Exoplanet Name : |
Gliese 12 b |
Alternate Name : |
|
Status : |
Confirmed |
Radius (Rjup / Re): |
0.0919 |
(Rjup) |
1.0301 |
(Rearth) |
Mass (Mjup / Me): |
0.0049 |
(Mjup) |
1.5706 |
(Mearth) |
Semi Major Axis / Orbital Distance Calculated |
0.0660 |
(AU) |
0.0660 |
(AU Est.) |
Eccentricity : |
0.0000 |
Orbital Period(Yrs) |
0.0349 |
Orbital Period(Observed/Estimated) |
12.76 |
(Days Obs.) |
12.62 |
(Days Est.) |
Surface Gravity (G Earth) |
1.4801 |
Star Radiation at Atmospheric Boundary: |
2281.2 |
(W/m2) |
Measured Temperature (K) |
0.0 |
(K) |
Blackbody T 0.1(K) |
308.4 |
(K) |
Blackbody T 0.3(K) |
289.7 |
(K) |
Blackbody T 0.7(K) |
234.4 |
(K) |
Tidally Locked Blackbody T 0.1(K) |
366.8 |
(K) |
Tidally Locked Blackbody T 0.3(K) |
344.5 |
(K) |
Size Class: |
Earth-size |
Mass Class: |
|
Detection Type : |
Primary Transit |
Mass Detection : |
Radial Velocity |
Radius Detection : |
Primary Transit |
Habitability by Solar Eq. Astronomical Unit: |
Habitable |
Habitability by Kopparapu: |
Not habitable |
Star Name : |
Gliese 12 |
Alternate Name : |
|
Star Distance(LY) : |
39.7 |
Stellar Radius(Rsun) : |
0.3 |
(Rsun Measured) |
Stellar Mass(Msun) : |
0.2 |
(Msun Measured) |
0.2 |
(Msun Estimated) |
Star Age : |
7.0 |
(GY) |
Temperature : |
3253 |
(K) |
Spectral type : |
M3.5V |
UV portion[%]: |
0.3 |
Visible portion[%]: |
7.6 |
IR portion[%]: |
92.0 |
Metalicity : |
-0.3 |
Absolute Magnitude: |
12.2 |
Apparent Magnitude: |
12.6 |
Right Ascension(RA) |
3.9550 |
Declination (DEC) |
13.5562 |
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
Discovered by |
|
Discovery Paper - Authors |
|
Discovery Paper - Title |
|
Discovery Paper - Journal |
|
Discovery Paper - URL |
|
SIMBAD LINK |
|
Open Exoplanet Database Link |
|
![](Gliese_12_b_CSun.png) |
![](Gliese_12_b_CJup.png) |
![](Gliese_12_b_CNep.png) |
![](Gliese_12_b_CEar.png) |
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Gliese 12 b
Gliese 12 b
Gliese 12 b is an exoplanet orbiting the star Gliese 12, located about 39.7 light-years (12.2 pc) away from Solar System. Its discovery was publicly announced on 2024.
The host star Gliese 12 has apparent magnitude of 12.6, with absolute magnitude of 12.2. It is 0.2 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3253 with its spectral types of M3.5V
In this planetary system, the extrasolar planet Gliese 12 b orbits around the star Gliese 12 every 12.8 days with its orbital distance of 0.07 AU ( 9873459.5 km)
(Projected orbit of Gliese 12 b around its host star Gliese 12)
![](Gliese_12_b_Orb.png)
The Star Gliese 12 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.062 AU ( 9225258.0 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.085 AU ( 12751717.4 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.130 AU ( 19430795.3 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.191 AU ( 28593266.5 km)
Radiation at Planetary Boundary of Gliese 12 b : 2281.17 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Gliese 12)
![](Gliese_12_b_OrbH.png)
Kopparapu Recent Venus for Star Gliese 12 distance : 0.070 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star Gliese 12 distance : 0.088 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Gliese 12 distance : 0.085 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star Gliese 12 distance : 0.094 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star Gliese 12 distance : 0.174 AU
Kopparapu Outer Boundary for Early Mars for Star Gliese 12 distance : 0.184 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star Gliese 12)
![](Gliese_12_b_OrbK.png)
Original Kopparapu Recent Venus for Star Gliese 12 distance : 0.069 AU
Original Kopparapu Runaway Greenhouse for Star Gliese 12 distance : 0.092 AU
Original Kopparapu Moist Greenhouse for Star Gliese 12 distance : 0.092 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Gliese 12 distance : 0.177 AU
Original Kopparapu Outer Boundary for Early Mars for Star Gliese 12 distance : 0.184 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star Gliese 12)
![](Gliese_12_b_OrbKO.png)
(Position in Stellar Map of star Gliese 12 and its Exoplanet Gliese 12 b)
![](Gliese_12_b_STZ0.png)
(Zoomed position in Stellar Map of star Gliese 12 and its Exoplanet Gliese 12 b (zoom level 3))
![](Gliese_12_b_STZ3.png)
(Synthetic Spectrum of star Gliese 12*)
![](Gliese_12_b_Spc.png)
*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