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Exoplanet Name : |
HD 77946 b |
|
Alternate Name : |
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Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.2413 |
(Rjup) |
2.7051 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0264 |
(Mjup) |
8.3840 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0720 |
(AU) |
0.0720 |
(AU Est.) |
|
Eccentricity : |
0.2300 |
|
Orbital Period(Yrs) |
0.0179 |
|
Orbital Period(Observed/Estimated) |
6.53 |
(Days Obs.) |
6.52 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.1458 |
|
Star Radiation at Atmospheric Boundary: |
542444.1 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1211.2 |
(K) |
|
Blackbody T 0.3(K) |
1137.5 |
(K) |
|
Blackbody T 0.7(K) |
920.3 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1440.4 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1352.7 |
(K) |
|
Size Class: |
sub-Neptune-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: |
Not habitable |
|
Star Name : |
HD 77946 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
322.9 |
|
Stellar Radius(Rsun) : |
1.3 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.2 |
(Msun Measured) |
1.2 |
(Msun Estimated) |
|
Star Age : |
3.9 |
(GY) |
|
Temperature : |
6046 |
(K) |
|
Spectral type : |
G0 |
|
UV portion[%]: |
0.3 |
|
Visible portion[%]: |
1.5 |
|
IR portion[%]: |
98.2 |
|
Metalicity : |
0.2 |
|
Absolute Magnitude: |
4.0 |
|
Apparent Magnitude: |
9.0 |
|
Right Ascension(RA) |
136.7776 |
|
Declination (DEC) |
46.6724 |
|
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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HD 77946 b
HD 77946 b
HD 77946 b is an exoplanet orbiting the star HD 77946, located about 322.9 light-years (99.0 pc) away from Solar System. Its discovery was publicly announced on 2024.
The host star HD 77946 has apparent magnitude of 9.0, with absolute magnitude of 4.0. It is 1.2 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 6046 with its spectral types of G0
In this planetary system, the extrasolar planet HD 77946 b orbits around the star HD 77946 every 6.5 days with its orbital distance of 0.07 AU ( 10771046.7 km)
(Projected orbit of HD 77946 b around its host star HD 77946)
The Star HD 77946 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 1.037 AU ( 155190700.6 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.434 AU ( 214514104.4 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 2.185 AU ( 326872023.3 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 3.215 AU ( 481006501.6 km)
Radiation at Planetary Boundary of HD 77946 b : 542444.09 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 77946)
Kopparapu Recent Venus for Star HD 77946 distance : 1.058 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 77946 distance : 1.340 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 77946 distance : 1.294 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 77946 distance : 1.418 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 77946 distance : 2.350 AU
Kopparapu Outer Boundary for Early Mars for Star HD 77946 distance : 2.479 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 77946)
Original Kopparapu Recent Venus for Star HD 77946 distance : 1.065 AU
Original Kopparapu Runaway Greenhouse for Star HD 77946 distance : 1.375 AU
Original Kopparapu Moist Greenhouse for Star HD 77946 distance : 1.409 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 77946 distance : 2.392 AU
Original Kopparapu Outer Boundary for Early Mars for Star HD 77946 distance : 2.488 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 77946)
(Position in Stellar Map of star HD 77946 and its Exoplanet HD 77946 b)
(Zoomed position in Stellar Map of star HD 77946 and its Exoplanet HD 77946 b (zoom level 3))
(Synthetic Spectrum of star HD 77946*)
*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
