Artificial star

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In astrometry and astrogeodesy, an artificial star is a fine beam of light that serves as a directional reference ( Mire ) or to determine the reaction time ( personal equation ), as occurs when a star is visually observed .

The first area of ​​application can also be carried out with a collimation telescope and illuminated crosshairs , while the second requires precise control of the movement (apparent star speed in the field of view ) and automatic time registration at several points on the movement path. A point light source with movement registration is therefore used here.

In general, the artificial star can also be regulated in terms of its brightness , because the reaction time for observations through weaker stars is slightly longer than for bright ones.

In large astronomical telescopes, an artificial guide star is a bright spot of light generated with a laser telescope in the stratosphere, which can be used to control adaptive optics .

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