Charted in the 2150's, Tau1 Gruis possessed a large, Jupiter-class planet with 1.2 times the mass of Jupiter. Two large moons

orbited about Tau Gruis B. These two moons were the size of planets, the largest one was named Hydra1 and the smaller one was

named Hydra2. The orbital dynamics of these two moons were quite remarkable, they  had settled into the same orbital path around

Hydra and were separated by 30 degrees in their orbit. This Lagrange point separation  proved to have long-term orbital stability as

well as providing two habitable planets relatively close to one another. There were also two other smaller, habitable moons in a more

distant orbit about Hydra with diameters of 5,700 Km and 4,800 Km respectively named Hydra3 and Hydra4. These two lesser

moons, though very large by sol system standards, contained desert-like conditions with low levels of oxygen and small rugged plants.

H1 and 2 were worlds that possessed larger amounts of water than H3 and 4, with H1 having a warmer climate because of it's higher

atmospheric CO2 levels and H2 having a wetter climate than H1. Both moons possessed varied lifeforms and rich ecosystems,

with H2 having somewhat more arctic life since it's atmosphere allowed for larger climate variations as Tau Gruis B  moved to

it's aphelion in it's orbit. With two very hospitable worlds and two semi-hospitable ones in orbit around Hydra, this system became a

focal point for colonization. They also provided an excellent study of varying exobiology under similar planetary environments.

From the surface of Hydra 1, Hydra 2 and Tau Gruis B dominate Hydra 1's sky.

Diameter: 8,100 - 10,200 KM

Parent Star: Tau1 Gruis  Type: G0 Yellow Dwarf

Parent Planet: Tau1 Gruis B or TGB

Distance from Earth: 108.6 light years

Atmosphere: Oxygen/Nitrogen

Gravity: .6 - .8 (Earth = 1)

Life: Varied Plant and animal life under a large range of planetary climates.

Colonized Worlds

Habitable exoplanet, Tau 1 Gruis, exoworlds, moon, habitable moon

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