Sisera (moon)

Sisera

Orbital characteristics
Mass (Kg)
Radius (Km)
Solar Day (h)
Orbital Period (days)
Semi-Major Axis (Km)
Periapsis (AU)
Apoapsis (AU)
Albedo
Surface Temperature (K)
Surface Gravity (m/s^2)
Axial Tile (degrees)
Inclination (degrees)
Orbital Speed (Km/s)
Satellites	None

Sisera is the second of the three major moons of the planet Nephele.

North Polar Regions

A labelled map of the surface of Sisera.

The surface of Sisera, unlabelled.

The North Polar Regions of Sisera are marked by wide, frost-bright ice fields, deeply incised scarps, and rough elevated terrain gathered beneath prolonged cold and recurring darkness. Across the far northwestern margin, the subdued tract called Veyra Verge occupies one of the quieter transitional zones between the high polar ice and the darker exposed ground below. East of this, the pale and haze-softened northern field known as Echoward Veil stretches across a broad zone of frozen terrain, where bright material appears layered over rougher underlying relief and long accumulations of ice soften the sharper features of the landscape. Toward the north-central and northeastern hemisphere, the great upland mass designated Delphion Crown dominates much of the visible polar interior, standing out as the clearest large-scale northern prominence on the moon. Farther east, the elevated formation called Anteros Rise breaks distinctly from the surrounding darker ground, while the fractured system known as Mirrorkeep Fossae marks one of the more visibly broken and structured zones along the edge of the northern polar province.

The overall character of the north is severe, reflective, and ancient. Thick ice sheets, stratified accumulations, exposed rocky interruptions, and occasional vent-related frost activity give the region a more articulated surface than a simple frozen cap. This is also the part of Sisera where the moon’s introspective symbolic language feels most naturally anchored to geography: the stillness of Echoward Veil, the commanding cold uplift of Delphion Crown, and the fractured austerity of Mirrorkeep Fossae distinguish the principal northern environments within the broader polar terrain. In mapped usage, these names help separate the quiet veil-like ice fields from the higher northern plateau and the broken fissured margins that frame them.

Equatorial Regions

The Equatorial Regions of Sisera contain the broadest range of terrain on the moon. Large dark basaltic surfaces, lighter sandy tracts, crater fields, and scattered inactive volcanic structures dominate much of the belt, giving the equatorial zone a mixed and heavily worked appearance from orbit. Across the western equatorial reaches, the smoother and more open tract known as Stillwater Planitia stretches across one of the clearest lighter provinces on the moon, while the adjacent circular depression called Veilbearer Basin stands out as one of the most distinct impact features in the western half of the map. At the center of the moon’s middle latitudes lies the Siseran Expanse, a broad equatorial province whose alternating pale and dark surfaces give Sisera much of its recognizable visual character. Cutting across the upper middle latitudes is the long dark break called Reflective Chasma, applied to one of the clearest linear depressions visible on the mapped surface. Farther east, the transitional dark-and-light zone known as Lacuna Reach marks the gradual shift into rougher cratered ground, beyond which the sharply broken escarpment called Delphic Scarp defines one of the most abrupt terrain transitions in the eastern equatorial belt.

The combination of cratered terrain, dark volcanic-looking plains, lighter dusted expanses, and old structural breaks gives the equatorial regions a layered and complex appearance. Dust movement, exposure of older basalt, and the preservation of ancient impacts all seem to have contributed to the region’s visible diversity. These processes appear to have left some surfaces muted and open, while preserving sharper crater rims, darker plains, and more abrupt scarps elsewhere. The named regions reflect that same complexity: Stillwater Planitia and the Siseran Expanse denote the broad open terrain, Veilbearer Basin and Reflective Chasma correspond to major enclosed and linear depressions, and Lacuna Reach with Delphic Scarp help distinguish the eastern transition from smoother equatorial ground into harsher broken relief. Taken together, the equatorial regions give Sisera much of its orbital identity: a cold, cratered moon whose central belt preserves both geologic violence and later quieting.

Southern Polar Regions

The Southern Polar Regions of Sisera are brighter and more dynamic in appearance than much of the north, with wide ice-rich formations extending across the lower hemisphere and interacting visibly with crater walls, rocky uplands, and broken depressions. Across the southwestern margin, the broad reflective tract known as Lake-of-Mirrors Shelf occupies one of the clearest southern ice provinces, where smooth bright surfaces appear pooled and gathered across lower ground. North of the southernmost ice, the muted depression called Halcyon Hollow forms a darker transitional basin between exposed ground and the more reflective terrain below. Toward the southeast, the enclosed bright-and-shadowed field known as Vigil Basin stands out as one of the most visually distinct southern polar structures, while the broken terminal fracture zone called Nyarion Rift marks one of the clearest disrupted margins descending toward the far southern edge of the map.

The southern polar zone has a more visibly active texture, shaped by the interplay of glacial flow, partial melting, refreezing, and geothermal influence. Bright material appears pooled in hollows and spread across smooth basins, while darker protrusions and cratered ridges interrupt the ice in long arcs and scattered masses. Some areas suggest repeated reshaping through shifting flows and subglacial disturbance rather than simple static accumulation. These southern formations therefore give Sisera a more dynamic lower hemisphere than the north, even while the overall environment remains cold and austere. In mapped usage, Lake-of-Mirrors Shelf, Halcyon Hollow, Vigil Basin, and Nyarion Rift help distinguish the principal shelf, transition basin, enclosed bright depression, and fractured polar margin within this broader southern glacial environment.