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GG Lupi

A light curve for GG Lupi, plotted from TESS data
Observation data Epoch J2000      Equinox J2000
Constellation	Lupus
Right ascension	15 18 56.3747
Declination	−40° 47′ 17.597″
Apparent magnitude (V)	5.58 - 6.11
Characteristics
Spectral type	B7V (primary) B9V (secondary)
U−B color index	−0.46
B−V color index	−0.099
Variable type	Algol
Astrometry
Radial velocity (Rv)	+4.0±1.0 km/s
Proper motion (μ)	RA: −19.219 mas/yr Dec.: −21.791 mas/yr
Parallax (π)	6.6639 ± 0.0894 mas
Distance	489 ± 7 ly (150 ± 2 pc)
Absolute magnitude (MV)	−0.53
Orbit
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 M☉
Radius	2.42±0.05 R☉
Surface gravity (log g)	4.28 cgs
Temperature	13,000 K
Rotational velocity (v sin i)	97±8 km/s
Secondary
Mass	2.64±0.12 M☉
Radius	1.79±0.04 R☉
Surface gravity (log g)	4.30 cgs
Temperature	10,600 K
Rotational velocity (v sin i)	61±5 km/s
Age	20 Myr
Other designations
HD 135876, HIP 74950, HR 5687, SAO 225647, 2MASS J15185637-4047176
Database references
SIMBAD	data

GG Lupi is an eclipsing binary star in the southern constellation of Lupus. Most of the time it is a magnitude 5.6 object, making it faintly visible to the naked eye, but during the primary eclipse its brightness falls to 6.1. GG Lupi is located 1/2 degree (one full moon diameter) west of the 3rd magnitude star Delta Lupi.

This star was found to be a spectroscopic binary in 1930, and its eclipses were detected in observations during 1964. Its location in the sky, distance (~490 light years) and proper motion make it a likely member of the Scorpius–Centaurus Association within the Gould's Belt star formation region. The two stars comprising this binary are both very young main sequence stars of spectral type B. They are estimated to be about 20 million years old, placing them near the zero-age main sequence. Their orbit is somewhat eccentric (e=0.15) and the period of apsidal precession is 102 years.

References

1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 10 December 2022.
2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. ^ "GG Lup". The International Variable Star Index. AAVSO. Retrieved 10 December 2022.
4. ^ Budding, E.; Butland, R.; Blackford, M. (April 2015). "Absolute parameters of young stars: GG Lup and μ1 Sco". Monthly Notices of the Royal Astronomical Society. 448 (4): 3784–3796. arXiv:1502.04360. Bibcode:2015MNRAS.448.3784B. doi:10.1093/mnras/stv234.
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. ^ 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". The Astrophysical Journal. 933 (2): 227. arXiv:2112.00824. Bibcode:2022ApJ...933..227M. doi:10.3847/1538-4357/ac75c2. S2CID 244799745.
7. ^ 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:1993A&A...277..439A.
8. "V* GG Lup -- Eclipsing Binary". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-12-10.
9. Neubauer, F. J. (August 1930). "Forty-two Spectroscopic Binary Stars". Publications of the Astronomical Society of the Pacific. 42 (248): 235. Bibcode:1930PASP...42..235N. doi:10.1086/124043. S2CID 121035980.
10. Smith, Lindsey F. (April 1966). "HR 5687: A New Eclipsing Binary". Publications of the Astronomical Society of the Pacific. 78 (462): 168. Bibcode:1966PASP...78..168S. doi:10.1086/128320. S2CID 120477301.
11. Wolf, M.; Zejda, M. (July 2005). "Apsidal motion in southern eccentric eclipsing binaries: V539 Ara, GG Lup, V526 Sgr and AO Vel". Astronomy and Astrophysics. 437 (2): 545–551. Bibcode:2005A&A...437..545W. doi:10.1051/0004-6361:20041868. S2CID 121307009.

v t e Constellation of Lupus
List of stars in Lupus Lupus in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ ι κ κ λ μ ν ν ξ ξ ο π ρ σ τ τ υ φ φ χ ψ ψ ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 HR 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 142527 Other Gliese 588 HIP 70849 Lupus-TR-3 SAO 206462 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 NGC 5643
Category

• Spectroscopic binaries
• Algol variables
• Henry Draper Catalogue objects
• Hipparcos objects
• Objects with variable star designations
• B-type main-sequence stars
• Bright Star Catalogue objects
• Lupus (constellation)