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Images of both rotating celestial bodies (e.g., asteroids) and spheroidalplanets with banded atmospheres (e.g., Jupiter) can contain features that arewell-modeled as a circle of latitude (CoL). The projections of these CoLsappear as ellipses in images collected by cameras or telescopes onboardexploration spacecraft. This work shows how CoL projections may be used todetermine the pole orientation and covariance for a spinning asteroid. In thecase of a known planet modeled as an oblate spheroid, it is shown how similarCoL projections may be used for spacecraft localization. These methods aredeveloped using the principles of projective geometry. Numerical results areprovided for simulated images of asteroid Bennu (for pole orientation) and ofJupiter (for spacecraft localization).

Pole Estimation and Optical Navigation using Circle of Latitude Projections