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Exoplanet Name : |
BD-21 397 b |
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Alternate Name : |
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Status : |
Confirmed |
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Radius (Rjup / Re): |
0.9078 |
(Rjup) |
10.1759 |
(Rearth) |
|
Mass (Mjup / Me): |
0.7000 |
(Mjup) |
222.5566 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
2.6300 |
(AU) |
2.6300 |
(AU Est.) |
|
Eccentricity : |
0.1000 |
|
Orbital Period(Yrs) |
5.1771 |
|
Orbital Period(Observed/Estimated) |
1891.00 |
(Days Obs.) |
1890.55 |
(Days Est.) |
|
Surface Gravity (G Earth) |
2.1493 |
|
Star Radiation at Atmospheric Boundary: |
26.6 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
101.4 |
(K) |
|
Blackbody T 0.3(K) |
95.2 |
(K) |
|
Blackbody T 0.7(K) |
77.0 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
120.6 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
113.2 |
(K) |
|
Size Class: |
Jupiter-size |
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Mass Class: |
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Detection Type : |
Radial Velocity |
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Mass Detection : |
Radial Velocity |
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Radius Detection : |
|
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Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
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Habitability by Kopparapu: |
Not habitable |
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Star Name : |
BD-21 397 |
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Alternate Name : |
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Star Distance(LY) : |
77.4 |
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Stellar Radius(Rsun) : |
0.7 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.7 |
(Msun Measured) |
0.7 |
(Msun Estimated) |
|
Star Age : |
6.2 |
(GY) |
|
Temperature : |
4051 |
(K) |
|
Spectral type : |
K7V |
|
UV portion[%]: |
0.8 |
|
Visible portion[%]: |
25.3 |
|
IR portion[%]: |
73.9 |
|
Metalicity : |
0.1 |
|
Absolute Magnitude: |
7.9 |
|
Apparent Magnitude: |
9.8 |
|
Right Ascension(RA) |
33.3000 |
|
Declination (DEC) |
-21.1964 |
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Hubble Space Telescope Guide Star Catalog (GSC) ID |
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Discovered by |
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Discovery Paper - Authors |
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|
Discovery Paper - Title |
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|
Discovery Paper - Journal |
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|
Discovery Paper - URL |
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SIMBAD LINK |
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Open Exoplanet Database Link |
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BD-21 397 b
BD-21 397 b
BD-21 397 b is an exoplanet orbiting the star BD-21 397, located about 77.4 light-years (23.7 pc) away from Solar System. Its discovery was publicly announced on 2023.
The host star BD-21 397 has apparent magnitude of 9.8, with absolute magnitude of 7.9. It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4051 with its spectral types of K7V
In this planetary system, the extrasolar planet BD-21 397 b orbits around the star BD-21 397 every 1891.0 days with its orbital distance of 2.63 AU ( 393442399.9 km)
(Projected orbit of BD-21 397 b around its host star BD-21 397)
The Star BD-21 397 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.266 AU ( 39728594.5 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.367 AU ( 54915299.9 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.559 AU ( 83678764.3 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.823 AU ( 123136967.4 km)
Radiation at Planetary Boundary of BD-21 397 b : 26.64 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star BD-21 397)
Kopparapu Recent Venus for Star BD-21 397 distance : 0.297 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star BD-21 397 distance : 0.376 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star BD-21 397 distance : 0.363 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star BD-21 397 distance : 0.399 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star BD-21 397 distance : 0.712 AU
Kopparapu Outer Boundary for Early Mars for Star BD-21 397 distance : 0.751 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star BD-21 397)
Original Kopparapu Recent Venus for Star BD-21 397 distance : 0.293 AU
Original Kopparapu Runaway Greenhouse for Star BD-21 397 distance : 0.389 AU
Original Kopparapu Moist Greenhouse for Star BD-21 397 distance : 0.388 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star BD-21 397 distance : 0.723 AU
Original Kopparapu Outer Boundary for Early Mars for Star BD-21 397 distance : 0.752 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star BD-21 397)
(Position in Stellar Map of star BD-21 397 and its Exoplanet BD-21 397 b)
(Zoomed position in Stellar Map of star BD-21 397 and its Exoplanet BD-21 397 b (zoom level 3))
(Synthetic Spectrum of star BD-21 397*)
*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
