|
Exoplanet Name : |
KOI-1257 b |
|
Alternate Name : |
"KOI-1257 b, 2MASS J19245404+4455385 b, K01257.01, KIC 8751933 b, KOI-1257 A b, KOI-1257.01, Kepler-420 b, WISE J192454. |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.9400 |
(Rjup) |
10.5365 |
(Rearth) |
|
Mass (Mjup / Me): |
1.4500 |
(Mjup) |
461.0101 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.3820 |
(AU) |
0.3820 |
(AU Est.) |
|
Eccentricity : |
0.7720 |
|
Orbital Period(Yrs) |
0.2372 |
|
Orbital Period(Observed/Estimated) |
86.65 |
(Days Obs.) |
86.67 |
(Days Est.) |
|
Surface Gravity (G Earth) |
4.1526 |
|
Star Radiation at Atmospheric Boundary: |
9963.0 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
445.9 |
(K) |
|
Blackbody T 0.3(K) |
418.7 |
(K) |
|
Blackbody T 0.7(K) |
338.8 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
530.3 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
498.0 |
(K) |
|
Size Class: |
Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
Primary Transit |
|
Mass Detection : |
|
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
KOI-1257 |
|
Alternate Name : |
"KOI-1257, 2MASS J19245404+4455385, KIC 8751933, KOI-1257 A, Kepler-420, WISE J192454.01+445538.5" |
|
Star Distance(LY) : |
2935.4 |
|
Stellar Radius(Rsun) : |
1.1 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.0 |
(Msun Measured) |
1.0 |
(Msun Estimated) |
|
Star Age : |
9.3 |
(GY) |
|
Temperature : |
5520 |
(K) |
|
Spectral type : |
G5 V |
|
UV portion[%]: |
7.0 |
|
Visible portion[%]: |
43.4 |
|
IR portion[%]: |
49.7 |
|
Metalicity : |
0.3 |
|
Absolute Magnitude: |
3.5 |
|
Apparent Magnitude: |
13.2 |
|
Right Ascension(RA) |
291.2252 |
|
Declination (DEC) |
44.9274 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-420+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
|
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KOI-1257 b
KOI-1257 b
KOI-1257 b is an exoplanet orbiting the star KOI-1257, located about 2935.4 light-years (900.0 pc) away from Solar System. Its discovery was publicly announced on 2014.
The host star KOI-1257 has apparent magnitude of 13.2, with absolute magnitude of 3.5. It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5520 with its spectral types of G5 V
In this planetary system, the extrasolar planet KOI-1257 b orbits around the star KOI-1257 every 86.6 days with its orbital distance of 0.38 AU ( 57146386.6 km)
(Projected orbit of KOI-1257 b around its host star KOI-1257)
The Star KOI-1257 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.746 AU ( 111587285.1 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.031 AU ( 154242789.3 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 1.571 AU ( 235031877.0 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 2.312 AU ( 345859703.0 km)
Radiation at Planetary Boundary of KOI-1257 b : 9963.03 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KOI-1257)
Kopparapu Recent Venus for Star KOI-1257 distance : 0.785 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star KOI-1257 distance : 0.994 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KOI-1257 distance : 0.960 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star KOI-1257 distance : 1.053 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star KOI-1257 distance : 1.768 AU
Kopparapu Outer Boundary for Early Mars for Star KOI-1257 distance : 1.865 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star KOI-1257)
Original Kopparapu Recent Venus for Star KOI-1257 distance : 0.782 AU
Original Kopparapu Runaway Greenhouse for Star KOI-1257 distance : 1.022 AU
Original Kopparapu Moist Greenhouse for Star KOI-1257 distance : 1.035 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KOI-1257 distance : 1.799 AU
Original Kopparapu Outer Boundary for Early Mars for Star KOI-1257 distance : 1.871 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star KOI-1257)
(Position in Stellar Map of star KOI-1257 and its Exoplanet KOI-1257 b)
(Zoomed position in Stellar Map of star KOI-1257 and its Exoplanet KOI-1257 b (zoom level 3))
(Synthetic Spectrum of star KOI-1257*)
*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
