The upcoming JAXA Epsilon medium-class mission, DESTINY+, aims to flyby multiple asteroids including Phaethon.The mission's flyby observation instrument, TCAP, is a telescope capable of single-axis rotation.TCAP is also used as a navigation camera for autonomous optical navigation during the closest-approach phase.A proposed algorithm utilizing the unscented Kalman filter can mitigate misalignment-induced degradation of the optical navigation accuracy.