|
Exoplanet Name : |
Kepler-20 g |
|
Alternate Name : |
"2MASS J19104752+4220194 g, KIC 6850504 g, KOI-70 g, Kepler-20 A g, WISE J191047.52+422019.0 g" |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.2304 |
(Rjup) |
2.5831 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0628 |
(Mjup) |
19.9665 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.2055 |
(AU) |
0.2055 |
(AU Est.) |
|
Eccentricity : |
0.1500 |
|
Orbital Period(Yrs) |
0.0957 |
|
Orbital Period(Observed/Estimated) |
34.94 |
(Days Obs.) |
34.91 |
(Days Est.) |
|
Surface Gravity (G Earth) |
2.9924 |
|
Star Radiation at Atmospheric Boundary: |
21028.3 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
537.5 |
(K) |
|
Blackbody T 0.3(K) |
504.7 |
(K) |
|
Blackbody T 0.7(K) |
408.4 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
639.1 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
600.2 |
(K) |
|
Size Class: |
sub-Neptune-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Theoretical |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
Kepler-20 |
|
Alternate Name : |
"2MASS J19104752+4220194, KIC 6850504, KOI-70, Kepler-20 A, WISE J191047.52+422019.0" |
|
Star Distance(LY) : |
921.4 |
|
Stellar Radius(Rsun) : |
0.9 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.9 |
(Msun Measured) |
0.9 |
(Msun Estimated) |
|
Star Age : |
7.6 |
(GY) |
|
Temperature : |
5508 |
(K) |
|
Spectral type : |
G8 |
|
UV portion[%]: |
6.9 |
|
Visible portion[%]: |
43.3 |
|
IR portion[%]: |
49.8 |
|
Metalicity : |
0.1 |
|
Absolute Magnitude: |
5.2 |
|
Apparent Magnitude: |
12.5 |
|
Right Ascension(RA) |
287.6980 |
|
Declination (DEC) |
42.3387 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-20+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
|
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Kepler-20 g
Kepler-20 g
Kepler-20 g is an exoplanet orbiting the star Kepler-20, located about 921.4 light-years (282.5 pc) away from Solar System. Its discovery was publicly announced on 2016.
The host star Kepler-20 has apparent magnitude of 12.5, with absolute magnitude of 5.2. It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5508 with its spectral types of G8
In this planetary system, the extrasolar planet Kepler-20 g orbits around the star Kepler-20 every 34.9 days with its orbital distance of 0.21 AU ( 30742362.4 km)
(Projected orbit of Kepler-20 g around its host star Kepler-20)
The Star Kepler-20 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.583 AU ( 87210664.5 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.806 AU ( 120547929.2 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 1.228 AU ( 183688366.9 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 1.807 AU ( 270305478.7 km)
Radiation at Planetary Boundary of Kepler-20 g : 21028.30 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-20)
Kopparapu Recent Venus for Star Kepler-20 distance : 0.614 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-20 distance : 0.777 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-20 distance : 0.751 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-20 distance : 0.823 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.384 AU
Kopparapu Outer Boundary for Early Mars for Star Kepler-20 distance : 1.459 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-20)
Original Kopparapu Recent Venus for Star Kepler-20 distance : 0.612 AU
Original Kopparapu Runaway Greenhouse for Star Kepler-20 distance : 0.800 AU
Original Kopparapu Moist Greenhouse for Star Kepler-20 distance : 0.809 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.408 AU
Original Kopparapu Outer Boundary for Early Mars for Star Kepler-20 distance : 1.464 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-20)
(Position in Stellar Map of star Kepler-20 and its Exoplanet Kepler-20 g)
(Zoomed position in Stellar Map of star Kepler-20 and its Exoplanet Kepler-20 g (zoom level 3))
(Synthetic Spectrum of star Kepler-20*)
*Yamashiki YA et al. 2019 ApJ 881 114
MUSCLES Paper I - France et al. 2016 ApJ 820 89
MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102
