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Mass Effect 2 Planetary Database: Entry Details
Zeona
System: Ismar Frontier
Cluster: Elysta
Anomaly/Landable: Yes
Installation: Firewalker Pack DLC
Orbital Distance: 0.64 AU
Orbital Period: 0.6 Earth Years
Radius: 4,734 km
Day Length: 49.6 Earth Hours
Atmospheric Pressure: 0.55 Earth Atmospheres
Surface Temperature: 68 Celsius
Surface Gravity: 0.57 G
Zeona has a thin atmosphere of sulfur dioxide and trioxide, created by volcanic outgassing. There are traces of water vapor in the atmosphere, but over the last five centuries of observation particle counts have decreased 4%.

While not habitable by any spacefaring species, there is an abundance of native sulfur-devouring bacteria that thrives around the world's many volcanic vents. Interestingly, these bacterium bear genetic similarities to the native life of Illium, suggesting either a "panspermia" spread of microbes via asteroids, or accidental contamination of the original environment by careless spacefarers.