Artificial star
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 .
literature
- K. Ramsayer, 1969: Geodetic Astronomy , Volume IIa of the Handbook of Surveying, Chapter 49 (Errors in Star Observation), JB Metzler-Verlag Stuttgart.
- Refractory construction (Section 7), artificial Laser star