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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
HD 168009 is a star in the northern constellation of Lyra . It has an apparent visual magnitude of 6.3,[2] placing it just above to below the normal limit of stars visible to the naked eye under good viewing conditions of 6-6.5. An annual parallax shift of 42.93 mas provides a distance estimate of 76 light years . It is moving closer to the Sun with a heliocentric radial velocity of −65 km/s.[4] In about 328,000 years from now, the star will make its closest approach at a distance of around 17 ly (5.1 pc ).[10]
This is a solar analog ,[2] which means its measured properties are similar to those of the Sun. However, it is much older than the Sun with an estimated age of around 8.1 billion years.[4] The spectrum matches a stellar classification of G1 V,[3] indicating this is an ordinary G-type main-sequence star that is generating energy through hydrogen fusion at its core . The level of chromospheric activity is low, making it a candidate for a Maunder minimum event.[4]
HD 168009 has about the same mass as the Sun , but is 14% larger in radius.[6] It has a similar metallicity to the Sun – what astronomers term the abundance of elements other than hydrogen and helium – and is spinning with a rotation period of six days.[8] The star is radiating 1.43[7] times the Sun's luminosity from its photosphere at an effective temperature of 5,792 K.[4] It has been examined for an infrared excess that may indicate the presence of a circumstellar disk of dust, but no statistically significant excess was detected.[11] [12]
Planetary system [ edit ]
In 2020, a candidate exoplanet was detected orbiting this star. With a minimum mass of 0.03 M J (9.5 M E ) and an orbital period of 15 days, this would most likely be a hot mini-Neptune .[13] The planet existence was confirmed in 2021.[14]
References [ edit ]
^ a b Mahdi, D.; et al. (March 2016), "Solar twins in the ELODIE archive", Astronomy & Astrophysics , 587 : 9, arXiv :1601.01599 , Bibcode :2016A&A...587A.131M , doi :10.1051/0004-6361/201527472 , S2CID 119205608 , A131.
^ a b c d e f Lubin, Dan; et al. (March 2012), "Frequency of Maunder Minimum Events in Solar-type Stars Inferred from Activity and Metallicity Observations", The Astrophysical Journal Letters , 747 (2 ): 6, Bibcode :2012ApJ...747L..32L , doi :10.1088/2041-8205/747/2/L32 , L32.
^ a b Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan , 57 (1 ): 13–25, Bibcode :2005PASJ...57...13T , doi :10.1093/pasj/57.1.13 .
^ a b c Fuhrmann, Klaus (July 2011), "Nearby stars of the Galactic disc and halo - V", Monthly Notices of the Royal Astronomical Society , 414 (4 ): 2893−2922, Bibcode :2011MNRAS.414.2893F , doi :10.1111/j.1365-2966.2011.18476.x .
^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1 ): 343–357, arXiv :1208.2037 , Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x , S2CID 118665352 .
^ a b Hempelmann, A.; et al. (February 2016), "Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability", Astronomy & Astrophysics , 586 : 19, Bibcode :2016A&A...586A..14H , doi :10.1051/0004-6361/201526972 , A14.
^ "HD 168009" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-01-18 .
^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics , 575 : 13, arXiv :1412.3648 , Bibcode :2015A&A...575A..35B , doi :10.1051/0004-6361/201425221 , S2CID 59039482 , A35.
^ Sierchio, J. M.; et al. (April 2014), "The Decay of Debris Disks around Solar-type Stars", The Astrophysical Journal , 785 (1 ): 13, arXiv :1402.6308 , Bibcode :2014ApJ...785...33S , doi :10.1088/0004-637X/785/1/33 , S2CID 54077869 , 33.
^ Ballering, Nicholas P.; et al. (September 2013), "A Trend between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-orbit Planets", The Astrophysical Journal , 775 (1 ): 14, arXiv :1308.2223 , Bibcode :2013ApJ...775...55B , doi :10.1088/0004-637X/775/1/55 , S2CID 119113700 , 55.
^ a b Hirsch, Lea A.; et al. (December 2020), "Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc", The Astronomical Journal , 161 (3 ): 134, arXiv :2012.09190 , Bibcode :2021AJ....161..134H , doi :10.3847/1538-3881/abd639 , S2CID 229297873 .
^ a b Rosenthal, Lee J.; et al. (2021), "The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades", The Astrophysical Journal Supplement Series , 255 (1 ): 8, arXiv :2105.11583 , Bibcode :2021ApJS..255....8R , doi :10.3847/1538-4365/abe23c , S2CID 235186973
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=HD_168009&oldid=1187562014 "
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● L y r a
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● T h i s p a g e w a s l a s t e d i t e d o n 3 0 N o v e m b e r 2 0 2 3 , a t 0 0 : 5 7 ( U T C ) .
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a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n .
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