FY 1214 b

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Exoplanet
GJ 1214 b

Size comparison with Earth and Neptune

Size comparison with Earth and Neptune
Constellation Snake bearer
Position
equinox : J2000.0
Right ascension 17h 15m 18.934s
declination + 04 ° 57 ′ 50.065 ″
Orbit data
Central star FY 1214
Major semi-axis 0.014 AU
eccentricity <0.27
Period of circulation 1.5804 days
Further data
radius (2.85 ± 0.20) R ⊕
Dimensions (6.26 ± 0.86) M ⊕
distance (42.75 ± 0.12) ly
(14.47 ± 0.04) pc
history
discovery MEarth Project , David Charbonneau, et al.
Date of discovery 2009
Catalog names
FY 1214 b

GJ 1214 b , also Gliese 1214 b , is an extrasolar super-earth discovered in 2009 . When it was discovered by Zachory Berta , it was the most Earth-like known exoplanet. It is almost 50 light years away from Earth and in 38 hours orbits the red dwarf GJ 1214 in the constellation Snake Bearer , whose radiation is 200 times weaker than that of the sun . The distance to its central star is about 0.014 AU (about 2 million km). Its mass corresponds to almost 7 Earth masses , its radius is estimated to be a little more than two and a half earth radii .

There is clear evidence that GJ 1214 b is surrounded by a relatively thick atmosphere . The equilibrium temperature of the exoplanet depends on several factors, some of which are only inaccurately known or not known at all. Estimates suggest an equilibrium temperature between 120 and 280 ° C. This is based on an albedo of 0.75 (at 120 ° C) or 0 (at 282 ° C).

Observations from the Hubble telescope have shown that the atmosphere of GJ 1214 b may be composed primarily of water vapor . It is therefore believed that a large part of the planet itself is made up of water . That would make it a so-called ocean planet .

swell

Web links

Commons : GJ 1214 b  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b G 139-21. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 7, 2018 .
  2. ↑ a b c GJ 1214 b. In: Extrasolar Planets Encyclopaedia . Retrieved December 7, 2018 .
  3. ↑ a b GJ 1214 b. In: NASA Exoplanet Archive . Retrieved December 7, 2018 .
  4. ↑ The MEarth Project: Searching for Habitable Exoplanets around Nearby Small Stars ( Memento of the original from April 13, 2012 on WebCite ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .  @1@ 2Template: Webachiv / IABot / www.cfa.harvard.eduOn: cfa.harvard.edu ("MEarth" project page in English), accessed on May 16, 2014.
  5. ↑ Florian Freistetter: The moist super earth from GJ1214 . On: scienceblogs.de of December 17, 2009, last accessed on September 9, 2013.
  6. ↑ Charbonneau et al .: A super Earth transiting a nearby low-mass star. In: Nature. December 17, 2009, No. 462, pp. 891-894, doi: 10.1038 / nature08679 , arxiv : 0912.3229 .
  7. ↑ Stefan Deiters: GJ 1214B An exoplanet like no other . On: astronews.com of February 21, 2012, last accessed on September 9, 2013.
  8. ^ Zachory K. Berta, David Charbonneau, Jean-Michel Désert et al .: The Flat Transmission Spectrum of the Super-Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope. On: Astrophysics> Earth and Planetary Astrophysics. arxiv : 1111.5621 .
  9. ↑ Jonathan D. Fraine, Drake Deming, Michaël Gillon et al .: Spitzer Transits of the Super-Earth GJ1214b and Implications for its Atmosphere. In: The Astrophysical Journal . (ApJ) 2013, Vol. 765, No. 2, Article No. 127, doi: 10.1088 / 0004-637X / 765/2/127 .