[Difx-users] FITS Card format? {External}

[Walter Brisken]

This violation of the standards was inherited from the old VLBA hardware 
correlator days.  I would consider this an erratum of the correlator 
output format but would hope that a FITS reader would make reasonable 
assumptions when encountering this sort of issue.

-W

-------------------------
Walter Brisken
NRAO
Deputy Assistant Director for VLBA Development
(505)-234-5912 (cell)
(575)-835-7133 (office; not useful during COVID times)

On Fri, 3 Dec 2021, Mark Kettenis via Difx-users wrote:

>> Date: Fri, 3 Dec 2021 09:48:49 +0100
>> From: Eskil Varenius via Difx-users <difx-users at listmgr.nrao.edu>
>>
>> Hello,
>>
>> I used DiFX 2.5.4 to correlate some data, then difx2fits (bundled with
>> 2.5.4 release) to generate fits-IDI. When using CASA importfitsidi to
>> read this into Measurement Set format, I get the interesting log message
>>
>> 2021-12-03 08:44:56    WARN        FITS card 46: EQUINOX = 'J2000   ' /
>> 2021-12-03 08:44:56    WARN        Keyword value has wrong data type.
>>
>> I assume either difx2fits or CASA is wrong here. Do we know if difx2fits
>> is correct, and if not: can this be fixed to avoid the message? Seems
>> benign, but warnings are annoying...
>
> Hi Eskil,
>
> CASA is correct here; see section 8.3 of the FITS standard (version 3.0).
>
> Cheers,
>
> Mark
>
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