|
Exoplanet Name : |
HD 18757 Ab |
|
Alternate Name : |
HD 18757 D |
|
Status : |
Confirmed |
|
Radius (Rjup / Re): |
0.9078 |
(Rjup) |
10.1759 |
(Rearth) |
|
Mass (Mjup / Me): |
35.2000 |
(Mjup) |
11191.4176 |
(Mearth) |
|
Semi Major Axis / Orbital Distance Calculated |
22.0000 |
(AU) |
22.0000 |
(AU Est.) |
|
Eccentricity : |
0.9430 |
|
Orbital Period(Yrs) |
108.9224 |
|
Orbital Period(Observed/Estimated) |
39785.00 |
(Days Obs.) |
37318.50 |
(Days Est.) |
|
Surface Gravity (G Earth) |
108.0792 |
|
Star Radiation at Atmospheric Boundary: |
3.0 |
(W/m2) |
|
Measured Temperature (K) |
0.0 |
(K) |
|
Blackbody T 0.1(K) |
58.8 |
(K) |
|
Blackbody T 0.3(K) |
55.2 |
(K) |
|
Blackbody T 0.7(K) |
44.7 |
(K) |
|
Tidally Locked Blackbody T 0.1(K) |
69.9 |
(K) |
|
Tidally Locked Blackbody T 0.3(K) |
65.6 |
(K) |
|
Size Class: |
Jupiter-size |
|
Mass Class: |
|
|
Detection Type : |
"Radial Velocity, Astrometry" |
|
Mass Detection : |
Radial Velocity |
|
Radius Detection : |
|
|
Habitability by Solar Eq. Astronomical Unit: |
Not habitable |
|
Habitability by Kopparapu: |
Not habitable |
|
Star Name : |
HD 18757 A |
|
Alternate Name : |
KUI 11 |
|
Star Distance(LY) : |
76.9 |
|
Stellar Radius(Rsun) : |
1.0 |
(Rsun Measured) |
|
Stellar Mass(Msun) : |
1.0 |
(Msun Measured) |
0.9 |
(Msun Estimated) |
|
Star Age : |
11.4 |
(GY) |
|
Temperature : |
5736 |
(K) |
|
Spectral type : |
G1.5V |
|
UV portion[%]: |
7.7 |
|
Visible portion[%]: |
44.6 |
|
IR portion[%]: |
47.7 |
|
Metalicity : |
-0.3 |
|
Absolute Magnitude: |
4.8 |
|
Apparent Magnitude: |
6.6 |
|
Right Ascension(RA) |
46.0401 |
|
Declination (DEC) |
61.7058 |
|
Hubble Space Telescope Guide Star Catalog (GSC) ID |
|
|
Discovered by |
|
|
Discovery Paper - Authors |
|
|
Discovery Paper - Title |
|
|
Discovery Paper - Journal |
|
|
Discovery Paper - URL |
|
|
SIMBAD LINK |
|
|
Open Exoplanet Database Link |
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HD 18757 Ab
HD 18757 Ab
HD 18757 Ab is an exoplanet orbiting the star HD 18757 A, located about 76.9 light-years (23.6 pc) away from Solar System. Its discovery was publicly announced on 2016.
The host star HD 18757 A has apparent magnitude of 6.6, with absolute magnitude of 4.8. It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5736 with its spectral types of G1.5V
In this planetary system, the extrasolar planet HD 18757 Ab orbits around the star HD 18757 A every 39785.0 days with its orbital distance of 22.00 AU ( 3291153155.4 km)
(Projected orbit of HD 18757 Ab around its host star HD 18757 A)
The Star HD 18757 A 's habitable zone is located at the following distance
Inner Boundary (the orbital distance at Venus's Equivalent Radiation )
: 0.746 AU ( 111640835.9 km)
Earth Boundary (the orbital distance at Earth's Equivalent Radiation)
: 1.032 AU ( 154316810.4 km)
Outer Boundary (the orbital distance at Mars's Equivalent Radiation)
: 1.572 AU ( 235144668.8 km)
Snow Line (the orbital distance at Snow Line Equivalent Radiation)
: 2.313 AU ( 346025681.2 km)
Radiation at Planetary Boundary of HD 18757 Ab : 3.01 W/m2
(Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 18757 A)
Kopparapu Recent Venus for Star HD 18757 A distance : 0.775 AU
Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 18757 A distance : 0.982 AU
Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 18757 A distance : 0.948 AU
Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 18757 A distance : 1.040 AU
Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 18757 A distance : 1.736 AU
Kopparapu Outer Boundary for Early Mars for Star HD 18757 A distance : 1.831 AU
(Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 18757 A)
Original Kopparapu Recent Venus for Star HD 18757 A distance : 0.776 AU
Original Kopparapu Runaway Greenhouse for Star HD 18757 A distance : 1.009 AU
Original Kopparapu Moist Greenhouse for Star HD 18757 A distance : 1.027 AU
Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 18757 A distance : 1.766 AU
Original Kopparapu Outer Boundary for Early Mars for Star HD 18757 A distance : 1.837 AU
(Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 18757 A)
(Position in Stellar Map of star HD 18757 A and its Exoplanet HD 18757 Ab)
(Zoomed position in Stellar Map of star HD 18757 A and its Exoplanet HD 18757 Ab (zoom level 3))
(Synthetic Spectrum of star HD 18757 A*)
*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
