|
Exoplanet Name : |
HAT-P-21 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
1.0240 |
(Rjup) |
11.4780 |
(Rearth) |
|
Mass (Mjup / Me): |
4.0630 |
(Mjup) |
1291.7821 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0494 |
(AU) |
0.0494 |
(AU Est.) |
|
Eccentricity : |
0.2280 |
|
Orbital Period(Yrs) |
0.0113 |
|
Orbital Period(Observed/Estimated) |
4.12 |
(Days Obs.) |
4.12 |
(Days Est.) |
|
Surface Gravity (G Earth) |
9.8052 |
|
Star Radiation at Atmospheric Boundary: |
598275.3 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
1241.3 |
(K) |
|
Blackbody T 0.3(K) |
1165.7 |
(K) |
|
Blackbody T 0.7(K) |
943.2 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
1476.1 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
1386.2 |
(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 : |
HAT-P-21 |
|
Alternate Name : |
|
|
Star Distance(LY) : |
874.4 |
|
Stellar Radius(Rsun) : |
1.1 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.9 |
(Msun Measured) |
0.9 |
(Msun Estimated) |
|
Star Age : |
10.2 |
(GY) |
|
Temperature : |
5588 |
(K) |
|
Spectral type : |
G3 |
|
UV portion[%]: |
7.2 |
|
Visible portion[%]: |
43.8 |
|
IR portion[%]: |
49.0 |
|
Metalicity : |
0.0 |
|
Absolute Magnitude: |
4.3 |
|
Apparent Magnitude: |
11.5 |
|
Right Ascension(RA) |
171.2749 |
|
Declination (DEC) |
41.0281 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
03013-01229 |
|
Discovered by |
|
|
Discovery Paper - Authors |
HOG E.; FABRICIUS C.; MAKAROV V.V.; URBAN S.; CORBIN T.; WYCOFF G.; BASTIAN U.; SCHWEKENDIEK P.; WICENEC A. |
|
Discovery Paper - Title |
The Tycho-2 catalogue of the 2.5 million brightest stars. |
|
Discovery Paper - Journal |
0 |
|
Discovery Paper - URL |
0 |
|
SIMBAD LINK |
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-21+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
http://www.openexoplanetcatalogue.com/planet/HAT-P-21%20b/ |
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HAT-P-21 b
HAT-P-21 b
HAT-P-21 b is an exoplanet orbiting the star HAT-P-21, located about 874.4 light-years (268.1 pc) away from Solar System. Its discovery was publicly announced on 2010.
The host star HAT-P-21 has apparent magnitude of 11.5, with absolute magnitude of 4.3. It is 0.9 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5588 with its spectral types of G3
In this planetary system, the extrasolar planet HAT-P-21 b orbits around the star HAT-P-21 every 4.1 days with its orbital distance of 0.05 AU ( 7390134.8 km)
(Projected orbit of HAT-P-21 b around its host star HAT-P-21)
The Star HAT-P-21 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.747 AU ( 111823526.8 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.033 AU ( 154569337.0 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 1.574 AU ( 235529463.5 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 2.317 AU ( 346591923.4 km)
Radiation at Planetary Boundary of HAT-P-21 b : 598275.28 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-21)
Kopparapu Recent Venus for Star HAT-P-21 distance : 0.784 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-21 distance : 0.992 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-21 distance : 0.958 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-21 distance : 1.051 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-21 distance : 1.762 AU
Kopparapu Outer Boundary for Early Mars for Star HAT-P-21 distance : 1.858 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-21)
Original Kopparapu Recent Venus for Star HAT-P-21 distance : 0.782 AU
Original Kopparapu Runaway Greenhouse for Star HAT-P-21 distance : 1.020 AU
Original Kopparapu Moist Greenhouse for Star HAT-P-21 distance : 1.034 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-21 distance : 1.792 AU
Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-21 distance : 1.864 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-21)
(Position in Stellar Map of star HAT-P-21 and its Exoplanet HAT-P-21 b)
(Zoomed position in Stellar Map of star HAT-P-21 and its Exoplanet HAT-P-21 b (zoom level 3))
(Synthetic Spectrum of star HAT-P-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
