|
Exoplanet Name : |
TOI-257 b |
|
Alternate Name : |
HD 19916 b |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.6260 |
(Rjup) |
7.0168 |
(Rearth) |
|
Mass (Mjup / Me): |
0.1340 |
(Mjup) |
42.6037 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.1523 |
(AU) |
0.1523 |
(AU Est.) |
|
Eccentricity : |
0.2400 |
|
Orbital Period(Yrs) |
0.0503 |
|
Orbital Period(Observed/Estimated) |
18.39 |
(Days Obs.) |
18.42 |
(Days Est.) |
|
Surface Gravity (G Earth) |
0.8653 |
|
Star Radiation at Atmospheric Boundary: |
267117.7 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1014.7 |
(K) |
|
Blackbody T 0.3(K) |
952.9 |
(K) |
|
Blackbody T 0.7(K) |
771.0 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1206.6 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1133.2 |
(K) |
|
Size Class: |
sub-Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
Primary Transit |
|
Mass Detection : |
Spectrum |
|
Radius Detection : |
Primary Transit |
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
TOI-257 |
|
Alternate Name : |
HD 19916 |
|
Star Distance(LY) : |
251.4 |
|
Stellar Radius(Rsun) : |
1.9 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.4 |
(Msun Measured) |
1.4 |
(Msun Estimated) |
|
Star Age : |
3.1 |
(GY) |
|
Temperature : |
6075 |
(K) |
|
Spectral type : |
F8/G0V |
|
UV portion[%]: |
7.8 |
|
Visible portion[%]: |
44.8 |
|
IR portion[%]: |
47.4 |
|
Metalicity : |
0.2 |
|
Absolute Magnitude: |
17.6 |
|
Apparent Magnitude: |
22.0 |
|
Right Ascension(RA) |
47.5167 |
|
Declination (DEC) |
-50.8325 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
08064-00286 |
|
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=TOI-257&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
|
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TOI-257 b
TOI-257 b
TOI-257 b is an exoplanet orbiting the star TOI-257, located about 251.4 light-years (77.1 pc) away from Solar System. Its discovery was publicly announced on 2020.
The host star TOI-257 has apparent magnitude of 22.0, with absolute magnitude of 17.6. It is 1.4 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6075 with its spectral types of F8/G0V
In this planetary system, the extrasolar planet TOI-257 b orbits around the star TOI-257 every 18.4 days with its orbital distance of 0.15 AU ( 22783755.7 km)
(Projected orbit of TOI-257 b around its host star TOI-257)
The Star TOI-257 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 1.540 AU ( 230359941.6 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 2.128 AU ( 318417639.6 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 3.243 AU ( 485198017.0 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 4.773 AU ( 713990137.2 km)
Radiation at Planetary Boundary of TOI-257 b : 267117.72 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-257)
Kopparapu Recent Venus for Star TOI-257 distance : 1.567 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-257 distance : 1.985 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-257 distance : 1.917 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-257 distance : 2.101 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-257 distance : 3.480 AU
Kopparapu Outer Boundary for Early Mars for Star TOI-257 distance : 3.671 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-257)
Original Kopparapu Recent Venus for Star TOI-257 distance : 1.579 AU
Original Kopparapu Runaway Greenhouse for Star TOI-257 distance : 2.038 AU
Original Kopparapu Moist Greenhouse for Star TOI-257 distance : 2.090 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-257 distance : 3.542 AU
Original Kopparapu Outer Boundary for Early Mars for Star TOI-257 distance : 3.684 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-257)
(Position in Stellar Map of star TOI-257 and its Exoplanet TOI-257 b)
(Zoomed position in Stellar Map of star TOI-257 and its Exoplanet TOI-257 b (zoom level 3))
(Synthetic Spectrum of star TOI-257*)
*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
