Exoplanet | List of exoplanets | |
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Parent star | ||
Star | Kepler-438 | |
Constellation | Lyra[2] | |
Right ascension | (α) | 18h 46m 35.000s |
Declination | (δ) | +41° 57′ 3.93″ |
Apparent magnitude | (mV) | 14.467 |
Distance | 470;[2] 475[1] ly (145 pc) |
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Mass | (m) | 0.540 M☉ |
Radius | (r) | 0.520 R☉ |
Temperature | (T) | 3748 K |
Metallicity | [Fe/H] | 0.160 |
Age | +0.8 −0.7 4.4[3] Gyr |
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Physical characteristics | ||
Radius | (r) | 1.120 R⊕ |
Stellar flux | (F⊙) | 1.38 ⊕ |
Temperature | (T) | 273–333 K (0–60 °C; 32–140 °F) |
Orbital elements | ||
Semi-major axis | (a) | 0.16600 AU |
Eccentricity | (e) | +0.01 −0.03 0.03[3] |
Orbital period | (P) | 35.23319000 d |
Inclination | (i) | 89.860° |
Discovery information | ||
Discovery date | 2015[4] | |
Discoverer(s) | ||
Discovery method | Transit | |
Discovery site | Kepler Space Observatory | |
Discovery status | Published refereed article | |
Other designations | ||
KOI-3284.01; Kepler-438 b; KOI-3284 b; K03284.01; WISE J184634.98+415704.0 b; KIC 6497146 b; 2MASS J18463499+4157039 b
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Database references | ||
Extrasolar Planets Encyclopaedia |
data | |
SIMBAD | data | |
Exoplanet Archive | data | |
Open Exoplanet Catalogue | data |
Kepler-438b (also known by its Kepler Object of Interest designation KOI-3284.01) is a confirmed near-Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the red dwarf[5] Kepler-438, about 470 light-years (145 pc) from Earth in the constellation Lyra.[1][2] 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. NASA announced the confirmation of the exoplanet on 6 January 2015.[1] It is the most Earth-like exoplanet known to date.[6]
Confirmed exoplanet
Kepler-438b is a near-Earth-sized exoplanet with a radius 1.12 times that of Earth. The planet orbits the red dwarf[5] Kepler-438, a star considerably smaller and cooler than the Sun, once every 35.2 days.[1][2]
Habitability
The planet was announced as being located within the habitable zone of Kepler-438, 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, having an ESI (Earth Similarity Index) of 0.88.[1][2]
Notable Exoplanets – Kepler Space Telescope |
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(Kepler-62e, Kepler-62f, Kepler-186f, Kepler-296e, Kepler-296f, Kepler-438b, Kepler-440b, Kepler-442b) (Kepler Space Telescope; 6 January 2015).[1] |
See also
References
- ^ a b c d e f g Clavin, Whitney; Chou, Felicia; Johnson, Michele (6 January 2015). "NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones". NASA. Retrieved 6 January 2015.
- ^ a b c d e f Sample, Ian (7 January 2015). "Kepler 438b: Most Earth-like planet ever discovered could be home for alien life". The Guardian. Retrieved 7 January 2015.
- ^ a b c Torres, Guillermo; Kipping, David M.; Fressin, Francois; Caldwell, Douglas A.; Twicken, Joseph D.; Ballard, Sarah; Batalha, Natalie M.; Bryson, Stephen T.; Ciardi, David R.; Henze, Christopher E.; Howell, Steve B.; Isaacson, Howard T.; Jenkins, Jon M.; Muirhead, Philip S.; Newton, Elisabeth R.; Petigura, Erik A.; Barclay, Thomas; Borucki, William J.; Crepp, Justin R.; Everett, Mark E.; Horch, Elliott P.; Howard, Andrew W.; Kolbl, Rea; Marcy, Geoffrey W.; McCauliff, Sean; Quintana, Elisa V. (2015). "Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone". arXiv:1501.01101 [astro-ph.EP].
- ^ Staff (2015). "Planet Kepler-438 b". The Extrasolar Planets Encyclopaedia. Retrieved 11 January 2015.
- ^ a b Gilster, Paul (6 January 2015). "AAS: 8 New Planets in Habitable Zone". Centauri-dreams.org. Retrieved 9 January 2015.
- ^ "10 Real Planets That Are Stranger Than Science Fiction". Retrieved 2015-06-13.
External links
- NASA – Kepler Mission.
- NASA – Kepler Discoveries – Summary Table.
- NASA – Kepler-438b at The NASA Exoplanet Archive.
- NASA – Kepler-438b at The Extrasolar Planets Encyclopaedia.
- Habitable Exolanets Catalog at UPR-Arecibo.
Preceded by Gliese 667 Cc |
Highest ESI 2015 — present |
Succeeded by none |
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