The planet Tau Ceti e orbits close to the inner edge of the habitable zone. The exact size and position of this conjectured object have not been determined, though it is at most 5 Jupiter masses if it orbits between 3 and 20 AU. Greaves noted at the time of her research that "it is likely that [any planets] will experience constant bombardment from asteroids of the kind believed to have wiped out the dinosaurs". Tau Ceti n [edit | edit source] Tau Ceti n is the outermost planet of the Tau Ceti system. , The debris disk was discovered by measuring the amount of radiation emitted by the system in the far infrared portion of the spectrum.  She chose Tau Ceti for a final shortlist of just five stars suitable for searches by the (indefinitely postponed) Terrestrial Planet Finder telescope system, commenting that "these are places I'd want to live if God were to put our planet around another star". Observations have detected more than ten times as much dust surrounding Tau Ceti as is present in the Solar System. This makes it one of the closest star systems to the Sun and the next-closest spectral class-G star after Alpha Centauri A. , It can be seen with the unaided eye with an apparent magnitude of 3.5. (University of Hertfordshire) The best current measurements of the properties of τ Ceti give it an effective surface temperature of 5,344 K, a radius 0.79 times that of the Sun, a luminosity of 0.52 times and a mass estimated to be 0.78 times. Tau Ceti is a Binary or Multiple star system. Like our sun Tau Ceti is a G-type main sequence star. Pada jarak kurang dari 12 tahun cahaya (3,7 parsec) dari Tata Surya, bintang ini relatif dekat dan bintang kelas G terdekat yang soliter.  Because of its debris disk, any planet orbiting Tau Ceti would face far more impact events than Earth.  A terrestrial planet would need to orbit this star at a distance of about 0.7 AU to match the solar insolation level of Earth. The luminosity of Tau Ceti is equal to only 55% of the Sun's luminosity. The disk forms a symmetric feature that is centered on the star, and its outer radius averages 55 AU.  As seen from Tau Ceti, the Sun would be in the northern hemisphere constellation Boötes with an apparent magnitude of about 2.6. For a typical G8 star, the rotation velocity is about 2.5 km/s.  Its possible properties were refined in 2017: it orbits at a distance of 0.552 AU (between the orbits of Venus and Mercury in the Solar System) with an orbital period of 168 days and has a minimum mass of 3.93 Earth masses.  If Tau Ceti e possesses an Earth-like atmosphere, the surface temperature would be around 68 °C (154 °F). Using the most recent figures given by the 2007 Hipparcos data, the star is 11.91 light years away from us. In the night sky Tau Ceti is visible to the naked eye.  Tau Ceti's belt is only 1/20 as dense as the belt around its young neighbor, Epsilon Eridani. Nevertheless, some research places it within the star's habitable zone. (2014) speculated that the planet may lie outside the habitable zone and closer to a Venus-like world. If a planet is confirmed to be the cause of this signal, as of August 2020 it would be designated as Tau Ceti i in accordance with IAU exoplanet naming policies.  It has a mean galacto-centric distance of 9.7 kiloparsec (32000 ly) and an orbital eccentricity of 0.22.  This star, along with η Cet (Deneb Algenubi), θ Cet (Thanih Al Naamat), ζ Cet (Baten Kaitos), and υ Cet, were Al Naʽāmāt (النعامات), the Hen Ostriches.  The Planetary Habitability Laboratory has estimated that Tau Ceti f, which receives 28.5% as much starlight as Earth, would be within the star's habitable zone, albeit narrowly.. By comparing the spectrum to computed models of stellar evolution, the age, mass, radius and luminosity of Tau Ceti can be estimated. Elle serait située à une distance d'environ 12 années-lumière de la Terre dans constellation méridionale de la Baleine (Cetus en latin). Coordinates: 01h 44m 04.0829s, −15° 56′ 14.928″. Artist's concept of the potentially habitable planet candidate Tau Ceti e, which was detected in December 2012 and lies 11.9 light-years from Earth. Two of them — tau Ceti e and f — are located on the inner and outer edges of the habitable zone, respectively. Its discovery was announced in … If it possesses an Earth-like atmosphere, the surface temperature would be around 70°C (343 K). If Tau Ceti e possesses an Earth-like atmosphere, the surface temperature would be around 68 °C (154 °F). Thus younger stars tend to have a higher portion of heavy elements in their atmospheres than do the older stars. Based upon the incident flux upon the planet, a study by Güdel et al. A logarithm of the relative iron abundance is compared to the Sun. In 2002, astronomers Margaret Turnbull and Jill Tarter developed the Catalog of Nearby Habitable Systems (HabCat) under the auspices of Project Phoenix, another SETI endeavour. In the case of Tau Ceti, the parallax measurements indicate a distance of 11.9 ly. The OP said that Tau Ceti e has a radius 1.6 times that of Earth. Tau Ceti a par exemple fait l'objet de nombreuses études dans le cadre du programme SETI de recherche de vie extraterrestre. However, it orbits on the hot inner edge of its host star’s habitable zone. Unlike proper motion, a star's radial velocity cannot be directly observed, but can be determined by measuring its spectrum.  The amount of metallicity in a star is given in terms of the ratio of iron (Fe), an easily observed heavy element, to hydrogen. Tau Ceti je s velkou pravděpodobností osamocená hvězda. 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