|
Exoplanet Name : |
tau Gem b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.9078 |
(Rjup) |
10.1759 |
(Rearth) |
|
Mass (Mjup / Me): |
20.6000 |
(Mjup) |
6549.5228 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
1.1700 |
(AU) |
1.1700 |
(AU Est.) |
|
Eccentricity : |
0.0310 |
|
Orbital Period(Yrs) |
0.8364 |
|
Orbital Period(Observed/Estimated) |
305.50 |
(Days Obs.) |
304.79 |
(Days Est.) |
|
Surface Gravity (G Earth) |
63.2509 |
|
Star Radiation at Atmospheric Boundary: |
238544.4 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
986.4 |
(K) |
|
Blackbody T 0.3(K) |
926.3 |
(K) |
|
Blackbody T 0.7(K) |
749.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1173.0 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1101.6 |
(K) |
|
Size Class: |
Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
|
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
tau Gem |
|
Alternate Name : |
|
|
Star Distance(LY) : |
321.0 |
|
Stellar Radius(Rsun) : |
26.8 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
2.3 |
(Msun Measured) |
2.3 |
(Msun Estimated) |
|
Star Age : |
1.2 |
(GY) |
|
Temperature : |
4388 |
(K) |
|
Spectral type : |
K2III |
|
UV portion[%]: |
1.2 |
|
Visible portion[%]: |
29.1 |
|
IR portion[%]: |
69.7 |
|
Metalicity : |
0.1 |
|
Absolute Magnitude: |
-0.6 |
|
Apparent Magnitude: |
4.4 |
|
Right Ascension(RA) |
107.7849 |
|
Declination (DEC) |
30.2453 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
02438-01059 |
|
Discovered by |
|
|
Discovery Paper - Authors |
"D. S. Mitchell, S. Reffert, T. Trifonov, A. Quirrenbach, D. A. Fischer" |
|
Discovery Paper - Title |
Precise radial velocities of giant stars V. A brown dwarf and a planet orbiting the K giant stars tau Gem and 91 Aqr |
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau+Gem+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/tau%20Gem%20b/ |
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tau Gem b
tau Gem b
tau Gem b is an exoplanet orbiting the star tau Gem, located about 321.0 light-years (98.4 pc) away from Solar System. Its discovery was publicly announced on 2004.
The host star tau Gem has apparent magnitude of 4.4, with absolute magnitude of -0.6. It is 2.3 times more massive and 26.8 times bigger compared with our Sun. The surface temperature is 4388 with its spectral types of K2III
In this planetary system, the extrasolar planet tau Gem b orbits around the star tau Gem every 305.5 days with its orbital distance of 1.17 AU ( 175029508.7 km)
(Projected orbit of tau Gem b around its host star tau Gem)
The Star tau Gem 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 11.179 AU ( 1672346032.9 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 15.452 AU ( 2311619253.8 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 23.546 AU ( 3522396182.5 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 34.649 AU ( 5183360288.8 km)
Radiation at Planetary Boundary of tau Gem b : 238544.36 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star tau Gem)
Kopparapu Recent Venus for Star tau Gem distance : 12.394 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star tau Gem distance : 15.689 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star tau Gem distance : 15.153 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star tau Gem distance : 16.645 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star tau Gem distance : 29.213 AU
Kopparapu Outer Boundary for Early Mars for Star tau Gem distance : 30.817 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star tau Gem)
Original Kopparapu Recent Venus for Star tau Gem distance : 12.228 AU
Original Kopparapu Runaway Greenhouse for Star tau Gem distance : 16.203 AU
Original Kopparapu Moist Greenhouse for Star tau Gem distance : 16.179 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star tau Gem distance : 29.687 AU
Original Kopparapu Outer Boundary for Early Mars for Star tau Gem distance : 30.874 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star tau Gem)
(Position in Stellar Map of star tau Gem and its Exoplanet tau Gem b)
(Zoomed position in Stellar Map of star tau Gem and its Exoplanet tau Gem b (zoom level 3))
(Synthetic Spectrum of star tau Gem*)
*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
