IMAGE MOTION AS A MEASURE OF SEEING QUALITY

Relations between image centroid motion and large-telescope long-exposure image size are given for the cases of absolute motion measured with a single aperture and differential motion measured with two apertures. The effect of a finite exposure time in the measurement of image positions is included...

Full description

Saved in:
Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1987-12, Vol.99 (622), p.1360-1370
Main Author: MARTIN, H. M.
Format: Article
Language:English
Subjects:
Astronomy
Atmospheric layers
Centroids
Earth, ocean, space
Exact sciences and technology
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
Kinetics
Light refraction
Observation and data reduction techniques. Computer modeling and simulation
Telescopes
Turbulence
Wave fronts
Wind direction
Wind velocity
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Relations between image centroid motion and large-telescope long-exposure image size are given for the cases of absolute motion measured with a single aperture and differential motion measured with two apertures. The effect of a finite exposure time in the measurement of image positions is included in the analysis, and is shown to be of crucial importance, especially in the measurement of differential image motion. For example, the contribution of the free atmosphere to the mean square differential motion can be underestimated by more than a factor often in realistic circumstances if an exposure time of 1/30 s is used.
ISSN:0004-6280
1538-3873
DOI:10.1086/132126