Star orbit

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Trace recording with two satellite orbits

A star orbit is the track that a fixed star draws through the field of view of a telescope as a result of the earth's rotation or leaves on the photographic film or the CCD sensor of a camera . Sometimes it is also understood to mean the apparent path of a star relative to the neighboring objects in the starry sky . Star orbits are a special form of orbital lines and are approximately circular in photographic imaging.

Measurements on apparent star orbits

In astronomy and geodesy , such star orbits are measured with precision instruments - depending on the effort and purpose with accuracies of 1 ″ down to 0.01 ″, with astrometric satellites even up to 0.001 ″. These measurements can be made:

The measurement of apparent star orbits is the basis of many astrometry and astrogeodesy methods - regardless of which of the above methods is used to observe the passages. In space travel , too , analyzes of recorded star trails are sometimes an aid for localization or course correction .

Other uses

The apparent movement of stars also serves other purposes, such as

See also


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