|
Exoplanet Name : |
HD 81817 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.9078 |
(Rjup) |
10.1759 |
(Rearth) |
|
Mass (Mjup / Me): |
24.1280 |
(Mjup) |
7671.2081 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
3.2330 |
(AU) |
3.2330 |
(AU Est.) |
|
Eccentricity : |
0.0970 |
|
Orbital Period(Yrs) |
2.7958 |
|
Orbital Period(Observed/Estimated) |
1021.20 |
(Days Obs.) |
1023.92 |
(Days Est.) |
|
Surface Gravity (G Earth) |
74.0834 |
|
Star Radiation at Atmospheric Boundary: |
318270.6 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1060.1 |
(K) |
|
Blackbody T 0.3(K) |
995.5 |
(K) |
|
Blackbody T 0.7(K) |
805.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1260.7 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1183.9 |
(K) |
|
Size Class: |
Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
"Radial Velocity, Astrometry" |
|
Mass Detection : |
Astrometry |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
HD 81817 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
994.4 |
|
Stellar Radius(Rsun) : |
91.4 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
4.3 |
(Msun Measured) |
4.3 |
(Msun Estimated) |
|
Star Age : |
0.1 |
(GY) |
|
Temperature : |
4245 |
(K) |
|
Spectral type : |
K3II-III |
|
UV portion[%]: |
0.9 |
|
Visible portion[%]: |
27.2 |
|
IR portion[%]: |
71.9 |
|
Metalicity : |
-0.2 |
|
Absolute Magnitude: |
-3.0 |
|
Apparent Magnitude: |
4.4 |
|
Right Ascension(RA) |
144.2720 |
|
Declination (DEC) |
81.3097 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
04547-02323 |
|
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=HD+81817+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
|
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HD 81817 b
HD 81817 b
HD 81817 b is an exoplanet orbiting the star HD 81817, located about 994.4 light-years (304.9 pc) away from Solar System. Its discovery was publicly announced on 2020.
The host star HD 81817 has apparent magnitude of 4.4, with absolute magnitude of -3.0. It is 4.3 times more massive and 91.4 times bigger compared with our Sun. The surface temperature is 4245 with its spectral types of K3II-III
In this planetary system, the extrasolar planet HD 81817 b orbits around the star HD 81817 every 1021.2 days with its orbital distance of 3.23 AU ( 483649916.0 km)
(Projected orbit of HD 81817 b around its host star HD 81817)
The Star HD 81817 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 35.681 AU ( 5337768044.4 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 49.320 AU ( 7378190362.9 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 75.153 AU ( 11242729323.0 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 110.591 AU ( 16544168711.1 km)
Radiation at Planetary Boundary of HD 81817 b : 318270.64 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 81817)
Kopparapu Recent Venus for Star HD 81817 distance : 39.728 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 81817 distance : 50.288 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 81817 distance : 48.571 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 81817 distance : 53.366 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 81817 distance : 94.287 AU
Kopparapu Outer Boundary for Early Mars for Star HD 81817 distance : 99.465 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 81817)
Original Kopparapu Recent Venus for Star HD 81817 distance : 39.205 AU
Original Kopparapu Runaway Greenhouse for Star HD 81817 distance : 51.961 AU
Original Kopparapu Moist Greenhouse for Star HD 81817 distance : 51.875 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 81817 distance : 95.808 AU
Original Kopparapu Outer Boundary for Early Mars for Star HD 81817 distance : 99.637 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 81817)
(Position in Stellar Map of star HD 81817 and its Exoplanet HD 81817 b)
(Zoomed position in Stellar Map of star HD 81817 and its Exoplanet HD 81817 b (zoom level 3))
(Synthetic Spectrum of star HD 81817*)
*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
