Rocheworld planets

*Sourced from ROCHEWORLD by Robert L. Forward.*
Until I get my hands and brain on the sequels, the information here will be unfinished, as I've only read the first book.

GARGANTUA:
A giant planet four times the mass and three halves the density of Jupiter.
Larger rocky core than Jupiter.
Seven-day rotation period results in Earth-like weather patterns and minimal cloud banding.
There is an atmospheric volcano on the south pole.
Emits more heat than it receives.
Surface temp near freezing point of water... perhaps white water clouds with ammonia and tholin smog in colder spots?
Many giant cyclones spawned at the equator which move north.


Its moons, in decreasing size order: Zapotec, Zouave, Zulu, Zuni, Zion, Zen, Zoroaster, Zwingli, and Zeus.
Its minor moons are named with a Z-number, such as Z1, Z2, Z3. Some are interesting enough for proper names: Zinc, Zoo, Zygote, and Zipcode.

It is hard to tell the order of the satellites given that the initial flyby pass is out of order. It is rather a shame that the epilogue of the book, a hearing presented by scientists about the Prometheus expedition, does not include more detailed information about these worlds.

Zeus: a small moon. Outermost dwarf moon.
Zapotec: Larger than Mercury, with a Mars-like atmosphere and surface. Volcanic chain ringing the south pole. Equatorial rift valley going 200 degrees around the planet, 15km deep. Outermost large moon.
Zen and Zion: Two planetoids within the orbit of Zapotec. Possible coorbital.
Zouave: Orange hazy titan-like world. "All up and down, no flat areas to indicate seas." Too warm for liquid methane. Water/CO2 snow covers the surface with a smoothly rolling landscape. Three atmospheres.
Zuni: A little larger than Earth's moon. Has a thick atmosphere. 40 degrees celsius. Water clouds and thunderstorms. Solid rocky surface with lots of shallow liquid water lakes. Strange colors, perhaps picked up from smog from Zouave (reddish/orange tholins?). A miniature Earth, would later be called Eden.
Zulu: Innermost large moon. Somewhat like Ganymede. Thick layer of striated ice over a deep ocean. But very tectonically active, with ice geysers. As active as Io. Extremely powerful magnetic field, around 100 times stronger than Earth's. Possibly surrounded by a gas torus. It has an atmosphere thick enough to allow for liquid rain to fall from the geysers.
Zoroaster and Zwingli: Coorbital minor moons in a horseshoe orbit.