Æthereal Sun Wiki

Úmbra is the sixth major celestial object around Lumenoferos. Despite being on a more distant orbit than Vel, Úmbra has a much hotter climate. This is due to its extremely dense atmosphere, which produces a greenhouse effect.

Between the high temperature, an atmospheric pressure that is comparable to that of the deepest underwater trenches of Etéra, and a mildly corrosive composition of the atmosphere, Úmbra is an extremely hostile environment that only specialised craft can explore, preferably without staying too long. While there are semi-regular research and prospecting expeditions to the planetary surface, so far most mining guilds tasked with large-scale extraction of any noteworthy deposits lean towards considering the process too expensive, difficult and risky to be worth it, even for highly exotic alchemicals.

The planet's name comes from a reference to shadow in a now-dead language, an allusion to an ancient tale that it's the furthest planet from the sun that is always shadowed from its light by one of its siblings.

Planetary Parameters[]

mean distance     2.2 au
perihelion        2.0 au
aphelion          2.4 au
axial tilt        20°
annual period     1183.5 Etéran days, 4734 local days.
local day         6.0 hours
mass              3.51 (2.096e25 kg)
diameter          1.6 (2e7 m)
density		  0.8 (4.4 g/cm³)
surface gravity   1.3 (13 m/s²)
escape velocity   16 km/s

vulcanism         moderate
tectonics         light
climate           infernal
average           269°C (542 K)
periphelion       279°C (552 K)
aphelion          261°C (534 K)
illumination      0.16
hydrographics     5% (water)
tidal range       0.09m
composition       N2, CO2, H2O, and others
pressure          98 MPa (98,300 kPa)