|
Exoplanet Name : |
GJ 720A b |
|
Alternate Name : |
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|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.2111 |
(Rjup) |
2.3666 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0429 |
(Mjup) |
13.6459 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.1190 |
(AU) |
0.1190 |
(AU Est.) |
|
Eccentricity : |
0.1000 |
|
Orbital Period(Yrs) |
0.0533 |
|
Orbital Period(Observed/Estimated) |
19.47 |
(Days Obs.) |
19.86 |
(Days Est.) |
|
Surface Gravity (G Earth) |
2.4364 |
|
Star Radiation at Atmospheric Boundary: |
5886.5 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
390.9 |
(K) |
|
Blackbody T 0.3(K) |
367.1 |
(K) |
|
Blackbody T 0.7(K) |
297.0 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
464.9 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
436.6 |
(K) |
|
Size Class: |
sub-Neptune-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Radial Velocity |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
GJ 720A |
|
Alternate Name : |
|
|
Star Distance(LY) : |
50.7 |
|
Stellar Radius(Rsun) : |
0.6 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.6 |
(Msun Measured) |
0.6 |
(Msun Estimated) |
|
Star Age : |
0.0 |
(GY) |
|
Temperature : |
3837 |
(K) |
|
Spectral type : |
M0.5V |
|
UV portion[%]: |
0.5 |
|
Visible portion[%]: |
20.2 |
|
IR portion[%]: |
79.3 |
|
Metalicity : |
-0.1 |
|
Absolute Magnitude: |
9.0 |
|
Apparent Magnitude: |
10.0 |
|
Right Ascension(RA) |
278.8292 |
|
Declination (DEC) |
45.7456 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
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Discovered by |
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|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
|
|
Discovery Paper - URL |
|
|
SIMBAD LINK |
https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+720A&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
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GJ 720A b
GJ 720A b
GJ 720A b is an exoplanet orbiting the star GJ 720A, located about 50.7 light-years (15.6 pc) away from Solar System. Its discovery was publicly announced on 2021.
The host star GJ 720A has apparent magnitude of 10.0, with absolute magnitude of 9.0. It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3837 with its spectral types of M0.5V
In this planetary system, the extrasolar planet GJ 720A b orbits around the star GJ 720A every 19.5 days with its orbital distance of 0.12 AU ( 17802146.6 km)
(Projected orbit of GJ 720A b around its host star GJ 720A)
The Star GJ 720A 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.179 AU ( 26719586.8 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.247 AU ( 36933451.6 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.376 AU ( 56278406.9 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.554 AU ( 82816141.2 km)
Radiation at Planetary Boundary of GJ 720A b : 5886.46 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 720A)
Kopparapu Recent Venus for Star GJ 720A distance : 0.201 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 720A distance : 0.254 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 720A distance : 0.245 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 720A distance : 0.270 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 720A distance : 0.486 AU
Kopparapu Outer Boundary for Early Mars for Star GJ 720A distance : 0.513 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 720A)
Original Kopparapu Recent Venus for Star GJ 720A distance : 0.199 AU
Original Kopparapu Runaway Greenhouse for Star GJ 720A distance : 0.263 AU
Original Kopparapu Moist Greenhouse for Star GJ 720A distance : 0.263 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 720A distance : 0.494 AU
Original Kopparapu Outer Boundary for Early Mars for Star GJ 720A distance : 0.514 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 720A)
(Position in Stellar Map of star GJ 720A and its Exoplanet GJ 720A b)
(Zoomed position in Stellar Map of star GJ 720A and its Exoplanet GJ 720A b (zoom level 3))
(Synthetic Spectrum of star GJ 720A*)
*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
