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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 57, Iss. 1 — Jan. 1, 1967
  • pp: 44–47

Optics InfoBase > JOSA > Volume 57 > Issue 1 > How Large is a Point Source?

How Large is a Point Source?

ARTHUR C. HARDY  »View Author Affiliations


JOSA, Vol. 57, Issue 1, pp. 44-47 (1967)
http://dx.doi.org/10.1364/JOSA.57.000044


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Abstract

A source of light having many times the angular subtense of the sun or moon can usually be treated as a point when making photometric calculations based on the inverse square law. When viewed by the eye, such sources are not perceived as points (like stars) but rather as extended surfaces. In this paper, some typical data on contrast thresholds for targets, both large and small, are converted into threshold stellar magnitudes. This is done for two important cases which, unless carefully distinguished, can lead to erroneous results.

Citation
ARTHUR C. HARDY, "How Large is a Point Source?," J. Opt. Soc. Am. 57, 44-47 (1967)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-57-1-44

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