|
Exoplanet Name : |
GJ 887 b |
|
Alternate Name : |
|
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.1304 |
(Rjup) |
1.4615 |
(Rearth) |
|
Mass (Mjup / Me): |
0.0132 |
(Mjup) |
4.1968 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
0.0680 |
(AU) |
0.0680 |
(AU Est.) |
|
Eccentricity : |
0.0000 |
|
Orbital Period(Yrs) |
0.0253 |
|
Orbital Period(Observed/Estimated) |
9.25 |
(Days Obs.) |
9.26 |
(Days Est.) |
|
Surface Gravity (G Earth) |
1.9649 |
|
Star Radiation at Atmospheric Boundary: |
10893.3 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
456.0 |
(K) |
|
Blackbody T 0.3(K) |
428.2 |
(K) |
|
Blackbody T 0.7(K) |
346.5 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
542.2 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
509.2 |
(K) |
|
Size Class: |
super-Earth-size |
|
Mass Class: |
|
|
Detection Type : |
Radial Velocity |
|
Mass Detection : |
Radial Velocity |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
GJ 887 |
|
Alternate Name : |
HD 217987 |
|
Star Distance(LY) : |
10.7 |
|
Stellar Radius(Rsun) : |
0.5 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
0.5 |
(Msun Measured) |
0.5 |
(Msun Estimated) |
|
Star Age : |
0.0 |
(GY) |
|
Temperature : |
3688 |
(K) |
|
Spectral type : |
M1V |
|
UV portion[%]: |
0.3 |
|
Visible portion[%]: |
13.2 |
|
IR portion[%]: |
86.5 |
|
Metalicity : |
-0.1 |
|
Absolute Magnitude: |
9.8 |
|
Apparent Magnitude: |
7.3 |
|
Right Ascension(RA) |
346.4668 |
|
Declination (DEC) |
-35.8531 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
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=GJ+887+&submit=SIMBAD+search |
|
Open Exoplanet Database Link |
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GJ 887 b
GJ 887 b
GJ 887 b is an exoplanet orbiting the star GJ 887, located about 10.7 light-years ( 3.3 pc) away from Solar System. Its discovery was publicly announced on 2020.
The host star GJ 887 has apparent magnitude of 7.3, with absolute magnitude of 9.8. It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3688 with its spectral types of M1V
In this planetary system, the extrasolar planet GJ 887 b orbits around the star GJ 887 every 9.3 days with its orbital distance of 0.07 AU ( 10172655.2 km)
(Projected orbit of GJ 887 b around its host star GJ 887)
The Star GJ 887 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.139 AU ( 20770417.2 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 0.192 AU ( 28710144.5 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 0.292 AU ( 43747906.6 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 0.430 AU ( 64376961.1 km)
Radiation at Planetary Boundary of GJ 887 b : 10893.34 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 887)
Kopparapu Recent Venus for Star GJ 887 distance : 0.156 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 887 distance : 0.198 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 887 distance : 0.191 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 887 distance : 0.210 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 887 distance : 0.382 AU
Kopparapu Outer Boundary for Early Mars for Star GJ 887 distance : 0.403 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 887)
Original Kopparapu Recent Venus for Star GJ 887 distance : 0.155 AU
Original Kopparapu Runaway Greenhouse for Star GJ 887 distance : 0.205 AU
Original Kopparapu Moist Greenhouse for Star GJ 887 distance : 0.205 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 887 distance : 0.388 AU
Original Kopparapu Outer Boundary for Early Mars for Star GJ 887 distance : 0.403 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 887)
(Position in Stellar Map of star GJ 887 and its Exoplanet GJ 887 b)
(Zoomed position in Stellar Map of star GJ 887 and its Exoplanet GJ 887 b (zoom level 3))
(Synthetic Spectrum of star GJ 887*)
*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
