Science reference
Planetary reference
Physical parameters and geometric context for mission planning and interpretation. The reference environment is separate from a local weather or exposure assessment.
| Quantity | Reference value | Context |
|---|---|---|
| Planet mass | 0.92 Earth masses | Reference planetary parameter |
| Planet radius | 1.02 Earth radii | Earth mean-radius convention |
| Surface gravity | 8.68 m/s² / about 0.89 g | Derived from mass and radius |
| Orbital period | 38.64 Earth days | Sidereal orbital reference |
| Rotation | Prograde 1:1 synchronous | One rotation per orbit |
| Axial obliquity | 0° | Reference geometry |
| Orbital eccentricity | 0.002 | Small variation in host direction |
| Semimajor axis | 0.1675 AU | Reference orbital separation |
| Natural satellites | None | Moon-free reference system |
| Atmospheric reference pressure | 1.5 bar | Total pressure; not exposure clearance |
| Host mass | 0.42 solar masses | Reference stellar parameter |
| Host effective temperature | 3,500 K | Reference stellar parameter |
| Incident stellar flux | 0.85 of Earth’s | Top-of-atmosphere orbital reference |
Units use Earth and solar reference quantities where stated. Surface gravity is rounded for public description; the absolute value uses the mass and mean-radius calculation.
Synchronous rotation
One rotation accompanies each orbit. This does not produce Earth’s ordinary sunrise and sunset cycle. Background celestial directions still change over the orbital period; a starfield is not fixed simply because the host remains nearly stationary.
Atmospheric reference
The dry reference mixture is 86.7% nitrogen, 12% oxygen, 1% argon and 0.3% carbon dioxide by mole fraction, at a total pressure of 1.5 bar. Water vapour and local conditions require separate assessment. A pressure or oxygen fraction alone does not establish suitability for unprotected crew exposure.
Geometry is not climate
The reference incident flux does not determine surface temperature. Clouds, circulation, atmospheric composition, ice and ocean transport affect local conditions. The reference system does not establish a validated climate or guarantee a warm, open-water night-side habitat.
Sky references
The mission uses its own documented reference frame. Heritage sky imagery and pre-Break catalogues cannot be assumed to reproduce the local sky without a defined transformation. No catalogue starfield is presented on this website.
Reference calculations and limits →
Scientific interpretation →