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RE: FITS celestial coordinate keywords.

Bill Pence writes: 

> The local OGIP FITS Panel has been attempting to invent some multi-mission
> FITS keywords to represent the celestial position of astronomical data
> sets.  The following keywords have been proposed; any comments,
> complaints, or suggestions about this choice of keyword names are
> welcome.

>				...

> RA_OBJ    /  position of the object specified by the OBJECT keyword (degrees)
> DEC_OBJ   /

> RA_NOM   / nominal pointed position of the observation (degrees)

>...[other proposed keywords]

How would these conventions be used together with the Workd 
Coordinates projection conventions, (e. g. RA---TAN)?

					Barry Schlesinger
					FITS Support Office