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A CAUTIONARY NOTE ON CONVERSIONS BETWEEN GALACTIC AND EQUATORIAL COORDINATE SYSTEMS

ADAIR P. LANE
Publications of the Astronomical Society of the Pacific
Vol. 91, No. 541 (June 1979), pp. 405-407
Stable URL: http://www.jstor.org/stable/40677409
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A CAUTIONARY NOTE ON CONVERSIONS BETWEEN GALACTIC AND EQUATORIAL COORDINATE SYSTEMS
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Abstract

The conversion between equatorial (α, δ) and new galactic (l, b) coordinate systems involves the straightforward application of an IAU definition and some basic spherical trigonometry. Unfortunately, the common reference books (e. g., Allen 1973; Kraus 1966) do not quote the definition correctly and frequently copied computer algorithms (e. g., Ball 1969; Manchester and Gordon 1970), having incorporated this error, lead to an inconsistent forward-backward conversion and to errors of as much as one arc minute. We present here the source of these errors and accurate parameters for use in general conversion routines.

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