Astronomy:KOI-4878.01

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Short description: Unconfirmed potentially habitable extrasolar planet
KOI-4878.01
PlanetaSH(4).jpg
Artist's impression of KOI-4878.01
Discovery
Discovery siteKepler Space Observatory
Discovery date2015
Transit
Orbital characteristics
1.125 AU (168,300,000 km)
Orbital period449.015±0.021 d
StarKOI-4878
Physical characteristics
Mean radius1.05 R⊕
Physics−16.5 °C (256.6 K; 2.3 °F)


KOI-4878.01 is an exoplanet candidate that orbits the G-type main-sequence star KOI-4878. It is located about 1075 light years (329 parsecs) from Earth.[1][2][3] The features of the planet are very similar to that of Earth, and if it is confirmed, it would be one of the most Earth-like planets found.[4] The orbital period of the exoplanet is around 449 Earth days. It is very likely located within the habitable zone of its parent star.[5][6]

Host star

Its host star is a G-type main-sequence star that is slightly less massive than the Sun, although it is about 5% larger and has a temperature of about 5780 K. The star is a V magnitude 12.4 star in the constellation Draco. Despite the unknown age of the star, its low metallicity and fairly high space velocity suggest that KOI-4878 is older than the Sun.[7][8]

Exoplanet detection

An analysis of Kepler's data from its first to the twelve quarter revealed three possible transit events equally spaced in time. A post-analysis in the Sixteen quarter showed that the events happened within a period of 449 days, they had a duration of 12 and half hours and a transit depth of 94 ppm.[9]

Characteristics

Mass

KOI-4878.01's mass is somewhere between 1.4 - 3.0 Earth masses; likely about 1.9 Earth masses.[10][11]

Radius

The exoplanet has a slightly larger radius than Earth: 1.05 Earth radii.[12]

Temperature

It has an equilibrium temperature of 256 K (-16.5 °C; 2.3 °F), an average surface temperature of about 2.4 degrees C (4.3 degrees F) cooler than Earth, but it may have more greenhouse gases than Earth to trap heat. [13]

Properties of KOI-4878.01[14]
Property Based on KIC data Based on new data
Period (days) 449.015±0.021 449.015±0.021
Semimajor Axis (AU) 1.137 +0.053/-0.040 1.125
Planet Radius (Earth=1) 1.04 +0.38/-0.14 1.05
Seff (Earth=1) 1.05 0.92

Habitability

The estimated features of the planet are similar to an Earth analog.[15] It completes an orbit around its host star every 449 Earth days. Based on this, KOI-4878.01 should be in the habitable zone of the star.[16][17]

In literature

KOI-4878.01 appears in Tras el cielo de Urano, a novel written by Antonio José López Serrano. The convoy from Earth - destined to conquer the exoplanet KOI-4878-01 in the constellation of the Swan - suffers a spectacular accident while orbiting the planet Uranus. Captain Íñigo Cortés, one of the survivors of the expedition, takes the reins of his ship to guide the rest of the colonists, who are not resigned to returning to Earth.[18]

See also

References

  1. ↑ Rowe, Jason F. (2015). "Planetary candidates observed by kepler v: planet sample from q1-q12 (36 months)". The Astrophysical Journal Supplement Series 217 (1): 16. doi:10.1088/0067-0049/217/1/16. Bibcode: 2015ApJS..217...16R. 
  2. ↑ "KOI-4878.01". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI-4878.01&type=KEPLER_CANDIDATE. 
  3. ↑ "KOI-4878.01". http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=KOI-4878.01&submit=SIMBAD+search. 
  4. ↑ "Open Exoplanet Catalogue - KOI-4878 b". http://www.openexoplanetcatalogue.com/planet/KOI-4878%20b/. 
  5. ↑ "Life away from Earth". El Faro del Saber - UNED Long-distance Learning University. https://qinnova.uned.es/archivos_publicos/qweb_paginas/3736/boletinfarodelsabernuevaepocan12016.pdf. 
  6. ↑ "KOI-4878.01: Kepler's Most Earth-like Planet Candidate?" (in en-US). 2019-09-05. https://www.drewexmachina.com/2019/09/05/koi-4878-01-keplers-most-earth-like-planet-candidate/. 
  7. ↑ "KOI-4878". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI-4878&type=KEPLER_TARGET. 
  8. ↑ Institute, CSIC. "Exoplanets in the Milky Way". http://digital.csic.es/bitstream/10261/125578/55/16-Exoplanetas.pdf. 
  9. ↑ "KOI-4878.01: Kepler's Most Earth-like Planet Candidate?" (in en-US). 2019-09-05. https://www.drewexmachina.com/2019/09/05/koi-4878-01-keplers-most-earth-like-planet-candidate/. 
  10. ↑ How the Universe Works: An Illustrated Guide to the Cosmos. Book Sales. 2017. ISBN 9780785835417. https://books.google.com/books?id=UNA1DwAAQBAJ&q=KOI4878&pg=PT76. 
  11. ↑ Institute, CSIC. "Exoplanets in the Milky Way". http://digital.csic.es/bitstream/10261/125578/55/16-Exoplanetas.pdf. 
  12. ↑ "La NASA ha encontrado siete exoplanetas similares a la Tierra en los que buscar vida" (in es). 2017-02-22. https://www.huffingtonpost.es/2017/02/22/nasa-exoplanetas_n_14932404.html. 
  13. ↑ "KOI-4878.01". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI-4878.01. 
  14. ↑ "KOI-4878.01: Kepler's Most Earth-like Planet Candidate?" (in en-US). 2019-09-05. https://www.drewexmachina.com/2019/09/05/koi-4878-01-keplers-most-earth-like-planet-candidate/. 
  15. ↑ Atargatis (2020-11-10). "Found more than 20 exoplanets that could host life" (in it-IT). https://atargatis.news/science/found-more-than-20-exoplanets-that-could-host-life/. 
  16. ↑ Mendez, Abel. Potentially habitable worlds. https://iopscience.iop.org/book/978-1-6817-4401-8/chapter/bk978-1-6817-4401-8ch5. 
  17. ↑ "Planetas habitables en los que nunca habitaremos" (in es). 2016-10-07. https://www.elindependiente.com/futuro/2016/10/07/planetas-habitables-habitaremos/. 
  18. ↑ "Tras el cielo de Urano" (in es). http://www.unoeditorial.com/portfolio/tras-el-cielo-de-urano/. 



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