Exoplanet | List of exoplanets | |
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Parent star | ||
Star | Kepler-452 | |
Constellation | Cygnus | |
Right ascension | (α) | 19h 44m 00.89s[1] |
Declination | (δ) | +44° 16′ 39.2″[1] |
Distance | 1400 ly (430 pc) |
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Spectral type | G2[1][2] | |
Mass | (m) | 1.037+0.054 −0.047[1] M☉ |
Radius | (r) | 1.11+0.15 −0.09[1] R☉ |
Temperature | (T) | 5757±85[1] K |
Metallicity | [Fe/H] | 0.21±0.09[1] |
Age | 6±2[1] Gyr | |
Physical characteristics | ||
Mass | (m) | 5 ± 2 (predicted) M⊕ |
Radius | (r) | 1.63+0.23 −0.20[1] R⊕ (10.4+1.5 −1.3 Mm) |
Stellar flux | (F⊙) | ~1.10 ⊕ |
Density | (ρ) | 6.4+6.8 −3.8 (predicted) g cm−3 |
Surface gravity | (g) | 18.5+15.1 −10.0 (predicted) m/s² (1.9+1.5 −1.0 g) |
Temperature | (T) | 265+15 −13 K[1] (−8+15 −13 °C, 17.6+27 −23.4 °F) |
Discovery information | ||
Discovery date | 23 July 2015 (announced) | |
Discoverer(s) | Kepler Science Team | |
Discovery method | Transit | |
Discovery site | Kepler | |
Discovery status | Published | |
Orbital elements | ||
Semi-major axis | (a) | 1.046+0.019 −0.015[1] AU |
Orbital period | (P) | around 384.843+0.007 −0.012[1] d |
Inclination | (i) | 89.806+0.134 −0.049° |
Other designations | ||
KOI-7016.01[3]
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Database references | ||
Extrasolar Planets Encyclopaedia |
data | |
SIMBAD | data | |
Exoplanet Archive | data | |
Open Exoplanet Catalogue | data |
Kepler-452b is an exoplanet orbiting the G-class star Kepler-452. It was identified by the Kepler space telescope, and its discovery was publicly announced by NASA on 23 July 2015.[2] It is the first potentially rocky super-Earth[4] planet discovered orbiting within the habitable zone of a star very similar to the Sun.[5] Using the criteria of the Earth Similarity Index, it is the sixth-most Earth-like exoplanet known to date.
The planet is about 1,400 light-years away from the Solar System; at the speed of the New Horizons spacecraft, about 59,000 km/h (37,000 mph), it would take approximately 26 million years to get there.[6]
Properties
The planet takes 385 Earth days to orbit its star.[7] It is 60% bigger than Earth, and lies within the conservative habitable zone of its parent star.[8][9]
It has a probable mass five times that of Earth, and its surface gravity is twice Earth's, though calculations of mass for exoplanets are only rough estimates.[8] If it is a terrestrial planet, it is most likely a super-Earth with many active volcanoes due to its higher mass and density. The clouds on the planet would be thick and misty, covering much of the surface as viewed from space. From the surface, its star Kepler-452 would look almost identical to the Sun as viewed from the Earth.[10]
It is not known if Kepler-452b is a rocky planet or a small gas planet,[11] but based on its small radius, Kepler-452b has a reasonable chance of being rocky.[2] It is not clear if Kepler-452b offers habitable environments. It orbits a G2V-type star, like the Sun, with nearly the same temperature and mass and 20% more luminous.[7] However, the star is six billion years old, making it 1.5 billion years older than the Sun. At this point in its star's evolution, Kepler-452b is receiving 10% more energy from its parent star than Earth is currently receiving from the Sun.[5] If Kepler-452b is a rocky planet, it may be subject to a runaway greenhouse effect similar to that seen on Venus.[12]
Notable Exoplanets – Kepler Space Telescope |
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Name | ESI | SPH | HZD | HZC | HZA | pClass | hClass | Distance (ly) | Status | Year of discovery |
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Earth | 1.00 | 0.72 | −0.50 | −0.31 | −0.52 | warm terran | mesoplanet | 0 | — | — |
Kepler-452b[13][14] | 0.83 | 0.93 | −0.61 | -0.15 | -0.30 | warm superterran | mesoplanet | 1402.5 | confirmed | 2015 |
Gallery
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See also
References
- ^ a b c d e f g h i j k l "NASA Exoplanet Archive – Confirmed Planet Overview – Kepler-452b". NASA Exoplanet Archive. 2015. Retrieved 23 July 2015.
- ^ a b c Jenkins, Jon M.; Twicken, Joseph D.; Batalha, Natalie M.; Caldwell, Douglas A.; Cochran, William D.; Endl, Michael; Latham, David W.; Esquerdo, Gilbert A.; Seader, Shawn; Bieryla, Allyson; Petigura, Erik; Ciardi, David R.; Marcy, Geoffrey W.; Isaacson, Howard; Huber, Daniel; Rowe, Jason F.; Torres, Guillermo; Bryson, Stephen T.; Buchhave, Lars; Ramirez, Ivan; Wolfgang, Angie; Li, Jie; Campbell, Jennifer R.; Tenenbaum, Peter; Sanderfer, Dwight; Henze, Christopher E.; Catanzarite, Joseph H.; Gilliland, Ronald L.; Borucki, William J. (23 July 2015). "Discovery and Validation of Kepler-452b: A 1.6 R⨁ Super Earth Exoplanet in the Habitable Zone of a G2 Star". The Astronomical Journal 150 (2): 56. doi:10.1088/0004-6256/150/2/56. ISSN 1538-3881. Retrieved 24 July 2015.
- ^ Johnson, Michele (23 July 2015). "Twelve New Small Kepler Habitable Zone Candidates". NASA. Retrieved 24 July 2015.
- ^ "The Habitable Exoplanets Catalog – Planetary Habitability Laboratory @ UPR Arecibo". upr.edu.
- ^ a b Chou, Felicia; Johnson, Michele (23 July 2015). "NASA’s Kepler Mission Discovers Bigger, Older Cousin to Earth" (Press release). NASA. Retrieved 23 July 2015.
- ^ "NASA telescope discovers Earth-like planet in star’s ‘habitable zone". BNO News. 23 July 2015. Retrieved 23 July 2015.
- ^ a b Overbye, Dennis (23 July 2015). "Kepler Data Reveals What Might Be Best ‘Goldilocks’ Planet Yet". The New York Times. Retrieved 23 July 2015.
- ^ a b Feltman, Rachel (23 July 2015). "Scientists discover 12 new potential Earth-like planets". The Washington Post. Retrieved 23 July 2015.
- ^ Witze, Alexandra (23 July 2015). "NASA spies Earth-sized exoplanet orbiting Sun-like star". Nature. Retrieved 23 July 2015.
- ^ NASA Kepler press conference. 23 July 2015.
- ^ Rincon, Paul (23 July 2015). "'Earth 2.0' found in Nasa Kepler telescope haul". BBC News. Retrieved 24 July 2015.
- ^ Lugmayr, Luigi (23 July 2015). "Kepler-452b details unveiled". I4U News. Retrieved 23 July 2015.
- ^ Pelmorex Inc. "News – Astronomers host live Q&A about 'Earth 2.0'. Watch it here – The Weather Network". The Weather Network.
- ^ "No, Kepler-452b is not the most Earth-like planet found so far". cnnhit.com.
External links
- NASA – Kepler Mission
- NASA – Kepler Discoveries – Summary Table
- Habitable Exolanets Catalog at UPR-Arecibo.
- Discovery and Validation of Kepler-452b: A 1.6 R⨁ Super Earth Exoplanet in the Habitable Zone of a G2 Star
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