There is a special sub-variety of life-bearing gas giant that is particularly rare, and interesting: they glow green. Bright green. Radioactive, fluorescent green, bright enough to be seen from space. They are the Glowing Green Gas Giants.

One can speculate about the cause. As this fluorescent green colouration only ever occurs on life-bearing worlds, the presence of life must be a causal factor. But since the vast majority of life-bearing worlds are not fluorescent green in colour, it is not merely the presence of microscopic airborne lifeforms that is the causal factor. Unfortunately, the numbers of such worlds that have been fully documented is still low: forty of them have been reported on publicly-available sources to date. Further examples will be required for any statistically significant study as to the collective origins of this peculiar phenomenon.

Source

This appears to be the first GGG reported with a confirmed location, per source link.

This Green Gas Giant is notable for being the first one that was reported with a confirmed location. Several months earlier, CMDR Kelly Elbridge published a photo showing a green gas giant, but she failed to note down the system and its precise location was lost. But this planet's location was logged, and the green gas giant's existence was confirmed by other pilots.

Besides its history, Blua Hypa HT-F d12-1226 12 is notable for some other things. First, as the identification implies, it's the twelfth body in the system: no other green gas giant has that many bodies before it. (Although there do exist green giants which have a larger semi-major axis.) Second, ever since it has been found, it's the smallest known green gas giant, with a radius of only 15,740 km. (For a long while, it was also the lightest, but two others have since been found which are even lighter.)

Visually, the planet is impressive as well: it has two large glowing bands, one above and one below the plane of its rings, and some of the cyclones are glowing green as well. There are also some landable moons circling the gas giant, and the rest of the system has plenty of bodies as well.