Ea

Ea, formerly called TRAPPIST-1, is named for the Babylonian god associated with its constellation Aquarius.

Enbilulu
Once called TRAPPIST-1e, Enbilulu is the sole habitable Ean world and hosts several million humans altered far off baseline to survive the partly terraformed planet, one of the larger human presences outside of the Sol system. A massive magnetic deflector shield sits at the world's Lagrange 1 point protecting it from Ea's frequent solar flares. It is characterized by gravity slightly lesser than Earth's and, being tidally locked to its star, has wildly varying temperatures on its inward and outward facing hemispheres. Its year and day are the same length and measure 146 hours long or just over six Earth days. Since Ea never appears to traverse the sky from any point on the surface, time is kept by the passage of the small dark moon Haddad which itself is tidally locked to Enbilulu and orbits it every eight days. It is theorized that Enbilulu cannot host any larger satellites as they would have more distant orbits and be stolen by Ea's gravitational pull.

Usumu
A gas giant with an eccentric elliptical orbit and the last Ean world to be discovered by Earth's astronomers, its atmosphere fuels interstellar voyages to other human systems as well as colonization missions deeper into the galaxy. It is believed to not be "native" to Ea but rather captured from a passing star billions of years ago.

Inhabitants
The Ean system is also host to several hundred thousand Raselhagueans, the majority of whom reside in the mining operations on the icy world of Marduk in its main settlement of Nabonidus.