|
Exoplanet Name : |
Kepler-21 b |
|
Alternate Name : |
"Kepler-21 b, 2MASS J19092683+3842505 b, BD+38 3455 b, HD 179070 b, HIP 94112 b, K00975.01, KIC 3632418 b, KOI-975 b, KO |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.1460 |
(Rjup) |
1.6365 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0160 |
(Mjup) |
5.0806 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0427 |
(AU) |
0.0427 |
(AU Est.) |
|
Eccentricity : |
0.0200 |
|
Orbital Period(Yrs) |
0.0076 |
|
Orbital Period(Observed/Estimated) |
2.79 |
(Days Obs.) |
2.72 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.8971 |
|
Star Radiation at Atmospheric Boundary: |
3761573.7 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1965.6 |
(K) |
|
Blackbody T 0.3(K) |
1845.9 |
(K) |
|
Blackbody T 0.7(K) |
1493.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
2337.5 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
2195.1 |
(K) |
|
Size Class: |
super-Earth-size |
|
Mass Class: |
|
|
Detection Type : |
Primary Transit |
|
Mass Detection : |
|
|
Radius Detection : |
Primary Transit |
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
Kepler-21 |
|
Alternate Name : |
"Kepler-21, 2MASS J19092683+3842505, BD+38 3455, HD 179070, HIP 94112, KIC 3632418, KOI-975, Kepler-21 A, SAO 67891, TYC |
|
Star Distance(LY) : |
353.9 |
|
Stellar Radius(Rsun) : |
1.9 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.4 |
(Msun Measured) |
1.3 |
(Msun Estimated) |
|
Star Age : |
3.0 |
(GY) |
|
Temperature : |
6202 |
(K) |
|
Spectral type : |
F6 IV |
|
UV portion[%]: |
7.8 |
|
Visible portion[%]: |
44.8 |
|
IR portion[%]: |
47.4 |
|
Metalicity : |
-0.0 |
|
Absolute Magnitude: |
3.1 |
|
Apparent Magnitude: |
8.3 |
|
Right Ascension(RA) |
287.3618 |
|
Declination (DEC) |
38.7140 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
03120-00963 |
|
Discovered by |
|
|
Discovery Paper - Authors |
0 |
|
Discovery Paper - Title |
Kepler-21b: A 1.6 R Earth Planet Transiting the Bright Oscillating F Subgiant Star HD 179070 |
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-21+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/Kepler-21%20b/ |
 |
 |
 |
 |
/
Kepler-21 b
Kepler-21 b
Kepler-21 b is an exoplanet orbiting the star Kepler-21, located about 353.9 light-years (108.5 pc) away from Solar System. Its discovery was publicly announced on 2012.
The host star Kepler-21 has apparent magnitude of 8.3, with absolute magnitude of 3.1. It is 1.4 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6202 with its spectral types of F6 IV
In this planetary system, the extrasolar planet Kepler-21 b orbits around the star Kepler-21 every 2.8 days with its orbital distance of 0.04 AU ( 6390372.2 km)
(Projected orbit of Kepler-21 b around its host star Kepler-21)
The Star Kepler-21 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 1.621 AU ( 242460637.1 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 2.240 AU ( 335143963.0 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 3.414 AU ( 510685232.3 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 5.023 AU ( 751495691.1 km)
Radiation at Planetary Boundary of Kepler-21 b : 3761573.74 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-21)
Kopparapu Recent Venus for Star Kepler-21 distance : 1.637 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-21 distance : 2.073 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-21 distance : 2.002 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-21 distance : 2.194 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-21 distance : 3.625 AU
Kopparapu Outer Boundary for Early Mars for Star Kepler-21 distance : 3.824 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-21)
Original Kopparapu Recent Venus for Star Kepler-21 distance : 1.654 AU
Original Kopparapu Runaway Greenhouse for Star Kepler-21 distance : 2.127 AU
Original Kopparapu Moist Greenhouse for Star Kepler-21 distance : 2.189 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-21 distance : 3.690 AU
Original Kopparapu Outer Boundary for Early Mars for Star Kepler-21 distance : 3.838 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-21)
(Position in Stellar Map of star Kepler-21 and its Exoplanet Kepler-21 b)
(Zoomed position in Stellar Map of star Kepler-21 and its Exoplanet Kepler-21 b (zoom level 3))
(Synthetic Spectrum of star Kepler-21*)
*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
