[daip] FITS Antenna tables

[Leonia Kogan]

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>From djt at mrao.cam.ac.uk Thu Nov  9 09:30 MST 2000
Subject: Re: [daip] FITS Antenna tables
To: lkogan at zia.aoc.NRAO.EDU ([Leonia Kogan])
Date: Thu, 9 Nov 2000 16:29:36 +0000 (GMT)
Cc: djt at mrao.cam.ac.uk (David Titterington)
In-Reply-To: <200011091602.JAA24760 at bonito.aoc.nrao.edu> from "[Leonia Kogan]" at Nov 09, 2000 09:02:04 AM
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From: David Titterington <djt at mrao.cam.ac.uk>
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Status: RO

Dear Leonia,

Thanks for your quick response.  It sounds like I should choose one of
the following, and specify the Array to be VLA or VLBA, etc..?

Many thanks,
David.

-------------
> 
> Dear David,
> 
> There is no (unfortunately) the only coordinate system used for all arrays 
> in the AN table.
> 
> I give you the two examples.
> 
> VLBA:  uses the left handed coordinate system with X directed to the greenwich 
>        meridian.
> 
> VLA:   uses the right handed coordinate system with X directed to the meridian
>        of the array center. 
>        The array center coordinates are given the right handed coordinate 
>        system with X directed to the greenwich  meridian. 
>        The array center coordinates appear at the header of the antenna 
>        table as Array BX=-1601162.0   BY=  -5042003.0   BZ=   3554915.0
>       
> 
> AIPS reads the array name (Array=VLA, VLBA, ATCA...) from the antenna table and 
> selects the relevant coordinate system.
> 
> Regards
> 
> Leonia
> 
> 
> 
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> 
> >From owner-daip at kochab.cv.nrao.edu Thu Nov  9 08:38 MST 2000
> To: aipsmail at cv3.cv.nrao.edu
> Subject: [daip] FITS Antenna tables
> Cc: djt at mrao.cam.ac.uk
> From: David Titterington <djt at mrao.cam.ac.uk>
> Date: Thu, 09 Nov 2000 14:10:35 +0000
> Sender: owner-daip at kochab.cv.nrao.edu
> Precedence: bulk
> Content-Type: text
> Content-Length: 488
> X-Lines: 16
> Status: RO
> 
> Dear AIPS,
> 
> We are writing UV data from one of our instruments in FITS format for
> import to AIPS, and need to add the antenna tables as an extension to
> the FITS file, but I haven't so far been able to find a reference in
> the documentation which will tell me the coordinate system expected
> by AIPS for the antenna positions.
> 
> Could you point me in the right direction, please?
> 
> Many thanks,
> 
> David Titterington,
> Mullard Radio Astronomy Observatory,
> University of Cambridge,
> Cambridge, UK.
> 
> 
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