eksaktuun

Eksaktuun is a fictional terrestrial planet that appears in science fiction literature, role-playing campaigns, and world-building guides. The name derives from a constructed language spoken by its inhabitants and is commonly interpreted as "precision" or "exactness."

In its canonical setting, Eksaktuun orbits a small red dwarf in the hypothetical Gliese-9 system, at a distance of about 0.9 AU. It completes an orbit every 210 days and has a modest orbital eccentricity, resulting in mild seasonal changes.

The planet's radius is about 0.95 times that of Earth and its mass roughly 0.9 Earth masses, giving a surface gravity near 0.92 g. The atmosphere is thin, with a surface pressure near 0.8 atm, composed primarily of nitrogen and oxygen with trace greenhouse gases. The surface is dominated by basaltic plains, shielded by a few highland regions and polar ice caps.

Temperate climate with regional variation; average global temperature around 12-15 C (284-289 K). Weather features include strong katabatic winds from highlands and seasonal polar freeze-thaw cycles.

Indigenous life remains unconfirmed within the source material; existing expeditions have found no conclusive biosignatures in the upper atmosphere or surface samples. Subsurface ice and mineral deposits are identified as potential resources for future exploration.

Eksaktuun has influenced in-universe science and culture, becoming a reference point for discussion of measurement precision and calibration in fictional astronomy and engineering texts. It also appears as a setting for several novels and game campaigns.