astro.wikisort.org - StarHD 164595 is a G-type star located in the constellation of Hercules, 28.28 parsecs (92.2 light-years) from Earth that is notably similar to the Sun. With an apparent magnitude of 7.075, the star can be found with binoculars or a small telescope in the constellation Hercules.
G-type star located in the constellation of Hercules
HD 164595
 Position of star HD 164595 in the constellation Hercules |
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Hercules |
Right ascension |
18h 00m 38.895s[1] |
Declination |
+29° 34′ 18.92″[1] |
Apparent magnitude (V) |
7.08[2] |
Characteristics |
Spectral type |
G2V[3] |
Astrometry |
---|
|
---|
Proper motion (μ) | RA: −139.130 mas/yr Dec.: 173.475 mas/yr |
Parallax (π) | 35.3642 ± 0.0258 mas[1] |
Distance | 92.23 ± 0.07 ly (28.28 ± 0.02 pc) |
Absolute magnitude (MV) | +4.81[4] |
|
Details |
---|
|
---|
Mass | 0.99[5] M☉ |
Radius | 1.02[1] R☉ |
Luminosity | 1.041[1] L☉ |
Surface gravity (log g) | 4.44 ± 0.05[5] cgs |
Temperature | 5790 ± 40[5] K |
Metallicity [Fe/H] | −0.06[5] dex |
Age | 4.5[5] Gyr |
|
Other designations |
---|
HD 164595, HIP 88194, SAO 85632, BD+29 3165, 2MASS J18003890+2934188, TYC 2103-1620-1. |
Database references |
---|
SIMBAD | data |
The star has the same stellar classification as the Sun: G2V. It has a similar temperature, at 5790 K compared with 5778 K for the Sun. It has a lower logarithm of metallicity ratio, at −0.06 compared with 0.00, and a slightly younger age, at 4.5 versus 4.6 billion years.[5][6][lower-alpha 1]
Planetary system
HD 164595 has one known planet, HD 164595 b, which orbits HD 164595 every 40 days.[8][9] It was detected with the radial velocity technique with the SOPHIE echelle spectrograph. The planet has a minimal mass equivalent of 16 Earths.[8]
The planetary system[10]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
b |
>0.0516±0.00856 MJ |
0.23 |
40.00±0.24 |
0.088+0.12 −0.066 |
— |
— |
Signal observation and SETI
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)[11] was observed in the direction of HD 164595 by a team led by N. N. Bursov[12] involving 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.[13][14] It was observed only once (for two seconds), by a single team, at a single telescope, giving it a Rio Scale[15] score of 1 (insignificant) or 2 (low). Discussions in the media from 29 August 2016 onwards featured speculation that the signal could be caused by an isotropic beacon from a Type II civilization.[16]
The senior astronomer of the SETI Institute, Seth Shostak, stated that confirmation by another telescope is required.[17] Astronomer 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.[11]
SETI and METI studies followed with the Allen Telescope Array and the Boquete Optical SETI Observatory.[18][17] Also, scientists at Berkeley SETI Research Center at the 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.[19][20]
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".[21]
See also
- Arecibo message, a three-minute-long message sent into space
- HD 162826
- Tabby's Star (KIC 8462852)
- Wow! signal, possible alien radio signal
- An exact solar twin would be a G2V star with a 5778 K temperature, be 4.6 billion years old, with the correct metallicity and a 0.1% solar luminosity variation.[7][6]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Epps, E. A. (1972). "UBV photoelectric observations: I. Stars within 25 parsec of the sun; II. Stars in quasar and galaxy fields; III. Stars in Kapteyn Selected Areas; IV. Miscellaneous stars". Royal Observatory Bulletin. 176: 127. Bibcode:1972RGOB..176..127E.
- 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: 507. Bibcode:1970AJ.....75..507H. doi:10.1086/110986.
- 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.
- Porto de Mello, G. F.; da Silva, R.; da Silva, L.; de Nader, R. V. (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.
- Williams, D. R. (2004). "Sun Fact Sheet". NASA. Retrieved 23 June 2009.
- "Solar Variability and Terrestrial Climate - NASA Science". NASA. Retrieved 8 January 2013.
- "HD 164595 b Confirmed Planet Overview Page". NASA. Retrieved 31 August 2016.
- Courcol, Bastien; Bouchy, François; Pepe, Francesco; Santerne, Alexandre; Delfosse, Xavier; Arnold, Luc; Astudillo-Defru, Nicola; Boisse, Isabelle; Bonfils, Xavier (1 September 2015). "The SOPHIE search for northern extrasolar planets". Astronomy & Astrophysics. 581. arXiv:1506.07144. Bibcode:2015A&A...581A..38C. doi:10.1051/0004-6361/201526329. ISSN 0004-6361.
- HD 164595 b on exoplanet.eu
- Berger, Eric (29 August 2016). "Ars Technica". 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.; Filippova, L.; Filippov, V.; Gindilis, L.; Maccone, C.; 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. 29 August 2016. 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.
- "They're not saying it's aliens, but signal traced to sunlike star sparks SETI interest". GeekWire. 29 August 2016.
- "'Leaked' space signal report has SETI groups scrambling". SFGate. 29 August 2016.
- "Preliminary analysis of star HD 164595" (PDF). University of Berkeley.
- "Breakthrough Listen Follow-up of a Transient Signal from the RATAN-600 Telescope in the Direction of HD 164595" (PDF). University of Berkeley.
- "SETI". Sternberg Astronomical Institute.
|
---|
Events and objects | |
---|
Signals of interest | Misidentified |
- CP 1919 (misidentified pulsar)
- CTA-102 (misidentified quasar)
|
---|
Stars | |
---|
Other |
- SHGb02+14a (radio source)
- Wow! signal (inconclusive)
- Fast radio burst (unknown origin)
- BLC1 (radio signal)
|
---|
|
---|
Life in the Universe |
- Earliest known life forms
- Habitability of Enceladus
- Habitability of Europa
- Habitability of Mars
- Habitability of Titan
- Habitability of Venus
|
---|
Planetary habitability | |
---|
Space missions |
- Beagle 2
- Biological Oxidant and Life Detection
- BioSentinel
- Curiosity rover
- Darwin
- Dragonfly
- Enceladus Explorer
- Enceladus Life Finder
- Europa Clipper
- ExoMars
- ExoLance
- EXPOSE
- Foton-M3
- Icebreaker Life
- Journey to Enceladus and Titan
- Laplace-P
- Life Investigation For Enceladus
- Living Interplanetary Flight Experiment
- Mars Geyser Hopper
- Mars sample-return mission
- Mars 2020
- Northern Light
- Opportunity rover
- SpaceX Red Dragon
- Spirit rover
- Tanpopo
- Titan Mare Explorer
- Venus In Situ Explorer
- Viking 1
- Viking 2
|
---|
Interstellar communication |
- Active SETI
- Allen Telescope Array
- Arecibo message
- Arecibo Observatory
- Berkeley SETI Research Center
- Bracewell probe
- Breakthrough Initiatives
- Breakthrough Listen
- Breakthrough Message
- Communication with extraterrestrial intelligence
- Gauss's Pythagorean right triangle proposal
- Astrolinguistics
- Lincos language
- NIROSETI
- Pioneer plaque
- Project Cyclops
- Project Ozma
- Project Phoenix
- SERENDIP
- Search for extraterrestrial intelligence
- SETI@home
- setiQuest
- Voyager Golden Record
- Water hole
- Xenolinguistics
|
---|
Exhibitions | |
---|
Hypotheses |
- Aestivation hypothesis
- Ancient astronauts
- Cosmic pluralism
- Directed panspermia
- Drake equation
- Extraterrestrial hypothesis
- Fermi paradox
- Great Filter
- Hypothetical types of biochemistry
- Interplanetary contamination
- Kardashev scale
- Mediocrity principle
- Neocatastrophism
- Panspermia
- Planetarium hypothesis
- Rare Earth hypothesis
- Zoo hypothesis
|
---|
Related topics |
- Astrobiology
- Astroecology
- Biosignature
- Brookings Report
- Planetary protection
- Potential cultural impact of extraterrestrial contact
- Post-detection policy
- Exotheology
- Extraterrestrials in fiction
- Extremophile
- MERMOZ
- Nexus for Exoplanet System Science
- Noogenesis
- San Marino Scale
- Technosignature
- UFO religion
- Xenoarchaeology
|
---|
Radio astronomy |
---|
Concepts |
- Units (watt and jansky)
- Radio telescope (Radio window)
- Astronomical interferometer (History)
- Very Long Baseline Interferometry (VLBI)
- Astronomical radio source
|
---|
Radio telescopes (List) | Individual telescopes | |
---|
Interferometers |
- Allen Telescope Array (ATA, California, US)
- Atacama Large Millimeter Array (ALMA, Chile)
- Australia Telescope Compact Array (ATCA, Australia)
- Australian Square Kilometre Array Pathfinder (ASKAP, Australia)
- Canadian Hydrogen Intensity Mapping Experiment (CHIME, Canada)
- Combined Array for Research in Millimeter-wave Astronomy (CARMA, California, US)
- European VLBI Network (Europe)
- Event Horizon Telescope (EHT)
- Giant Metrewave Radio Telescope (GMRT, India)
- Green Bank Interferometer (GBI, West Virginia, US)
- Korean VLBI Network (KVN, South Korea)
- Large Latin American Millimeter Array (LLAMA, Argentina/Brazil)
- Long Wavelength Array (LWA, New Mexico, US)
- Low-Frequency Array (LOFAR, Netherlands)
- MeerKAT (South Africa)
- Molonglo Observatory Synthesis Telescope (MOST, Australia)
- Multi-Element Radio Linked Interferometer Network (MERLIN, UK)
- Murchison Widefield Array (MWA, Australia)
- Northern Cross Radio Telescope (Italy)
- Northern Extended Millimeter Array (France)
- One-Mile Telescope (UK)
- Primeval Structure Telescope (PaST, China)
- Square Kilometre Array (SKA, Australia, South Africa)
- Submillimeter Array (SMA, US)
- Very Large Array (VLA, New Mexico, US)
- Very Long Baseline Array (VLBA, US)
- Westerbork Synthesis Radio Telescope (WSRT, Netherlands)
|
---|
Space-based | |
---|
|
---|
Observatories | |
---|
Multi-use |
- DRAO (Canada)
- ESA New Norcia (Australia)
- PARL (Canada)
|
---|
People | |
---|
Astronomy by EM methods |
- Submillimetre astronomy
- Infrared astronomy
- Optical astronomy
- High-energy astronomy
- Gravitational-wave astronomy
|
---|
Related articles |
- Aperture synthesis
- Cosmic microwave background radiation
- Interferometry
- Odd radio circle
- Pulsar timing array
- Radio propagation
- SETI
- Solar radio emission
|
---|
|
Constellation of Hercules |
---|
|
Stars | |
---|
|
|
|
Galaxies | |
---|
|
|
 Category |
На других языках
- [en] HD 164595
[ru] HD 164595
HD 164595 — одиночная звезда в созвездии Геркулеса. Находится на расстоянии 28,927 парсека (около 94,4 световых года) от Солнца[1].
Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.
Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
2019-2025
WikiSort.org - проект по пересортировке и дополнению контента Википедии