Eidolon
Overview
The Eidolon Star System is a scientifically compelling and astrophysically diverse planetary system situated approximately 8.9 light-years coreward of Sol, slightly north of the galactic plane. At its center lies a G7V main-sequence star—marginally smaller and cooler than the Sun—possessing 0.81 solar masses, 0.85 solar radii, and radiating at roughly 49% of the Sun's luminosity. This subdued stellar output casts a warm, golden hue that subtly influences the thermal profiles and atmospheric behaviors of the surrounding worlds.
Eidolon comprises ten major planets, ranging from compact, superheated terrestrial bodies to vast gas and ice giants, alongside two distinct asteroid belts. The system’s structure reflects a dynamic but orderly formation history, featuring compact orbital spacing modulated by resonance gaps and stable gravitational zones. These elements together foster long-term orbital coherence while supporting a range of planetary environments.
In the inner system, several rocky planets orbit close to the star. These bodies, exposed to intense irradiation, are characterized by high surface temperatures, metallic crusts, and minimal atmospheres. Farther out lie two terrestrial planets—Virelya and Sephira—that occupy the system's temperate zone. Each presents surface conditions that verge on habitability, with one being largely arid and the other a global ocean world. Beyond them lies the Ereskal Belt, a dense aggregation of rocky debris likely representing remnants of early planetary formation.
Progressing outward, the system transitions into domains dominated by massive gas and ice giants, each exhibiting distinct chemical compositions and meteorological structures. These planets anchor intricate systems of moons and, in some cases, possess thin but extensive ring systems. The outermost structure, the Vennor Belt, is a vast and diffuse region populated by icy bodies, dwarf planets, and long-period comets. This belt serves as a cold reservoir of primordial material, shaped by the gravitational Influence of the outer giants.
The Eidolon system offers a fertile ground for comparative planetary science. Its varied thermal regimes, diverse atmospheric chemistries, and dynamic orbital relationships make it an exemplary model for understanding planetary system evolution around G-type stars. From the molten terrain of its innermost planet to the cryogenic frontier of its outermost debris field, Eidolon encapsulates a broad spectrum of planetary phenomena.
Maps
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Eidolon System
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Eidolon - Inner System Focus
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