[daip] combining epoch 1950 and 2000 data

[Leonia Kogan]

Tyler,

>Should I run EPOSW on the B1950 file before running
>UVFIX?

I do not think so.
The key statement is that you need to use UVFIX any way to have your UV 
calculated at the same coordinate system.

What AIPS version do you have? Probably it is very ancient.

If you have a problem to get the last version of AIPS, then 
Eric Greisen can offer you another way recalculating UV: EPOSW=>UVSRT.
UVFIX would be better.

Leonia

PS. Please address your next messages to daip at nrao.edu as well



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>From nordgren at lowell.edu Fri May 25 14:23 MDT 2001
Date: Fri, 25 May 2001 13:23:23 -0700 (MST)
From: "T. Nordgren" <nordgren at lowell.edu>
To: lkogan at zia.aoc.NRAO.EDU
Subject: Re: [daip] combining epoch 1950 and 2000 data
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Status: RO

Dear Leonia,
	My version of UVFIX does not seem to do
what yours does (at least as far as I can tell
from looking at input and output file headers).
I have taken the UV single-source file
with epoch B1950 and run UVFIX as
you described. SHIFT = 0 0 and UVFIXPRM = 0. The
input file header says:

"AIPS 1: Coordinate equinox 1950.00"

After running UVFIX, the output uv single-source
file has exactly the same header as the input one.
The coordinates are exactly the same as is the equinox.
It still says:

"AIPS 1: Coordinate equinox 1950.00".

Nothing has changed as far as the header is concerned.
Should I run EPOSW on the B1950 file before running
UVFIX?

Thanks,

Tyler


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