000A&AS..142...13G), [doi](/source/Doi_(identifier)):[10.1051/aas:2000135](https://doi.org/10.1051%2Faas%3A2000135).

1. ^ [***a***](#cite_ref-charbonnel2020_8-0) [***b***](#cite_ref-charbonnel2020_8-1) [***c***](#cite_ref-charbonnel2020_8-2) [***d***](#cite_ref-charbonnel2020_8-3) [***e***](#cite_ref-charbonnel2020_8-4) Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". *Astronomy and Astrophysics*. **633**: A34. [arXiv](/source/ArXiv_(identifier)):[1910.12732](https://arxiv.org/abs/1910.12732). [Bibcode](/source/Bibcode_(identifier)):[2020A&A...633A..34C](https://ui.adsabs.harvard.edu/abs/2020A&A...633A..34C). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201936360](https://doi.org/10.1051%2F0004-6361%2F201936360).

1. ^ [***a***](#cite_ref-dr2_9-0) [***b***](#cite_ref-dr2_9-1) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206007749027571497472) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-cardiel2021_10-0)** Bordé, P.; Coudé Du Foresto, V.; Chagnon, G.; Perrin, G. (2002). "A catalogue of calibrator stars for long baseline stellar interferometry". *Astronomy and Astrophysics*. **393**: 183. [Bibcode](/source/Bibcode_(identifier)):[2002A&A...393..183B](https://ui.adsabs.harvard.edu/abs/2002A&A...393..183B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20021020](https://doi.org/10.1051%2F0004-6361%3A20021020).

1. **[^](#cite_ref-SIMBAD_11-0)** ["* phi01 Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+phi01+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-10.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: postscript ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_postscript))

1. **[^](#cite_ref-CDS_12-0)** ["/ftp/cats/more/HIP/cdroms/cats"](https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats). *Centre de Données astronomiques de Strasbourg*. Strasbourg astronomical Data Center. Retrieved 15 October 2022.

1. **[^](#cite_ref-Eggleton2008_13-0)** Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-Koen2002_14-0)** Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **331** (1): 45–59, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0112194](https://arxiv.org/abs/astro-ph/0112194), [Bibcode](/source/Bibcode_(identifier)):[2002MNRAS.331...45K](https://ui.adsabs.harvard.edu/abs/2002MNRAS.331...45K), [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.2002.05150.x](https://doi.org/10.1046%2Fj.1365-8711.2002.05150.x), [S2CID](/source/S2CID_(identifier)) [10505995](https://api.semanticscholar.org/CorpusID:10505995).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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Adapted from the Wikipedia article [Phi1 Lupi](https://en.wikipedia.org/wiki/Phi1_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Phi1_Lupi?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.