File:Mega-earth.jpg
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[edit]DescriptionMega-earth.jpg |
English: A mega-Earth is a proposed neologism for a massive terrestrial exoplanet that is at least ten times the mass of Earth. Mega-Earths would be substantially more massive than super-Earths (terrestrial and ocean planets with masses around 5–10 Earths). The term "mega-Earth" was coined in 2014, when Kepler-10c was revealed to be a Neptune-mass planet with a density considerably greater than that of Earth, though it has since been determined to be a typical volatile-rich planet weighing just under half that mass.K2-56b, also designated BD+20594b, is a much more likely mega-Earth, with about 16 Earth's mass and 2.2 Earth's radius. At the time of its discovery in 2016, it had the highest chance of being rocky for a planet its size, with a posterior probability that it is dense enough to be terrestrial at about 0.43. For comparison, at the time the corresponding probability for Kepler-10c was calculated as 0.1, and as 0.002 for Kepler-131b.Kepler-145b is one of the most massive planets classified as mega-Earths, with a mass of 37.1 Earth's mass and a radius of 2.65 Earth's radius, so large that it could belong to a sub-category of mega-Earths known as supermassive terrestrial planets (SMTP). It likely has an Earth-like composition of rock and iron without any volatiles. A similar mega-Earth, K2-66b, has a mass of about 21.3 ME and a radius of about 2.49 RE, and orbits a subgiant star. Its composition appears to be mainly rock with a small iron core and a relatively thin steam atmosphere.Kepler-277b and Kepler-277c are a pair of planets orbiting the same star, both thought to be mega-Earths with masses of about 87.4 ME and 64.2 ME, and radii of about 2.92 RE and 3.36 RE, respectively. |
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Source | Own work |
Author | Pablo Carlos Budassi |
Planet concept illustrated especially for Wikimedia Commons by Pablo Carlos Budassi. Source: https://www.pablocarlosbudassi.com/2021/02/planet-types.html Background image by ESO/Serge Brunier: https://commons.wikimedia.org/wiki/File:ESO_-_Milky_Way.jpg Suggestions for improving this image are welcome: pablocarlosbudassi@gmail.com
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current | 15:46, 15 August 2023 | 1,080 × 1,080 (461 KB) | Celestialobjects (talk | contribs) | Uploaded own work with UploadWizard |
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Author | Pablo Carlos Budassi |
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Copyright holder |
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Headline | Artist's impression of a mega-Earth |
Credit/Provider | Created by artist Pablo Carlos Budassi in 2023 (@pablocarlosbudassi) |
Source | https://pablocarlosbudassi.com |
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Date and time of data generation | 26 March 2021 |
Width | 1,080 px |
Height | 1,080 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS6 (Macintosh) |
File change date and time | 08:44, 12 August 2023 |
Exif version | 2.21 |
Color space | sRGB |
Date metadata was last modified | 05:44, 12 August 2023 |
Date and time of digitizing | 09:09, 30 May 2008 |
Unique ID of original document | xmp.did:0080117407206811B65FEE6CD4839DCA |
Type of item | 13000000 science and technology |
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Contact information | pablocarlosbudassi@gmail.com
www.pablocarlosbudassi.com https://www.pablocarlosbudassi.com/2021/02/planet-types.html Provincia del Chaco 2925 P.A. Mendoza, Mendoza, M5502 Argentina |