Agnis
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| Orbital characteristics | ||
| Mass (Kg) | 7.97E+22 | |
| Radius (Km) | 1,415 | |
| Solar Day (h) | 14.2 | |
| Orbital Period (days) | 10.5 | |
| Semi-Major Axis (Km) | 1,271,333(km) | |
| Periapsis (AU) | .009 | |
| Apoapsis (AU) | .009 | |
| Albedo | .35 | |
| Surface Temperature (K) | 136 | |
| Surface Gravity (m/s^2) | 2.74 | |
| Axial Tile (degrees) | 3.7 | |
| Inclination (degrees) | 0 | |
| Orbital Speed (Km/s) | 25.9 | |
| Satellites | None | |
Agnis is the third of the three known, major moons of Chrysos.
North Polar Regions
The North Polar Regions of Agnis are dominated by an extensive polar ice cap broken by dark exposed terrain, fractured margins, and deeply incised troughs. The ice sheet covers the highest latitudes in a broad continuous mass, but its outer edge is uneven and heavily disrupted, with steep scarps, fissures, embayments, and isolated dark basins cutting into the frozen cover. In the northwestern transition zone, the broken icy uplands known as the Veiled Passage Marches mark one of the clearest thresholds between permanent frost and darker exposed ground, a fitting name for a region of fractured passageways and cold-trap basins near the polar edge. Farther east, the upland sanctuary-like province called the Hall of the Last Bastion occupies one of the more elevated and stable sectors along the northern ice margin, while the boundary tract known as the Helaenic Verge forms a stark transition from polar ice into the darker and more impact-marked terrain below.
In several sectors the polar terrain includes enclosed depressions and roughened uplands, giving the region a strongly broken and glaciated character. One especially prominent northern basin is the Kedemon Basin, a dark circular depression set just below the polar margin, while the central-northern caldera-like rise known as the Nyxian Crown stands out farther south as one of the most visually dominant interior features associated with the northern transition belt. Along the lower edge of the cap, the frozen surface gives way to darker volcanic and impact-marked ground. Craters, buried rims, and broad lowland plains remain visible beneath thin mantling and wind-spread surface deposits. One notable sector of the northern transition zone includes a concentrated field of sharp, bright ice pinnacles and fractured cold-trap terrain, standing out from the broader polar sheet as one of the most rugged icy landscapes on the moon.
The northern hemisphere is defined by the contrast between permanent polar ice and the darker underlying crust. Frozen deposits dominate the highest latitudes, while exposed rocky plains and cratered surfaces become increasingly common toward the equatorial belt. In mapped usage, that contrast is best expressed through the Veiled Passage Marches, Kedemon Basin, Hall of the Last Bastion, Helaenic Verge, and the Nyxian Crown, which together distinguish the most important glaciated, uplifted, and enclosed northern terrains on Agnis.
Equatorial Regions
The Equatorial Regions of Agnis are dominated by dark plains, broad expanses of golden surface material, impact basins, and volcanic landforms. Much of the middle latitudes consist of low-reflectivity terrain interrupted by sweeping fields of pale yellow dust or frost-stained sediment spread across wide basins and plains. These lighter deposits form broad contiguous provinces, especially across the central and eastern equatorial belt, and sharply divide the darker exposed ground into irregular volcanic and impact-marked zones. The broad central province is now commonly designated the Agnision Expanse, a name used for the moon’s most extensive low-reflectivity equatorial terrain. Within this larger province, the transitional belt called the Thyrean Reach occupies part of the central-to-eastern golden field, where pale material spreads across and between darker volcanic plains and impact-marked ground.
Several major craters and volcanic-looking depressions are visible across this region. Large circular basins with dark floors and raised rims occupy parts of the eastern equatorial zone, while smaller crater fields and degraded impact structures are scattered across the rest of the belt. The most imposing of these eastern structures is Patera Revoltus, a large volcanic-looking depression embedded in one of the moon’s brightest equatorial fields. To its east, the sharp boundary known as Mistress’ Threshold marks a transition into more broken and locally uplifted terrain. South of this, the fractured system called the Lost Souls Fossae cuts across the lower eastern belt in branching troughs and broken lineaments. In the west, the elongated trenchlike sector called Catacombs Chasma cuts through darker exposed ground, while farther southwest the broad dark lowland known as the Abyssal Plain of Agnis forms one of the largest uninterrupted expanses of shadowed terrain in the equatorial zone.
Darker plains in the western and central low latitudes are crossed by long streaks and diffuse plumes of lighter material, suggesting sustained transport and redistribution of fine surface deposits. That process is especially evident around the sheltered depression called the Hollow of Black Candles and the nearby Confession Basin, where lighter mantling gathers against rougher ground and basin edges. The equatorial belt contains the broadest uninterrupted exposures of Agnis’s rocky surface. It is also the most varied region of the moon, combining cratered lowlands, dark volcanic plains, dust-covered basins, and localized areas of brighter material around impact and tectonic features. In mapped usage, the Agnision Expanse, Thyrean Reach, Patera Revoltus, Mistress’ Threshold, Lost Souls Fossae, Catacombs Chasma, Abyssal Plain of Agnis, Hollow of Black Candles, and Confession Basin together provide a more detailed vocabulary for the central surface of Agnis.
Southern Polar Regions
The Southern Polar Regions of Agnis are covered by an extensive ice mass that is broader and more fragmented than the northern cap. Large sections of the south polar terrain consist of continuous frozen plains, broken shelves, enclosed icy basins, and fractured margins where the ice meets darker exposed ground. The southern polar zone also contains embedded rocky uplands, crater rims, and isolated darker masses rising through the frozen cover. Along the central southern margin, the icy apron called the Fallen One Shelf forms one of the clearest broad shelf-like deposits on the moon, while farther west the pale and wind-spread zone called the Revenant Drift marks a lower, more diffuse field of redistributed frost and fine material.
The transition between the southern ice and the lower latitudes is highly irregular. Ice fills depressions, spreads into channels and troughs, and gathers in broad apron-like deposits along the edges of rough terrain. In several areas, exposed rock and dark plains remain visible within the polar region itself, creating strong contrast between white frozen surfaces and the darker crust beneath. This pattern is especially evident near the geothermal transition belt, where the vent-marked region called Shadowkeeper Fumaroles occupies part of the southern mid-latitude boundary and ties directly into the moon’s documented localized geothermal zones. Nearby, the steep edge known as the Thorncrown Scarp marks one of the clearest southern escarpments, where darker rocky ground and pale shelf-like ice meet along a sharp boundary.
The south has a more complex and broken glacial structure than the north, with broad lowland ice, exposed rocky interruptions, and several enclosed basins suggesting long-term accumulation across uneven terrain. Together, the southern high latitudes present Agnis as a moon of permanent ice, dark underlying plains, and heavily scarred polar margins. In mapped form, the Fallen One Shelf, Revenant Drift, Shadowkeeper Fumaroles, and Thorncrown Scarp define the most important southern transitions between broad glacial cover, darker exposed crust, and the chemically active frost-stained terrains that distinguish Agnis from more inert icy moons.
Unusual Qualities
Agnis contains several localized geothermal zones beneath the southern transition belt, where buried heat sources interact with overlying frozen ground. These regions are associated with warm ice caverns, shallow vent fields, and chemically active frost deposits that stain nearby terrain in pale gold, rust, and faint green-grey tones. The most unusual of these deposits occur where mineral-rich vapors rise through cracks in the crust and condense at the surface, leaving bright halos and irregular colored mantling around vents, crater rims, and fractured ground.
Although Agnis is cold overall, these geothermal pockets create small but persistent zones of internal activity. In some areas, subsurface heat weakens the overlying ice and regolith enough to produce collapse pits, thawed cavities, or unstable crust over enclosed chambers. These features are limited in extent, but they distinguish Agnis from more geologically inert icy moons and help explain the patchwork of golden and darker surface materials seen across parts of the moon.
