Star Magnitude Extinction An Approximate Method For Calculation Experienced by Astrotracker Systems

Gregory L. Matloff

doi:10.1117/12.7971504

1 May 1969 Star Magnitude Extinction An Approximate Method For Calculation Experienced by Astrotracker Systems

Gregory L. Matloff

Author Affiliations +

Optical Engineering, Vol. 7, Issue 4, 704119 (May 1969). https://doi.org/10.1117/12.7971504

Abstract

Using an equation which has been derived for the variation of apparent star magnitude with star angular altitude, observer station height, star spectral radiance, sensor spectral sensitivity, assumed theoretical values for Rayleigh (pure air) scattering, typical clear sky Mie (large particle) scattering, and Ozone absorption for 18°C temperatures, calculations have been performed for various sensor and star types. A typical result obtained using this method to calculate the total magnitude extinction for an Ao star observed at the Zenith by a 7 sensor at a station height of 1130 ft. is 0.31 magnitude, which compares to the result obtained experimentally by R. H. Hardie at Dyer Observatory, of 0.25 ± 0.02 magnitude. Other similar results are presented.

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Gregory L. Matloff "Star Magnitude Extinction An Approximate Method For Calculation Experienced by Astrotracker Systems," Optical Engineering 7(4), 704119 (1 May 1969). https://doi.org/10.1117/12.7971504

Published: 1 May 1969

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