HD 143811 AB b: 1.4 Times Jupiter
Gas giant around HD 143811 A
It is 1.40 times Jupiter's radius, closest in size to Jupiter, and 1938.8 times Earth's mass. A year there lasts 320.3 years, on an orbit 162.7 times Mercury's distance from the Sun. The host star HD 143811 A runs at 6791 K with 1.32 times the Sun's mass.
Radius
15.69 Earth radii
Mass
1938.8 Earth masses
One year
320.3 years
Orbit radius
63.0000 AU
Host star
HD 143811 A at 6791 K
Distance
446 light-years
1.4xJupiter: among the largest planets measured
What the archive holds on this planet
A size. Yes.
A measured mass. Yes.
A density, so rock and gas can be told apart. No.
An orbital distance. Yes.
A temperature someone observed rather than calculated. No.
An eccentricity, so we know if the orbit is a circle. Yes.
What the picture gives
Where it is, how bright it is, and a spectrum taken from the planet directly.
This is one of the rare planets that has actually been photographed. Fewer than a hundred of the thousands known were found this way, and they are mostly young giants far from their stars.
Found by Paranal Observatory in 2025.
Fewer than a hundred planets have been photographed rather than inferred. Does \
seeing one directly change how real it feels to you?
