Cocytus System:

2 orange dwarfs orbiting each other, ala alpha centauri style. Most bodies orbit around these two, or around one star or another.

One is named Antenora, the other Ptolomea.

1 brown dwarf, orbiting much further out, probably captured due to it being much older. Has several small bodies orbiting it, and some are a mix of captured bodies from the main parts of the system, and some that managed to follow it into this system. Has a spectral class of Y. The brown dwarf was given the name "Judecca" by humans, far before this system was explored by them at all.

Planetary system layout:

2 hot jupiters found in close orbit of each of the two orange dwarves, they may become chthonian worlds in the future. Neither have any moons, most likely they either crashed into the gas giants or the suns themselves.

1 one of the stars has three rocky planets afterwards, followed by an asteroid belt, and two ice giants. The moons of the ice giants might have life.

The other star has primarily large gas giants orbiting it, with one having rings that make Saturn's look tiny.

Several planets orbit both stars, with the first three being rocky planets. The 2nd that orbits both stars is host to complex, carbon-based life. The third had life at one point, but some event wiped it out entirely. A colossal belt of asteroids follows afterwards, with one more rocky planet, and four gargantuan gas giants, and an extremely large ice giant.

Judecca lies outside of the orbit of both main stars, with several small rocky bodies orbiting it, comparable in size to some moons found in our solar system. The closest is somewhat habitable, but is still very cold, and is mostly covered in ice and snow, with the equator being slush. If life does exist here, it would have evolved independently of any other life in the system, due to the body having become a part of this system only when Judecca was captured 2.35 billion years ago. However, it could have also suffered backwards and forwards contamination multiple times, as well.

The primary life-bearing world had a civilization at one point, that had reached an industrial revolution, but a cometary impact wiped it out, and triggered a major mass extinction that the world is still recovering from. Some scant evidence suggests this wasn't the first civilization to originate here, but what became of the civilization simply dubbed "The Precursors" is unclear, due to various geological events and such destroying a lot of their artifacts. Some speculation exists they may have become more technologically advanced compared to their successors, as asteroids seemingly stripped of many metals exist in the system, and some bodies bear strange formations that cannot be explained by natural means. In addition, a crashed satellite of unknown make was found on the primary life-bearing body that was anomalously old. An asteroid was also found orbiting the third rocky planet orbiting both stars in a fashion that seems to have been towed in through artificial means, possibly for mining. However, whatever intents were planned were never completed, as the asteroid is still relatively intact.

Primary life-bearing body has three moons, one is a captured asteroid, and two are big enough to be rounded by their gravity, but compared to our moon, are quite small.

Main life-bearing body is 75% the mass of Earth

Current life-bearing world is comparable to Eocene Earth, with warm temperatures throughout the entire planet, even at the poles, and things like snow being an oddity.

The body has a 36-hour day-night cycle

Orbit is somewhat elliptical around both main stars, and so seasons are extreme

The orange dwarves are 6 billion years old, the brown dwarf is 8 billion. Judecca, the brown dwarf, was captured 2.35 billion years ago.