HD 165590

HD 165590
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	18h 05m 49.681s
Declination	+21° 26′ 45.38″
Apparent magnitude (V)	6.94
Characteristics
HD 165590A
Evolutionary stage	main sequence
Spectral type	G1V+K6V [1]
Apparent magnitude (g)	7.28[2]
HD 165590B
Evolutionary stage	main sequence
Spectral type	G5V[1]
Astrometry
ADS 11060AB
Proper motion (μ)	RA: −3.9±0.5 mas/yr[3] ; Dec.: −51.4±0.7 mas/yr[3]
Parallax (π)	26.51 ± 1.35 mas[4]
Distance	123 ± 6 ly ; (38 ± 2 pc)
ADS 11060C
Proper motion (μ)	RA: −27.515±0.014 mas/yr ; Dec.: −39.93±0.02 mas/yr
Parallax (π)	24.6940 ± 0.0225 mas[5]
Distance	132.1 ± 0.1 ly ; (40.50 ± 0.04 pc)
Details[1]
HD 165590A
Mass	1.09±0.19 + 0.63±0.15 M☉
Radius	0.90 + 0.58 R☉
Surface gravity (log g)	4.56 + 4.71 cgs
Temperature	5,915+4,055 K
Metallicity [Fe/H]	−0.13 dex
Age	100 Myr
HD 165590B
Radius	0.91±0.09 R☉
Temperature	5,590±300 K
Age	100 Myr
Other designations
	ADS 11060, CSI+21 3302 1, GSC 01566-00747, HIP 88637, 2MASS J18054972+2126453, BD+21 3302, SBC9 1024, V772 Her, Gaia DR2 4576326312901654272
	HD 165590A: TYC 1566-747-1, SBC9 1023, CSI+21 3302 6, ADS 11060A
	HD 165590B: TYC 1566-747-2, CSI+21 3302 7, ADS 11060B
Database references
SIMBAD	data

HD 165590 is a quintuple system dominated by the binary Algol variable star known as V772 Herculi. The system lies in the constellation of Hercules about 123±6 light years from the Sun, and is suspected to be a part of the Pleiades moving group.[4]

System

The primary star is an eclipsing binary ADS 11060A composed of G1 and K6 young main-sequence stars with strong starspot activity.[1] A radio ﬂare from the star V772 Her was detected in 2011.[6] The period of the components of the primary, ADS 11060Aa and ADS 11060Ab, is 0.87950 days.[4]

A main-sequence companion star ADS 11060B of spectral type G5 at a separation of 0.491 arcseconds,[7] is orbiting the primary with a period of 20.08 years.[4]

Also, there is a suspected companion binary star ADS 11060C (Gaia EDR3 4576326312901650560)[5] at a projected separation of 29 arcseconds (1200 AU) from ADS 11060AB. ADS 11060C is composed of K7 and M0 main-sequence stars, orbiting each other with a period of 25.7631 days without eclipses. The binary is a BY Draconis variable.[8]

The planetary orbits in the habitable zones in the system ADS 11060AB are unstable due to the gravitational influence of the stellar companions.[9]

References

Reglero, V.; Fernandez-Figuerora, M. J.; Gimenez, A.; De Castro, E.; Fabregat, J.; Cornide, M.; Armentia, J. E. (1991). "The triple system HD 165590 : a spectroscopic and photometric study". Astronomy and Astrophysics Supplement Series. 88: 545. Bibcode:1991A&AS...88..545R.
Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
"HD 165590". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.
Zasche, P.; Wolf, M.; Hartkopf, W. I.; Svoboda, P.; Uhlař, R.; Liakos, A.; Gazeas, K. (2009). "A Catalog of Visual Double and Multiple Stars with Eclipsing Components". The Astronomical Journal. 138 (2): 664–679. arXiv:0907.5172. Bibcode:2009AJ....138..664Z. doi:10.1088/0004-6256/138/2/664. S2CID 17089387.
Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
Polarization Observation Experiments for Radio Flares of Stars at the 6 cm Band
Tokovinin, A. A.; Ismailov, R. M. (1988). "Interferometric observations of double stars in 1985 and 1986". Astronomy and Astrophysics Supplement Series. 72: 563. Bibcode:1988A&AS...72..563T.
Fekel, Francis C.; Henry, Gregory W.; Hampton, Melissa L.; Fried, Robert; Morton, Mary D. (1994). "Chromospherically Active Stars. XII. ADS 11060 C: A Double Linked K Dwarf Binary in a Quintuple System". The Astronomical Journal. 108: 694. Bibcode:1994AJ....108..694F. doi:10.1086/117106.
Benest, D. (2003). "Planetary orbits in the elliptic restricted problem. V.". Astronomy & Astrophysics. 400 (3): 1103–1111. doi:10.1051/0004-6361:20030114.

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[Reglero1991-1] Reglero, V.; Fernandez-Figuerora, M. J.; Gimenez, A.; De Castro, E.; Fabregat, J.; Cornide, M.; Armentia, J. E. (1991). "The triple system HD 165590 : a spectroscopic and photometric study". Astronomy and Astrophysics Supplement Series. 88: 545. Bibcode:1991A&AS...88..545R.

[EDR3A-2] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.

[SIMBAD-3] "HD 165590". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.

[Zasche2009-4] Zasche, P.; Wolf, M.; Hartkopf, W. I.; Svoboda, P.; Uhlař, R.; Liakos, A.; Gazeas, K. (2009). "A Catalog of Visual Double and Multiple Stars with Eclipsing Components". The Astronomical Journal. 138 (2): 664–679. arXiv:0907.5172. Bibcode:2009AJ....138..664Z. doi:10.1088/0004-6256/138/2/664. S2CID 17089387.

[EDR3C-5] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.

[6] Polarization Observation Experiments for Radio Flares of Stars at the 6 cm Band

[7] Tokovinin, A. A.; Ismailov, R. M. (1988). "Interferometric observations of double stars in 1985 and 1986". Astronomy and Astrophysics Supplement Series. 72: 563. Bibcode:1988A&AS...72..563T.

[8] Fekel, Francis C.; Henry, Gregory W.; Hampton, Melissa L.; Fried, Robert; Morton, Mary D. (1994). "Chromospherically Active Stars. XII. ADS 11060 C: A Double Linked K Dwarf Binary in a Quintuple System". The Astronomical Journal. 108: 694. Bibcode:1994AJ....108..694F. doi:10.1086/117106.

[9] Benest, D. (2003). "Planetary orbits in the elliptic restricted problem. V.". Astronomy & Astrophysics. 400 (3): 1103–1111. doi:10.1051/0004-6361:20030114.