|
Exoplanet Name : |
K2-238 b |
|
Alternate Name : |
"2MASS J23104905-0751270 b, EPIC 246067459 b, WISE J231049.06-075127.2 b" |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
1.3000 |
(Rjup) |
14.5717 |
(Rearth) |
|
Mass (Mjup / Me): |
0.8600 |
(Mjup) |
273.4267 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0460 |
(AU) |
0.0460 |
(AU Est.) |
|
Eccentricity : |
0.0000 |
|
Orbital Period(Yrs) |
0.0088 |
|
Orbital Period(Observed/Estimated) |
3.20 |
(Days Obs.) |
3.30 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.2877 |
|
Star Radiation at Atmospheric Boundary: |
1472031.1 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1554.6 |
(K) |
|
Blackbody T 0.3(K) |
1459.9 |
(K) |
|
Blackbody T 0.7(K) |
1181.2 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1848.8 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1736.2 |
(K) |
|
Size Class: |
Super-Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
Primary Transit |
|
Mass Detection : |
|
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
K2-238 |
|
Alternate Name : |
"2MASS J23104905-0751270, EPIC 246067459, WISE J231049.06-075127.2" |
|
Star Distance(LY) : |
111316.0 |
|
Stellar Radius(Rsun) : |
1.6 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.2 |
(Msun Measured) |
1.3 |
(Msun Estimated) |
|
Star Age : |
5.6 |
(GY) |
|
Temperature : |
5630 |
(K) |
|
Spectral type : |
G2 V |
|
UV portion[%]: |
7.4 |
|
Visible portion[%]: |
44.0 |
|
IR portion[%]: |
48.6 |
|
Metalicity : |
0.3 |
|
Absolute Magnitude: |
-3.9 |
|
Apparent Magnitude: |
13.8 |
|
Right Ascension(RA) |
347.7043 |
|
Declination (DEC) |
-7.8575 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
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Discovered by |
|
|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
|
|
Discovery Paper - URL |
|
|
SIMBAD LINK |
https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-238&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
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K2-238 b
K2-238 b
K2-238 b is an exoplanet orbiting the star K2-238, located about 111316.0 light-years (34129.7 pc) away from Solar System. Its discovery was publicly announced on 2018.
The host star K2-238 has apparent magnitude of 13.8, with absolute magnitude of -3.9. It is 1.2 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 5630 with its spectral types of G2 V
In this planetary system, the extrasolar planet K2-238 b orbits around the star K2-238 every 3.2 days with its orbital distance of 0.05 AU ( 6881502.1 km)
(Projected orbit of K2-238 b around its host star K2-238)
The Star K2-238 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 1.092 AU ( 163332280.7 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.509 AU ( 225767895.8 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 2.300 AU ( 344020310.9 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 3.384 AU ( 506240958.0 km)
Radiation at Planetary Boundary of K2-238 b : 1472031.07 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-238)
Kopparapu Recent Venus for Star K2-238 distance : 1.142 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-238 distance : 1.446 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-238 distance : 1.396 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-238 distance : 1.531 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-238 distance : 2.563 AU
Kopparapu Outer Boundary for Early Mars for Star K2-238 distance : 2.704 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-238)
Original Kopparapu Recent Venus for Star K2-238 distance : 1.140 AU
Original Kopparapu Runaway Greenhouse for Star K2-238 distance : 1.486 AU
Original Kopparapu Moist Greenhouse for Star K2-238 distance : 1.508 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-238 distance : 2.608 AU
Original Kopparapu Outer Boundary for Early Mars for Star K2-238 distance : 2.712 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-238)
(Position in Stellar Map of star K2-238 and its Exoplanet K2-238 b)
(Zoomed position in Stellar Map of star K2-238 and its Exoplanet K2-238 b (zoom level 3))
(Synthetic Spectrum of star K2-238*)
*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
