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Exoplanet Name : |
GJ 720 Ab |
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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 |
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Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Radial Velocity |
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Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
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Star Name : |
GJ 720 A |
|
Alternate Name : |
"BD+45 2743, LHS 3394, LDS 6329 A" |
|
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[%]: |
0.4 |
|
Visible portion[%]: |
19.4 |
|
IR portion[%]: |
80.1 |
|
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 |
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|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
|
|
Discovery Paper - URL |
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|
SIMBAD LINK |
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|
Open Exoplanet Database Link |
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GJ 720 Ab
GJ 720 Ab
GJ 720 Ab is an exoplanet orbiting the star GJ 720 A, located about 50.7 light-years (15.6 pc) away from Solar System. Its discovery was publicly announced on 2021.
The host star GJ 720 A 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 720 Ab orbits around the star GJ 720 A every 19.5 days with its orbital distance of 0.12 AU ( 17802146.6 km)
(Projected orbit of GJ 720 Ab around its host star GJ 720 A)
The Star GJ 720 A '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 720 Ab : 5886.46 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 720 A)
Kopparapu Recent Venus for Star GJ 720 A distance : 0.201 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 720 A distance : 0.254 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 720 A distance : 0.245 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 720 A distance : 0.270 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 720 A distance : 0.486 AU
Kopparapu Outer Boundary for Early Mars for Star GJ 720 A distance : 0.513 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 720 A)
Original Kopparapu Recent Venus for Star GJ 720 A distance : 0.199 AU
Original Kopparapu Runaway Greenhouse for Star GJ 720 A distance : 0.263 AU
Original Kopparapu Moist Greenhouse for Star GJ 720 A distance : 0.263 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 720 A distance : 0.494 AU
Original Kopparapu Outer Boundary for Early Mars for Star GJ 720 A distance : 0.514 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 720 A)
(Position in Stellar Map of star GJ 720 A and its Exoplanet GJ 720 Ab)
(Zoomed position in Stellar Map of star GJ 720 A and its Exoplanet GJ 720 Ab (zoom level 3))
(Synthetic Spectrum of star GJ 720 A*)
*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
