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In order to be able to determine in a simple manner the angular deviations between the optical axes (OT, OS) of a telescope lens (2) and of a star tracker lens (8) which arise during the course of operation of a space telescope due to external influences, the entry (7a) of an orderly arranged light

In order to be able to determine in a simple manner the angular deviations between the optical axes (OT, OS) of a telescope lens (2) and of a star tracker lens (8) which arise during the course of operation of a space telescope due to external influences, the entry (7a) of an orderly arranged light conductor bundle (7) is arranged in the focal plane (ft) of the space telescope lens (2) and the exit (7b) of the light conductor bundle (7) is lead into the focal plane (fk) of a collimator (9) arranged in the object-side opening of the star tracker lens (8). The angular deviation is determined by comparing the coordinates (yo, zo, y′o, z′o) of the images (S, S′) of a reference star arising in the space telescope and in the star tracker. The collimator (9) may be mounted at the edge of the star tracker opening and a prism system (10, 11) may be provided for reflecting or imaging its beam path into the beam path of the star tracker.

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A space telescope connected to a star tracker, comprising a telescope lens, an instrument platform orientable toward a reference star by means of said star tracker, optical means arranged for transmitting images projected from said telescope lens into a beam path of the star tracker, said optical me

A space telescope connected to a star tracker, comprising a telescope lens, an instrument platform orientable toward a reference star by means of said star tracker, optical means arranged for transmitting images projected from said telescope lens into a beam path of the star tracker, said optical means including a collimator lens and an orderly arranged light conductor bundle (7) having an entry end arranged in the focal plane (ft) of said telescope lens (2), said light conductor bundle having an exit end (7b) leading into the focal plane (fk) of said collimator lens (9) arranged on that side of a star tracker lens (8) which faces an object.