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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
Star in the constellation of Hercules
HD 164595 is a wide binary star [12] constellation of Hercules .[1] exoplanet . The system is located at a distance of 92 light years from the Sun based on parallax measurements,[2] radial velocity of 2.0 km/s.[6] absolute magnitude of +4.81,[1] apparent visual magnitude of 7.07.[1] Xi Herculis .[13] proper motion , traversing the celestial sphere at an angular rate of yr −1 .[14]
The spectrum of the primary, component A, presents as a G-type main-sequence star with a stellar classification of G2 V.[4] solar twin candidate,[15] [16] metallicity ratio, at −0.06 compared with 0.00, and a slightly younger age, at 4.5 versus 4.6 billion years .[9] [17] [a] magnetic activity in the chromosphere is comparable to solar levels.[15]
The secondary member, component B, is a magnitude 12.5[3] projected separation of ± 27 AU [12] red dwarf of spectral class M2.5 V.[5] light curve of this star suggest a rotation period of 43.5 days.[10]
Planetary system [ edit ]
HD 164595 has one known exoplanet, HD 164595 b [19] [20] radial velocity technique with the SOPHIE echelle spectrograph . Since the inclination of the orbital plane is unknown, only a lower bound on the mass of the object can be determined. The exoplanet has a minimal mass equivalent of 16 Earths .[19]
Signal observation and SETI [ edit ]
In 2016, HD 164595 briefly attracted media attention after it was reported that a possible SETI signal had been detected from the direction of the star in the previous year. The signal was only heard once and never confirmed by other telescopes, and is thought to have been due to terrestrial interference.
On 15 May 2015, a brief, single radio signal at 11 GHz (2.7 cm wavelength)[22] [23] Claudio Maccone at the RATAN-600 radio observatory. The signal may have been caused by terrestrial radio-frequency interference or gravitational lensing from a more distant source.[24] [25] Rio Scale [26] isotropic beacon from a Type II civilization .[27]
The senior astronomer of the SETI Institute , Seth Shostak , stated that confirmation by another telescope is required.[28] Nicholas Suntzeff of Texas A&M University stated that the signal is in a military frequency band, and that it could have been a satellite downlink, implying that some such systems may be kept secret and therefore would be unknown to SETI scientists.[22]
SETI and METI studies followed with the Allen Telescope Array and the Boquete Optical SETI Observatory.[29] [28] University of California, Berkeley observed HD 164595 using the Green Bank Telescope as part of the Breakthrough Listen program. No signal was detected at the position and frequency of the transient reported by the RATAN group.[30] [31]
The Special Astrophysical Observatory of the Russian Academy of Sciences has since released an official statement that the signal is of a "most probable terrestrial origin".[32]
See also [ edit ]
^ An exact solar twin would be a G2V star with a K solar luminosity variation.[18] [17]
References [ edit ]
^ a b c d e 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 .
^ a b c d e Mann, Andrew W.; et al. (May 2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal . 804 (1 ): 38. arXiv :1501.01635 Bibcode :2015ApJ...804...64M . doi :10.1088/0004-637X/804/1/64 . S2CID 19269312 . 64.
^ a b Harlan, E. A.; Taylor, D. C. (1970). "Erratum: MK classifications for F- and G-type stars. II [Astron. J., Vol. 75, p. 165 - 166 (1970)]". The Astronomical Journal . 75 Bibcode :1970AJ.....75..507H . doi :10.1086/110986 .
^ a b Alonso-Floriano, F. J.; et al. (May 2015). "CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS". Astronomy & Astrophysics . 577 : 19. arXiv :1502.07580 Bibcode :2015A&A...577A.128A . doi :10.1051/0004-6361/201525803 . S2CID 53135130 . A128.
^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics . 616 : A7. arXiv :1804.09370 Bibcode :2018A&A...616A...7S . doi :10.1051/0004-6361/201832795 . S2CID 52952408 .
^ a b Kervella, Pierre; et al. (March 2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly", Astronomy & Astrophysics , 623 : 23, arXiv :1811.08902 Bibcode :2019A&A...623A..72K , doi :10.1051/0004-6361/201834371 , S2CID 119491061 , A72.
^ a b Brewer, John M.; et al. (26 August 2016). "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars" . The Astrophysical Journal Supplement Series . 225 (2 ): 32. arXiv :1606.07929 Bibcode :2016ApJS..225...32B . doi :10.3847/0067-0049/225/2/32 ISSN 0067-0049 . S2CID 118507965 .
^ a b c d e Porto de Mello, G. F.; et al. (March 2014). "A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun". Astronomy and Astrophysics . 563 : A52. arXiv :1312.7571 Bibcode :2014A&A...563A..52P . doi :10.1051/0004-6361/201322277 . S2CID 119111150 .
^ a b Hartman, J. D.; et al. (May 2011). "A Photometric Variability Survey of Field K and M Dwarf Stars with HATNet". The Astronomical Journal . 141 (5 ): 166. arXiv :0907.2924 Bibcode :2011AJ....141..166H . doi :10.1088/0004-6256/141/5/166 . 166.
^ "HD 164595" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 28 December 2023 .
^ a b Montes, D.; et al. (September 2018). "Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K-primaries - I: High-resolution spectroscopy with HERMES: stellar parameters, abundances, and kinematics" . Monthly Notices of the Royal Astronomical Society . 479 (1 ): 1332–1382. arXiv :1805.05394 Bibcode :2018MNRAS.479.1332M . doi :10.1093/mnras/sty1295 S2CID 119260219 .
^ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas . Vol. 3. Sky Publishing Corporation and the European Space Agency. p. 1177. ISBN 0-933346-84-0
^ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal . 129 (3 ): 1483–1522. arXiv :astro-ph/0412070 Bibcode :2005AJ....129.1483L . doi :10.1086/427854 . S2CID 2603568 .
^ a b Porto de Mello, G. F.; et al. (March 2014). "A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun". Astronomy and Astrophysics . 563 : A52. arXiv :1312.7571 Bibcode :2014A&A...563A..52P . doi :10.1051/0004-6361/201322277 . S2CID 119111150 .
^ Mahdi, D.; et al. (March 2016). "Solar twins in the ELODIE archive". Astronomy & Astrophysics . 587 : A131. arXiv :1601.01599 Bibcode :2016A&A...587A.131M . doi :10.1051/0004-6361/201527472 . S2CID 119205608 .
^ a b Williams, D. R. (2004). "Sun Fact Sheet" . NASA . Retrieved 23 June 2009 .
^ "Solar Variability and Terrestrial Climate - NASA Science" . NASA . Retrieved 8 January 2013 .
^ a b "HD 164595 b Confirmed Planet Overview Page" . NASA . Retrieved 31 August 2016 .
^ Courcol, Bastien; et al. (1 September 2015). "The SOPHIE search for northern extrasolar planets". Astronomy & Astrophysics . 581 : A38. arXiv :1506.07144 Bibcode :2015A&A...581A..38C . doi :10.1051/0004-6361/201526329 . ISSN 0004-6361 . S2CID 119181352 .
^ HD 164595 b on exoplanet.eu
^ a b Berger, Eric (29 August 2016). "Ars Technica" . Ars Technica . Retrieved 29 August 2016 .
^ Gilster, Paul (27 August 2016). "An Interesting SETI Candidate in Hercules" . Centauri Dreams . Retrieved 29 August 2016 .
^ Bursov, N.; et al. (2016). "SETI observations on the RATAN-600 telescope in 2015 and detection of a strong signal in the direction of HD 164595". IAA SETI Permanent Committee . Guadalajara, Mexico.
^ "Mystery radio signal may be from distant star system — or a military transmitter" . KurzweilAI . Retrieved 31 August 2016 .
^ "Rio scale calculator" . AV Sport . Archived from the original on 2 September 2016. Retrieved 29 August 2016 .
^ Seemangal, Robin (29 August 2016). "Not a Drill: SETI Is Investigating a Possible Extraterrestrial Signal From Deep Space" . Observer . Retrieved 29 August 2016 .
^ a b "They're not saying it's aliens, but signal traced to sunlike star sparks SETI interest" . GeekWire . 29 August 2016. Retrieved 29 December 2023 .
^ " . SFGate . 29 August 2016. Retrieved 29 December 2023 .
^ "Preliminary analysis of star HD 164595" (PDF) . University of Berkeley . Retrieved 29 December 2023 .
^ Croft, Steve; et al. "Breakthrough Listen Follow-up of a Transient Signal from the RATAN-600 Telescope in the Direction of HD 164595" (PDF) . University of Berkeley . Retrieved 29 December 2023 .
^ "Monitoring of the continuum of SETI candidates with RATAN-600 (SAO RAS official comment)" . Sternberg Astronomical Institute . Retrieved 29 December 2023 .
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=HD_164595&oldid=1235165058 " C a t e g o r i e s : ● G - t y p e m a i n - s e q u e n c e s t a r s ● M - t y p e m a i n - s e q u e n c e s t a r s ● S o l a r a n a l o g s ● P l a n e t a r y s y s t e m s w i t h o n e c o n f i r m e d p l a n e t ● B i n a r y s t a r s ● H e r c u l e s ( c o n s t e l l a t i o n ) ● D u r c h m u s t e r u n g o b j e c t s ● H e n r y D r a p e r C a t a l o g u e o b j e c t s ● H i p p a r c o s o b j e c t s ● 2 M A S S o b j e c t s ● S e a r c h f o r e x t r a t e r r e s t r i a l i n t e l l i g e n c e ● 2 0 1 6 i n s c i e n c e H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a ● U s e d m y d a t e s f r o m A u g u s t 2 0 1 6
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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 . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
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