[daip] Re: specifying a reference frequency in a FITS files for AIPS

Eric Greisen egreisen at nrao.edu
Wed Mar 8 18:03:38 EST 2006


The baselines are still awfully big.  The u,v,w as recorded should be
in seconds.  Thus a baseline in seconds is its length in meters
divided by the speed of light in m/sec.  We compute the baseline in
wavelengths by multiplying by the frequency in Hz.

The real and imaginary parts are pretty small ~ 1.e-7.

I assume that it is okay that the baseline is all 1-2 for source 1
with times changing by only a little.

Eric Greisen




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