|
Exoplanet Name : |
GJ 436 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.3800 |
(Rjup) |
4.2594 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0700 |
(Mjup) |
22.2557 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0289 |
(AU) |
0.0289 |
(AU Est.) |
|
Eccentricity : |
0.1912 |
|
Orbital Period(Yrs) |
0.0072 |
|
Orbital Period(Observed/Estimated) |
2.64 |
(Days Obs.) |
2.66 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.2267 |
|
Star Radiation at Atmospheric Boundary: |
58348.0 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
693.7 |
(K) |
|
Blackbody T 0.3(K) |
651.4 |
(K) |
|
Blackbody T 0.7(K) |
527.1 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
824.9 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
774.7 |
(K) |
|
Size Class: |
Neptune-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Radial Velocity |
|
Radius Detection : |
Primary Transit |
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
GJ 436 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
33.3 |
|
Stellar Radius(Rsun) : |
0.5 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.5 |
(Msun Measured) |
0.5 |
(Msun Estimated) |
|
Star Age : |
6.0 |
(GY) |
|
Temperature : |
3684 |
(K) |
|
Spectral type : |
M2.5 |
|
UV portion[%]: |
0.2 |
|
Visible portion[%]: |
10.1 |
|
IR portion[%]: |
89.7 |
|
Metalicity : |
-0.3 |
|
Absolute Magnitude: |
10.6 |
|
Apparent Magnitude: |
10.7 |
|
Right Ascension(RA) |
175.5462 |
|
Declination (DEC) |
26.7064 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
"Jeffrey L. Coughlin, Guy S. Stringfellow, Andrew C. Becker, Mercedes Lopez-Morales, Fabio Mezzalira, Tom Krajci" |
|
Discovery Paper - Title |
New Observations and a Possible Detection of Parameter Variations in the Transits of Gliese 436b |
|
Discovery Paper - Journal |
DOI:10.1086/595822 |
|
Discovery Paper - URL |
https://arxiv.org/abs/0809.1664 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+436&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/Gliese%20436%20b/ |
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GJ 436 b
GJ 436 b
GJ 436 b is an exoplanet orbiting the star GJ 436, located about 33.3 light-years (10.2 pc) away from Solar System. Its discovery was publicly announced on 2004.
The host star GJ 436 has apparent magnitude of 10.7, with absolute magnitude of 10.6. It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3684 with its spectral types of M2.5
In this planetary system, the extrasolar planet GJ 436 b orbits around the star GJ 436 every 2.6 days with its orbital distance of 0.03 AU ( 4318890.5 km)
(Projected orbit of GJ 436 b around its host star GJ 436)
The Star GJ 436 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.136 AU ( 20408699.7 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.189 AU ( 28210156.5 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.287 AU ( 42986035.6 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.423 AU ( 63255834.4 km)
Radiation at Planetary Boundary of GJ 436 b : 58347.96 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 436)
Kopparapu Recent Venus for Star GJ 436 distance : 0.154 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 436 distance : 0.195 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 436 distance : 0.188 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 436 distance : 0.207 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 436 distance : 0.375 AU
Kopparapu Outer Boundary for Early Mars for Star GJ 436 distance : 0.396 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 436)
Original Kopparapu Recent Venus for Star GJ 436 distance : 0.152 AU
Original Kopparapu Runaway Greenhouse for Star GJ 436 distance : 0.201 AU
Original Kopparapu Moist Greenhouse for Star GJ 436 distance : 0.201 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 436 distance : 0.381 AU
Original Kopparapu Outer Boundary for Early Mars for Star GJ 436 distance : 0.396 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 436)
(Position in Stellar Map of star GJ 436 and its Exoplanet GJ 436 b)
(Zoomed position in Stellar Map of star GJ 436 and its Exoplanet GJ 436 b (zoom level 3))
(Synthetic Spectrum of star GJ 436*)
*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
