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On 17 June 2012 23:11, Tim Jenness <[log in to unmask]> wrote: > If you converted from FITS then the epoch header should have been > filled in from the DATE-OBS header originally. The DATE-OBS in the > FITS header is just a memory of the original FITS header rather than > an expression of the WCS. I assume the header in this case did not > come from a FITS file. Yes it did. The NDF produced from the original FITS file has the right DATE-OBS but the EPOCH is missing (I think it was absent from the FITS headers). However, when I convert back to FITS this strange DATE-OBS is added. I'll try to get one of the original FITS files in case this is useful. Eduardo -- Eduardo Unda-Sanzana Research (in English): http://research.almagesto.org Personal (in Spanish): http://eduardo.almagesto.org "Solamente lo barato se compra con el dinero" (A. Cortez) ---- Starlink User Support list For list configuration, including subscribing to and unsubscribing from the list, see https://www.jiscmail.ac.uk/cgi-bin/webadmin?A0=STARLINK