|
Exoplanet Name : |
HD 20781 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.1066 |
(Rjup) |
1.1946 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0061 |
(Mjup) |
1.9299 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0529 |
(AU) |
0.0529 |
(AU Est.) |
|
Eccentricity : |
0.1000 |
|
Orbital Period(Yrs) |
0.0145 |
|
Orbital Period(Observed/Estimated) |
5.31 |
(Days Obs.) |
0.00 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.3524 |
|
Star Radiation at Atmospheric Boundary: |
488431.4 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1179.9 |
(K) |
|
Blackbody T 0.3(K) |
1108.0 |
(K) |
|
Blackbody T 0.7(K) |
896.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1403.1 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1317.7 |
(K) |
|
Size Class: |
Earth-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 : |
HD 20781 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
116.7 |
|
Stellar Radius(Rsun) : |
1.1 |
(Rsun Estimated) |
|
Stellar Mass(Msun) : |
0.0 |
(Msun Measured) |
0.7 |
(Msun Estimated) |
|
Star Age : |
0.0 |
(GY) |
|
Temperature : |
5500 |
(K) |
|
Spectral type : |
G9.5V |
|
UV portion[%]: |
6.9 |
|
Visible portion[%]: |
43.2 |
|
IR portion[%]: |
49.9 |
|
Metalicity : |
0.0 |
|
Absolute Magnitude: |
5.7 |
|
Apparent Magnitude: |
8.4 |
|
Right Ascension(RA) |
50.0123 |
|
Declination (DEC) |
-28.7839 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
06445-00983 |
|
Discovered by |
|
|
Discovery Paper - Authors |
"S. Desidera, M. Barbieri" |
|
Discovery Paper - Title |
Properties of planets in binary systems. The role of binary separation |
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+20781+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/HD%2020781%20b/ |
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HD 20781 b
HD 20781 b
HD 20781 b is an exoplanet orbiting the star HD 20781, located about 116.7 light-years (35.8 pc) away from Solar System. Its discovery was publicly announced on 2011.
The host star HD 20781 has apparent magnitude of 8.4, with absolute magnitude of 5.7.
In this planetary system, the extrasolar planet HD 20781 b orbits around the star HD 20781 every 5.3 days with its orbital distance of 0.05 AU ( 7913727.4 km)
(Projected orbit of HD 20781 b around its host star HD 20781)
The Star HD 20781 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.723 AU ( 108196493.8 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.000 AU ( 149555829.6 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 1.523 AU ( 227889987.7 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 2.242 AU ( 335350100.1 km)
Radiation at Planetary Boundary of HD 20781 b : 488431.45 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 20781)
Kopparapu Recent Venus for Star HD 20781 distance : 0.762 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 20781 distance : 0.965 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 20781 distance : 0.932 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 20781 distance : 1.022 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 20781 distance : 1.718 AU
Kopparapu Outer Boundary for Early Mars for Star HD 20781 distance : 1.812 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 20781)
Original Kopparapu Recent Venus for Star HD 20781 distance : 0.759 AU
Original Kopparapu Runaway Greenhouse for Star HD 20781 distance : 0.992 AU
Original Kopparapu Moist Greenhouse for Star HD 20781 distance : 1.004 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 20781 distance : 1.747 AU
Original Kopparapu Outer Boundary for Early Mars for Star HD 20781 distance : 1.817 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 20781)
(Position in Stellar Map of star HD 20781 and its Exoplanet HD 20781 b)
(Zoomed position in Stellar Map of star HD 20781 and its Exoplanet HD 20781 b (zoom level 3))
(Synthetic Spectrum of star HD 20781*)
*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
