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Table 24

Allowed values of RADESYSa.

Value Definition

ICRS International Celestial Reference System
FK5 Mean place, new (IAU 1984) system
FK41 Mean place, old (Bessel-Newcomb) system
FK4-NO-E1 Mean place: but without eccentricity terms
GAPPT Geocentric apparent place, IAU 1984 system



New FITS files should avoid using these older reference systems.

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