# GG Lupi

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/GG_Lupi
> Markdown URL: https://mediated.wiki/source/GG_Lupi.md
> Source: https://en.wikipedia.org/wiki/GG_Lupi
> Source revision: 1349526566
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Binary star in the constellation Lupus

GG Lupi Location of GG Lupi (circled in red) Observation data Epoch J2000 Equinox J2000 Constellation Lupus Right ascension 15h 18m 56.3747s[1] Declination −40° 47′ 17.597″[1] Apparent magnitude (V) 5.58–6.11[2] Characteristics Spectral type B7V (primary) B9V (secondary) U−B color index −0.46[3] B−V color index −0.099[3] Variable type Algol[2] Astrometry Radial velocity (Rv) +4.0±1.0[3] km/s Proper motion (μ) RA: −19.219[1] mas/yr Dec.: −21.791[1] mas/yr Parallax (π) 6.6639±0.0894 mas[1] Distance 489 ± 7 ly (150 ± 2 pc) Absolute magnitude (MV) −0.53[4] Orbit[3] Period (P) 1.8495927 d Semi-major axis (a) 12.01 AU Eccentricity (e) 0.15 Inclination (i) 87.5° Details Primary Mass 4.16±0.12[3] M☉ Radius 2.42±0.05[3] R☉ Surface gravity (log g) 4.28[3] cgs Temperature 13,000[3] K Rotational velocity (v sin i) 97±8[5] km/s Secondary Mass 2.64±0.12[3] M☉ Radius 1.79±0.04[3] R☉ Surface gravity (log g) 4.30[3] cgs Temperature 10,600[3] K Rotational velocity (v sin i) 61±5[5] km/s Age 20[6] Myr Other designations HD 135876, HIP 74950, HR 5687, SAO 225647, 2MASS J15185637-4047176[7] Database references SIMBAD data

**GG Lupi** is an [eclipsing binary](/source/Eclipsing_binary) star in the southern constellation of [Lupus](/source/Lupus_(constellation)). Most of the time it is a [magnitude](/source/Apparent_magnitude) 5.6 object, making it faintly visible to the naked eye, but during the primary eclipse its brightness falls to 6.1.[2] GG Lupi is located one half-degree (one full moon diameter) west of the third-magnitude star [Delta Lupi](/source/Delta_Lupi).

A [light curve](/source/Light_curve) for GG Lupi, plotted from [TESS](/source/TESS) data[8]

This star was found to be a [spectroscopic binary](/source/Spectroscopic_binary) in 1930,[9] and its eclipses were detected in observations during 1964.[10] Its location in the sky, distance (~490 [light-years](/source/Light-year))[1] and [proper motion](/source/Proper_motion) make it a likely member of the [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_association) within the [Gould's Belt](/source/Gould's_Belt) star-formation region.[3] The two stars comprising this binary are both very young main-sequence stars of [spectral type B](/source/B-type_main-sequence_star). They are estimated to be about 20 million years old, placing them near the [zero-age main sequence](/source/Main_sequence#Formation_and_evolution).[6] Their orbit is somewhat eccentric (*e*=0.15) and the period of [apsidal precession](/source/Apsidal_precession) is 102 years.[11]

## References

1. ^ [***a***](#cite_ref-dr3_1-0) [***b***](#cite_ref-dr3_1-1) [***c***](#cite_ref-dr3_1-2) [***d***](#cite_ref-dr3_1-3) [***e***](#cite_ref-dr3_1-4) [***f***](#cite_ref-dr3_1-5) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6005849243285423104%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-IVSI_2-0) [***b***](#cite_ref-IVSI_2-1) [***c***](#cite_ref-IVSI_2-2) ["GG Lup"](https://www.aavso.org/vsx/index.php?view=detail.top&oid=17783). *The International Variable Star Index*. AAVSO. Retrieved 10 December 2022.

1. ^ [***a***](#cite_ref-Budding_3-0) [***b***](#cite_ref-Budding_3-1) [***c***](#cite_ref-Budding_3-2) [***d***](#cite_ref-Budding_3-3) [***e***](#cite_ref-Budding_3-4) [***f***](#cite_ref-Budding_3-5) [***g***](#cite_ref-Budding_3-6) [***h***](#cite_ref-Budding_3-7) [***i***](#cite_ref-Budding_3-8) [***j***](#cite_ref-Budding_3-9) [***k***](#cite_ref-Budding_3-10) [***l***](#cite_ref-Budding_3-11) [***m***](#cite_ref-Budding_3-12) Budding, E.; Butland, R.; Blackford, M. (April 2015). ["Absolute parameters of young stars: GG Lup and μ1 Sco"](https://doi.org/10.1093%2Fmnras%2Fstv234). *Monthly Notices of the Royal Astronomical Society*. **448** (4): 3784–3796. [arXiv](/source/ArXiv_(identifier)):[1502.04360](https://arxiv.org/abs/1502.04360). [Bibcode](/source/Bibcode_(identifier)):[2015MNRAS.448.3784B](https://ui.adsabs.harvard.edu/abs/2015MNRAS.448.3784B). [doi](/source/Doi_(identifier)):[10.1093/mnras/stv234](https://doi.org/10.1093%2Fmnras%2Fstv234).

1. **[^](#cite_ref-xhip_4-0)** 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-marcussen2022_5-0) [***b***](#cite_ref-marcussen2022_5-1) Marcussen, Marcus L.; Albrecht, Simon H. (2022). ["The BANANA Project. VI. Close Double Stars are Well Aligned with Noticeable Exceptions; Results from an Ensemble Study Using Apsidal Motion and Rossiter-McLaughlin Measurements"](https://doi.org/10.3847%2F1538-4357%2Fac75c2). *The Astrophysical Journal*. **933** (2): 227. [arXiv](/source/ArXiv_(identifier)):[2112.00824](https://arxiv.org/abs/2112.00824). [Bibcode](/source/Bibcode_(identifier)):[2022ApJ...933..227M](https://ui.adsabs.harvard.edu/abs/2022ApJ...933..227M). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ac75c2](https://doi.org/10.3847%2F1538-4357%2Fac75c2). [S2CID](/source/S2CID_(identifier)) [244799745](https://api.semanticscholar.org/CorpusID:244799745).

1. ^ [***a***](#cite_ref-Andersen_6-0) [***b***](#cite_ref-Andersen_6-1) Andersen, J.; Clausen, J. V.; Gimenez, A. (October 1993). "Absolute dimensions of eclipsing binaries. XX. GG LUPI : young metal-deficient B stars". *Astronomy and Astrophysics*. **277**: 439–451. [Bibcode](/source/Bibcode_(identifier)):[1993A&A...277..439A](https://ui.adsabs.harvard.edu/abs/1993A&A...277..439A).

1. **[^](#cite_ref-SIMBAD_7-0)** ["V* GG Lup -- Eclipsing Binary"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+GG+Lup+--+Eclipsing+Binary). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2022-12-10.

1. **[^](#cite_ref-MAST_8-0)** ["MAST: Barbara A. Mikulski Archive for Space Telescopes"](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html). Space Telescope Science Institute. Retrieved 10 December 2022.

1. **[^](#cite_ref-Neubauer_9-0)** Neubauer, F. J. (August 1930). "Forty-two Spectroscopic Binary Stars". *Publications of the Astronomical Society of the Pacific*. **42** (248): 235. [Bibcode](/source/Bibcode_(identifier)):[1930PASP...42..235N](https://ui.adsabs.harvard.edu/abs/1930PASP...42..235N). [doi](/source/Doi_(identifier)):[10.1086/124043](https://doi.org/10.1086%2F124043). [S2CID](/source/S2CID_(identifier)) [121035980](https://api.semanticscholar.org/CorpusID:121035980).

1. **[^](#cite_ref-Smith_10-0)** Smith, Lindsey F. (April 1966). ["HR 5687: A New Eclipsing Binary"](https://doi.org/10.1086%2F128320). *Publications of the Astronomical Society of the Pacific*. **78** (462): 168. [Bibcode](/source/Bibcode_(identifier)):[1966PASP...78..168S](https://ui.adsabs.harvard.edu/abs/1966PASP...78..168S). [doi](/source/Doi_(identifier)):[10.1086/128320](https://doi.org/10.1086%2F128320). [S2CID](/source/S2CID_(identifier)) [120477301](https://api.semanticscholar.org/CorpusID:120477301).

1. **[^](#cite_ref-Wolf_11-0)** Wolf, M.; Zejda, M. (July 2005). ["Apsidal motion in southern eccentric eclipsing binaries: V539 Ara, GG Lup, V526 Sgr and AO Vel"](https://doi.org/10.1051%2F0004-6361%3A20041868). *Astronomy and Astrophysics*. **437** (2): 545–551. [Bibcode](/source/Bibcode_(identifier)):[2005A&A...437..545W](https://ui.adsabs.harvard.edu/abs/2005A&A...437..545W). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20041868](https://doi.org/10.1051%2F0004-6361%3A20041868). [S2CID](/source/S2CID_(identifier)) [121307009](https://api.semanticscholar.org/CorpusID:121307009).

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

---
Adapted from the Wikipedia article [GG Lupi](https://en.wikipedia.org/wiki/GG_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/GG_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.