Kepler-69c

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Kepler-69c[1][2][3]
Exoplanet List of exoplanets
Kepler-69 and the Solar System.jpg
Artist's impression of the Kepler-69 system (sizes to scale) compared to the planets of the inner Solar System with their respective habitable zones.
Parent star
Star Kepler-69 (KIC=8692861)[4][5][6][7][8][9][10] [11]
Constellation Cygnus[12]
Right ascension (α) 19h 33m 02.622s[4]
Declination (δ) +44° 52′ 08.00″[4]
Apparent magnitude (mV) 13.7[1]
Distance 2700;[13] 1040.0[10] ly
(830 pc)
Spectral type G4V[8]
Mass (m) 0.98;[10] null[5] M☉
Radius (r) 0.900;[4] 0.655; 0.69[5] R☉
Temperature (T) 5603;[5] 5886[4] K
Metallicity [Fe/H] −0.540; null[5]
Age 0.400[4] Gyr
Physical characteristics
Radius (r) 1.71+0.34
−0.23[1] R⊕
Stellar flux (F⊙) 1.91 (+0.43
−0.56)[14] ⊕
Temperature (T) 281;[4] 299[1]
Orbital elements
Semi-major axis (a) 0.64+0.15
−0.11[4][5] AU
Eccentricity (e) 0.14+0.18
−0.1[4][5]
Orbital period (P) 242.4613+0.0059
−0.0064[1][4][5] d
Inclination (i) 89.85+0.03
−0.08[4][5]°
Time of transit (Tt) 150.867[4][5] JD
Discovery information
Discovery date 17 April 2013
Discoverer(s) Barclay et al.
Discovery method Transit (Kepler Mission Method)
Discovery site Kepler Space Observatory
Discovery status Conference announcement
Other designations
KOI-172.02
Database references
Extrasolar Planets
Encyclopaedia		 data
SIMBAD data
Exoplanet Archive data
Open Exoplanet Catalogue data

Kepler-69c[1][2][3] (also known by its Kepler Object of Interest designation KOI-172.02)[5][10] is a confirmed super-Earth extrasolar planet, about 70% larger than Earth, orbiting a Sun-like G-type star, Kepler-69, located about 2,700 ly (830 pc) from Earth in the constellation of Cygnus. The planet was discovered by NASA's Kepler spacecraft using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. Kepler-69c is most likely a terrestrial planet. Initial discovery of the planet was announced on January 7, 2013;[7][8] confirmation was announced on April 18, 2013. Although it was initially thought to be in the habitable zone,[15] it is now thought to represent a super-Venus, analogous to Venus but more massive, and thus highly unlikely to be habitable for life as we know it.[11]

Confirmed exoplanet

Kepler-69c, a super-Earth, has a radius 1.7 times that of Earth. The planet orbits a Sun-like star, named Kepler-69, once every 242.5 days.[5]

Comparison of the sizes of the planets Kepler-69c, Kepler-62e, Kepler-62f, and the Earth. (All planets except the Earth are artists' conceptions.)

Habitability

The planet was announced in the media as being located within the star's "habitable zone", a region where liquid water could exist on the surface of the planet. It was described as being one of the most Earth-like planets, in terms of size and temperature yet found and, according to the scientists, a "prime candidate to host alien life".[8] Due to uncertainties in the stellar parameters, the error bars on the value of the incident flux on this planet are quite large, at 1.91+0.43
−0.56 times the level of Earth. Using the nominal parameters, the planet is too close to the star to be habitable, though the uncertainties allow for the possibility that it may actually lie in the innermost region of the habitable zone.[16] A more recent analysis has shown that the planet is likely more analogous to Venus, which is known to be one of the most inhospitable places to life as we know it in the Solar System, and thus unlikely to be habitable to such organisms.[11]

The Kepler Space Telescope search volume, in the context of the Milky Way Galaxy

Host star and star system

The host star, Kepler-69 (KIC 8692861, 2MASS J19330262+4452080),[5] is a G-type main-sequence star somewhat cooler than the Sun.[8] On April 18, 2013, it was announced that two planets orbit Kepler-69: an inner planet, Kepler-69b, and an outer planet, Kepler-69c.[1][2][3] Kepler-69c is about 70 million miles from its host star (compared to 93 million miles between Earth and the Sun) and takes 242 days to orbit its star (compared to the 365 days of Earth).[8]


See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ 10.0 10.1 10.2 10.3 Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ 11.0 11.1 11.2 Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  15. ↑ 3 Potentially Habitable 'Super-Earths' Explained (Infographic)
  16. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

Coordinates: Sky map 19h 33m 02.622s, +44° 52′ 08.00″

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