Titan

Atmospheric-body navigation models render predicted views of bodies whose visible “limb” is a haze top rather than a solid surface (Titan, Venus, Triton’s nitrogen frost layer at low phase) and emit feature types tailored to that geometry. All concrete subclasses derive from NavModel directly; the family has no shared abstract base because no full implementation is registered.

Registered concrete subclasses:

• NavModelTitan — registered placeholder for haze-aware atmospheric-body navigation; emits no features. Documented at Titan Navigation Model.

• NavModelTitanSimulated — reserved without an implementation. The simulated-image GUI variant would render a haze-bounded disc from operator-supplied parameters. Documented at Simulated Titan Navigation Model.

Atmospheric-body navigation is conceptually distinct from ellipsoid-limb fitting: the optical limb is the haze top (which moves with wavelength), phase angle changes the apparent limb shape because forward-scattered haze brightens differently from back-scattered haze, and the haze altitude varies with latitude, season, and (on Titan) year-by-year atmospheric circulation. The placeholder reserves the registry slot for a haze-aware extractor; while the slot is unfilled, Titan-class scenes navigate against any other body, ring, or star in the FOV without a Titan-derived contribution.

• Titan Navigation Model
  • Overview
  • Theory
    • Restrictions and assumptions
    • Sources of uncertainty
  • Configuration
  • Implementation
  • Examples
• Simulated Titan Navigation Model
  • Overview
  • Theory
    • Restrictions and assumptions
    • Sources of uncertainty
  • Configuration
  • Implementation
  • Examples