|
Exoplanet Name : |
TOI-256 b |
|
Alternate Name : |
LHS 1140 b |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.1541 |
(Rjup) |
1.7270 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0220 |
(Mjup) |
6.9819 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0936 |
(AU) |
0.0936 |
(AU Est.) |
|
Eccentricity : |
0.0600 |
|
Orbital Period(Yrs) |
0.0677 |
|
Orbital Period(Observed/Estimated) |
24.74 |
(Days Obs.) |
27.37 |
(Days Est.) |
|
Surface Gravity (G Earth) |
2.3410 |
|
Star Radiation at Atmospheric Boundary: |
465.4 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
207.3 |
(K) |
|
Blackbody T 0.3(K) |
194.7 |
(K) |
|
Blackbody T 0.7(K) |
157.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
246.5 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
231.5 |
(K) |
|
Size Class: |
super-Earth-size |
|
Mass Class: |
|
|
Detection Type : |
Primary Transit |
|
Mass Detection : |
Radial Velocity |
|
Radius Detection : |
Primary Transit |
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Habitable |
|
Star Name : |
LHS 1140 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
48.9 |
|
Stellar Radius(Rsun) : |
0.2 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.1 |
(Msun Measured) |
0.2 |
(Msun Estimated) |
|
Star Age : |
5.0 |
(GY) |
|
Temperature : |
3131 |
(K) |
|
Spectral type : |
M4.5 |
|
UV portion[%]: |
0.1 |
|
Visible portion[%]: |
7.1 |
|
IR portion[%]: |
92.7 |
|
Metalicity : |
-0.2 |
|
Absolute Magnitude: |
13.3 |
|
Apparent Magnitude: |
14.2 |
|
Right Ascension(RA) |
11.2472 |
|
Declination (DEC) |
-15.2714 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
|
|
Discovery Paper - URL |
|
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+1140+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
|
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TOI-256 b
TOI-256 b
TOI-256 b is an exoplanet orbiting the star LHS 1140, located about 48.9 light-years (15.0 pc) away from Solar System. Its discovery was publicly announced on 2017.
The host star LHS 1140 has apparent magnitude of 14.2, with absolute magnitude of 13.3. It is 0.1 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3131 with its spectral types of M4.5
In this planetary system, the extrasolar planet TOI-256 b orbits around the star LHS 1140 every 24.7 days with its orbital distance of 0.09 AU ( 14002360.7 km)
(Projected orbit of TOI-256 b around its host star LHS 1140)
The Star LHS 1140 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.040 AU ( 5909315.7 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.055 AU ( 8168218.6 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.083 AU ( 12446557.5 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.122 AU ( 18315654.6 km)
Radiation at Planetary Boundary of TOI-256 b : 465.38 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star LHS 1140)
Kopparapu Recent Venus for Star LHS 1140 distance : 0.045 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star LHS 1140 distance : 0.057 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star LHS 1140 distance : 0.055 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star LHS 1140 distance : 0.060 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star LHS 1140 distance : 0.112 AU
Kopparapu Outer Boundary for Early Mars for Star LHS 1140 distance : 0.119 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star LHS 1140)
Original Kopparapu Recent Venus for Star LHS 1140 distance : 0.045 AU
Original Kopparapu Runaway Greenhouse for Star LHS 1140 distance : 0.059 AU
Original Kopparapu Moist Greenhouse for Star LHS 1140 distance : 0.059 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star LHS 1140 distance : 0.114 AU
Original Kopparapu Outer Boundary for Early Mars for Star LHS 1140 distance : 0.119 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star LHS 1140)
(Position in Stellar Map of star LHS 1140 and its Exoplanet TOI-256 b)
(Zoomed position in Stellar Map of star LHS 1140 and its Exoplanet TOI-256 b (zoom level 3))
(Synthetic Spectrum of star LHS 1140*)
*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
