 Artist's impression of Kepler-452b (center), depicted here as a rocky planet in the habitable zone with extensive cloud cover. The actual appearance and composition of the exoplanet is unknown. | |
| Discovery | |
|---|---|
| Discovered by | Kepler Science team |
| Discovery site | Kepler |
| Discovery date | 23 July 2015 (announced) |
| Transit | |
| Designations | |
| KOI-7016.01 b | |
| Orbital characteristics | |
| 1.046+0.019 −0.015[1] AU | |
| 384.843+0.007 −0.012[1] d | |
| Inclination | 89.806+0.134 −0.049 |
| Star | Kepler-452 |
| Physical characteristics | |
| 1.5+0.32 −0.22[1] R🜨 | |
| Mass | 5 ± 2[2] ME |
| 1.9+1.5 −1.0 (est.) g[3] | |
| Temperature | Teq: 265K+15 −13 (265 K (−8 °C; 17 °F))[1] |
Kepler-452b (sometimes quoted to be an Earth 2.0 or Earth's Cousin[4][5] based on its characteristics; also known by its Kepler object of interest designation KOI-7016.01) is a super-Earth exoplanet orbiting within the inner edge of the habitable zone of the sun-like star Kepler-452 and is the only planet in the system discovered by the Kepler space telescope. It is located about 1,400 light-years (430 pc)[6] from Earth in the constellation of Cygnus.
Kepler-452b orbits its star at a distance of 1.04 AU (156 million km; 97 million mi) from its host star (nearly the same distance as Earth from the Sun), with an orbital period of roughly 385 days, has a mass at least five times that of Earth, and has a radius of around 1.5 times that of Earth. It is the first potentially rocky super-Earth[6] planet discovered orbiting within the habitable zone of a very Sun-like star.[7] However, it is unknown if it is entirely habitable, as it is receiving slightly more energy from its star than Earth and could be subjected to a runaway greenhouse effect.
The Kepler space telescope identified the exoplanet, and its discovery was announced by NASA on 23 July 2015.[8] The planet is about 1,800 light-years (550 pc) away from the Solar System. At the speed of the New Horizons spacecraft, at about 59,000 km/h (16,000 m/s; 37,000 mph), it would take approximately 30 million years to get there.[9]
- ^ a b c d "NASA Exoplanet Archive – Confirmed Planet Overview – Kepler-452b". NASA Exoplanet Archive. 2009. Archived from the original on 24 July 2015. Retrieved 23 July 2008.
- ^ "NASA's Kepler Mission Discovers Bigger, Older Cousin to Earth". National Aeronautics and Space Administration. 23 July 2015. Archived from the original on 15 August 2015. Retrieved 10 June 2016.
- ^ Cite error: The named reference
Feltmanwas invoked but never defined (see the help page). - ^ Rincon, Paul (23 July 2015). "'Earth 2.0' found in Nasa Kepler telescope haul". BBC News. Archived from the original on 19 July 2020. Retrieved 24 July 2015.
- ^ "Kepler-452b: How long would it take humans to reach 'Earth 2' and could we live there?". Archived from the original on 5 May 2016. Retrieved 9 January 2016.
- ^ a b "The Habitable Exoplanets Catalog – Planetary Habitability Laboratory @ UPR Arecibo". upr.edu. Archived from the original on 11 February 2018. Retrieved 23 July 2015.
- ^ Chou, Felicia; Johnson, Michele (23 July 2015). "NASA's Kepler Mission Discovers Bigger, Older Cousin to Earth" (Press release). NASA. Archived from the original on 7 October 2015. Retrieved 23 July 2015.
- ^ Jenkins, Jon M.; Twicken, Joseph D.; Batalha, Natalie M.; et al. (23 July 2015). "Discovery and Validation of Kepler-452b: A 1.6 R🜨 Super Earth Exoplanet in the Habitable Zone of a G2 Star" (PDF). The Astronomical Journal. 150 (2): 56. arXiv:1507.06723. Bibcode:2015AJ....150...56J. doi:10.1088/0004-6256/150/2/56. ISSN 1538-3881. S2CID 26447864. Archived (PDF) from the original on 5 July 2016. Retrieved 24 July 2015.
- ^ "NASA telescope discovers Earth-like planet in star's 'habitable zone". BNO News. 23 July 2015. Archived from the original on 4 March 2016. Retrieved 23 July 2015.