麻豆淫院

GJ504b is an exoplanet orbiting a sun-like star GJ 504. It is estimated to be three to six times more massive than Jupiter, making it the lowest-mass planet ever directly imaged. This faint and cold planet, often referred to as the "second Jupiter," was discovered as part of the Strategic Explorations of Exoplanets and Disks with Subaru (SEEDS) Project. The SEEDS project aimed to conduct direct observations of exoplanets to discover and explore their features using the coronagraph imager HiCIAO and the adaptive optics system with 188 elements AO 188.

GJ 504 is a star in the constellation Virgo, about 60 light-years away from Earth. The planet GJ504b is captured in the upper right of the star, at the center of the image. The apparent distance between GJ 504 and GJ504b is 44 astronomical units (au), which is similar to the distance between the sun and Pluto.

Exoplanets are incredibly faint, making direct imaging very challenging. However, direct observation enables us not only to discover these planets but also to characterize them. For instance, GJ504b was found to have a very low temperature of approximately 500 Kelvin (or 230掳C) and its atmosphere is less cloudy compared to those of other exoplanets previously discovered.