|
Exoplanet Name : |
GJ 422 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.1985 |
(Rjup) |
2.2254 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0328 |
(Mjup) |
10.4443 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.1110 |
(AU) |
0.1110 |
(AU Est.) |
|
Eccentricity : |
0.1000 |
|
Orbital Period(Yrs) |
0.0551 |
|
Orbital Period(Observed/Estimated) |
20.13 |
(Days Obs.) |
22.83 |
(Days Est.) |
|
Surface Gravity (G Earth) |
2.1089 |
|
Star Radiation at Atmospheric Boundary: |
1562.0 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
280.6 |
(K) |
|
Blackbody T 0.3(K) |
263.5 |
(K) |
|
Blackbody T 0.7(K) |
213.2 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
333.7 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
313.4 |
(K) |
|
Size Class: |
sub-Neptune-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Spectrum |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Habitable |
|
Habitability by Kopparapu: |
Habitable |
|
Star Name : |
GJ 422 |
|
Alternate Name : |
HIP 55042 |
|
Star Distance(LY) : |
41.7 |
|
Stellar Radius(Rsun) : |
0.4 |
(Rsun Estimated) |
|
Stellar Mass(Msun) : |
0.3 |
(Msun Measured) |
0.5 |
(Msun Estimated) |
|
Star Age : |
0.0 |
(GY) |
|
Temperature : |
3323 |
(K) |
|
Spectral type : |
M3.5V |
|
UV portion[%]: |
0.2 |
|
Visible portion[%]: |
12.4 |
|
IR portion[%]: |
87.4 |
|
Metalicity : |
0.0 |
|
Absolute Magnitude: |
11.0 |
|
Apparent Magnitude: |
11.5 |
|
Right Ascension(RA) |
169.0009 |
|
Declination (DEC) |
-56.4523 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
"Allard,rance; Hauschildt,eter.; Baraffe,sabelle; Chabrier,illes" |
|
Discovery Paper - Title |
Synthetic Spectra and Mass Determination of the Brown Dwarf GI 229B |
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+422+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/GJ%20422%20b/ |
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GJ 422 b
GJ 422 b
GJ 422 b is an exoplanet orbiting the star GJ 422, located about 41.7 light-years (12.8 pc) away from Solar System. Its discovery was publicly announced on 2014.
The host star GJ 422 has apparent magnitude of 11.5, with absolute magnitude of 11.0. It is 0.3 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3323 with its spectral types of M3.5V
In this planetary system, the extrasolar planet GJ 422 b orbits around the star GJ 422 every 20.1 days with its orbital distance of 0.11 AU ( 16605363.6 km)
(Projected orbit of GJ 422 b around its host star GJ 422)
The Star GJ 422 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.086 AU ( 12838618.6 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.119 AU ( 17746326.0 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.181 AU ( 27041473.5 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.266 AU ( 39792712.9 km)
Radiation at Planetary Boundary of GJ 422 b : 1561.99 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 422)
Kopparapu Recent Venus for Star GJ 422 distance : 0.097 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 422 distance : 0.123 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 422 distance : 0.119 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 422 distance : 0.131 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 422 distance : 0.241 AU
Kopparapu Outer Boundary for Early Mars for Star GJ 422 distance : 0.255 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 422)
Original Kopparapu Recent Venus for Star GJ 422 distance : 0.097 AU
Original Kopparapu Runaway Greenhouse for Star GJ 422 distance : 0.127 AU
Original Kopparapu Moist Greenhouse for Star GJ 422 distance : 0.128 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 422 distance : 0.245 AU
Original Kopparapu Outer Boundary for Early Mars for Star GJ 422 distance : 0.255 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 422)
(Position in Stellar Map of star GJ 422 and its Exoplanet GJ 422 b)
(Zoomed position in Stellar Map of star GJ 422 and its Exoplanet GJ 422 b (zoom level 3))
(Synthetic Spectrum of star GJ 422*)
*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
