# 1 Lupi

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Star in the constellation Lupus

This article is about i Lupi (1 Lupi); not to be confused with [ι (iota) Lupi](/source/Iota_Lupi).

1 Lupi Location of 1 Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 Constellation Lupus Right ascension 15h 14m 37.32104s[1] Declination −31° 31′ 08.8434″[1] Apparent magnitude (V) 4.90[2] Characteristics Spectral type F1 III[3] or F0 Ib-II[4] U−B color index +0.26[2] B−V color index 0.37[5] Astrometry Radial velocity (Rv) −22.80[6] km/s Proper motion (μ) RA: −9.873[1] mas/yr Dec.: –0.892[1] mas/yr Parallax (π) 1.8055±0.1876 mas[1] Distance approx. 1,800 ly (approx. 550 pc) Absolute magnitude (MV) −3.93[7] Details Mass 6.9±0.1[8] M☉ Radius 41.3+2.2 −1.7[1] R☉ Luminosity 2,900[9] L☉ Temperature 6,867[6] K Rotational velocity (v sin i) 3.9±0.2[5] km/s Age 47.1±3.8[8] Myr Other designations i Lup, 1 Lup, CD−31°11813, HD 135153, HIP 74604, HR 5660, SAO 206445[10] Database references SIMBAD data

**1 Lupi** is a solitary[11] [giant star](/source/Giant_star) in the [southern](/source/Southern_celestial_hemisphere) [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It has the [Bayer designation](/source/Bayer_designation) **i Lupi**; *1 Lupi* is the [Flamsteed designation](/source/Flamsteed_designation). The [apparent visual magnitude](/source/Apparent_visual_magnitude) is 4.90,[2] which indicates it is faintly visible to the naked eye. Based on [parallax](/source/Stellar_parallax) measurements, this star is approximately 1,800 [light-years](/source/Light-year) from the [Sun](/source/Sun).[1] It is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −23 km/s.[6]

Houk (1978) assigned the [spectral classification](/source/Spectral_classification) of this star as F1III,[3] which suggests it is an [F-type](/source/F-type_star) (yellow-white) star that has evolved away from the [main sequence](/source/Main_sequence) and expanded into a [giant](/source/Giant_star). However, Gray et al. (2001) found a class of F0 Ib-II,[4] matching a [supergiant](/source/Supergiant)/[bright giant](/source/Bright_giant) star. It has a mass around seven times [that of the Sun](/source/Solar_mass)[8] and has expanded to 41[1] times the [Sun's radius](/source/Sun's_radius). The star is radiating 2,900[9] 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 6,867 [K](/source/Kelvin).[6] The estimated age of the star is around 47 million years.[8]

## References

1. ^ [***a***](#cite_ref-GaiaDR2_1-0) [***b***](#cite_ref-GaiaDR2_1-1) [***c***](#cite_ref-GaiaDR2_1-2) [***d***](#cite_ref-GaiaDR2_1-3) [***e***](#cite_ref-GaiaDR2_1-4) [***f***](#cite_ref-GaiaDR2_1-5) [***g***](#cite_ref-GaiaDR2_1-6) [***h***](#cite_ref-GaiaDR2_1-7) [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%206210657748086115328) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-MERMILLIOD_2-0) [***b***](#cite_ref-MERMILLIOD_2-1) [***c***](#cite_ref-MERMILLIOD_2-2) Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", *Catalogue of Eggen's UBV Data*, SIMBAD, [Bibcode](/source/Bibcode_(identifier)):[1986EgUBV........0M](https://ui.adsabs.harvard.edu/abs/1986EgUBV........0M).

1. ^ [***a***](#cite_ref-Houk1978_3-0) [***b***](#cite_ref-Houk1978_3-1) Houk, N. (1978), *Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars*, vol. 2, Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1978mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1978mcts.book.....H).

1. ^ [***a***](#cite_ref-Gray2001_4-0) [***b***](#cite_ref-Gray2001_4-1) Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", *The Astronomical Journal*, **121** (4): 2148–2158, [Bibcode](/source/Bibcode_(identifier)):[2001AJ....121.2148G](https://ui.adsabs.harvard.edu/abs/2001AJ....121.2148G), [doi](/source/Doi_(identifier)):[10.1086/319956](https://doi.org/10.1086%2F319956).

1. ^ [***a***](#cite_ref-AmmlerVonEiff2012_5-0) [***b***](#cite_ref-AmmlerVonEiff2012_5-1) Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", *Astronomy & Astrophysics*, **542**: A116, [arXiv](/source/ArXiv_(identifier)):[1204.2459](https://arxiv.org/abs/1204.2459), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...542A.116A](https://ui.adsabs.harvard.edu/abs/2012A&A...542A.116A), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201118724](https://doi.org/10.1051%2F0004-6361%2F201118724), [S2CID](/source/S2CID_(identifier)) [53666672](https://api.semanticscholar.org/CorpusID:53666672).

1. ^ [***a***](#cite_ref-Gontcharov_6-0) [***b***](#cite_ref-Gontcharov_6-1) [***c***](#cite_ref-Gontcharov_6-2) [***d***](#cite_ref-Gontcharov_6-3) 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, [arXiv](/source/ArXiv_(identifier)):[1606.08053](https://arxiv.org/abs/1606.08053), [Bibcode](/source/Bibcode_(identifier)):[2006AstL...32..759G](https://ui.adsabs.harvard.edu/abs/2006AstL...32..759G), [doi](/source/Doi_(identifier)):[10.1134/S1063773706110065](https://doi.org/10.1134%2FS1063773706110065), [S2CID](/source/S2CID_(identifier)) [119231169](https://api.semanticscholar.org/CorpusID:119231169).

1. **[^](#cite_ref-Anderson2012_7-0)** 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-mnras410_1_190_8-0) [***b***](#cite_ref-mnras410_1_190_8-1) [***c***](#cite_ref-mnras410_1_190_8-2) [***d***](#cite_ref-mnras410_1_190_8-3) 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, [arXiv](/source/ArXiv_(identifier)):[1007.4883](https://arxiv.org/abs/1007.4883), [Bibcode](/source/Bibcode_(identifier)):[2011MNRAS.410..190T](https://ui.adsabs.harvard.edu/abs/2011MNRAS.410..190T), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2010.17434.x](https://doi.org/10.1111%2Fj.1365-2966.2010.17434.x), [S2CID](/source/S2CID_(identifier)) [118629873](https://api.semanticscholar.org/CorpusID:118629873).

1. ^ [***a***](#cite_ref-Mcdonald2012_9-0) [***b***](#cite_ref-Mcdonald2012_9-1) McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", *Monthly Notices of the Royal Astronomical Society*, **427** (1): 343–57, [arXiv](/source/ArXiv_(identifier)):[1208.2037](https://arxiv.org/abs/1208.2037), [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.427..343M](https://ui.adsabs.harvard.edu/abs/2012MNRAS.427..343M), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2012.21873.x](https://doi.org/10.1111%2Fj.1365-2966.2012.21873.x), [S2CID](/source/S2CID_(identifier)) [118665352](https://api.semanticscholar.org/CorpusID:118665352).

1. **[^](#cite_ref-SIMBAD_10-0)** ["i Lup -- Star"](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=1+Lupi), *SIMBAD Astronomical Database*, [Centre de Données astronomiques de Strasbourg](/source/Centre_de_Donn%C3%A9es_astronomiques_de_Strasbourg), retrieved 2016-03-07.

1. **[^](#cite_ref-mnras389_2_869_11-0)** 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).

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 [1 Lupi](https://en.wikipedia.org/wiki/1_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/1_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.