Английская Википедия:Iota Draconis b

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Шаблон:Short description Шаблон:Infobox planet Iota Draconis b, formally named Hypatia (pronounced Шаблон:IPAc-en or Шаблон:IPAc-en), is an exoplanet orbiting the K-type giant star Iota Draconis about 101.2 light-years (31 parsecs, or nearly Шаблон:Val km) from Earth in the constellation Draco. The exoplanet was found by using the radial velocity method, from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star. It was the first planet discovered orbiting a giant star.[1]

Physical characteristics

Mass

Iota Draconis b is a "super-Jupiter", a planet that has mass larger than that of the gas giants Jupiter and Saturn. It has an estimated minimum mass of around 11.82 Шаблон:Jupiter mass.[2]

In 2021, astrometric observations revealed the true mass of Iota Draconis b to be 16.4 Шаблон:Jupiter mass.[2]

Host star

Шаблон:Main The planet orbits a (K-type) giant star named Edasich (designated Iota Draconis). The star has exhausted the hydrogen supply in its core and is currently fusing helium. The star has a mass of 1.82 Шаблон:Solar mass and a radius of around 12 Шаблон:Solar radius. It has a surface temperature of 4545 K and is around 800 million years old based on its evolution. Although much younger than the Sun, the higher mass of this star correlates to a faster evolution, leading to the host star having already departed from the main sequence. When on the main sequence, Edasich was probably a Class A star with surface temperature between 7,400 and 10,000K.[3] In comparison, the Sun is about 4.6 billion years old[4] and has a surface temperature of 5778 K.[5]

The star's apparent magnitude, a measure of how bright it appears from Earth, is 3.31. Therefore, Edasich can be seen with the naked eye.

Orbit

Iota Draconis b orbits its star with nearly 55 times the Sun's luminosity (55 Шаблон:Solar luminosity) every 511 days at an average distance of 1.275 AU (compared to Mars' orbital distance from the Sun, which is 1.52 AU) It has a very eccentric orbit, with an eccentricity of 0.7124.

Discovery

Discovered in 2002 during a radial velocity study of K-class giant stars, its eccentric orbit aided its detection, as giant stars have pulsations which can mimic the presence of a planet.[1]

Name

Following its discovery the planet was designated Iota Draconis b. In July 2014, the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[6] The process involved public nomination and voting for the new names.[7] In December 2015, the IAU announced that the winning name for this planet was Hypatia.[8] The winning name was submitted by Hypatia, a student society of the Physics Faculty of the Universidad Complutense de Madrid, Spain. Hypatia was a famous Greek astronomer, mathematician, and philosopher.[9]

References

Шаблон:Reflist

External links

Шаблон:Stars of Draco Шаблон:Sky

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  1. ↑ 1,0 1,1 Шаблон:Cite journal
  2. ↑ 2,0 2,1 Ошибка цитирования Неверный тег <ref>; для сносок Hill2021 не указан текст
  3. ↑ Шаблон:Cite journal
  4. ↑ Шаблон:Cite web
  5. ↑ Шаблон:Cite web
  6. ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
  7. ↑ Шаблон:Cite web
  8. ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
  9. ↑ Шаблон:Cite web
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