[daip] (no subject)

[Eric Greisen]

Leonia Kogan writes:
 > Sasha,
 > 
 > >12 1418+546        : 0000         14:19:46.6000  54:47:21.540   82049 
 > >31 1418+546       A: 0000         14:19:46.5974  54:23:14.787    4793 

     The A is part of the name because the reading task refused to mix
two sources with different coordinates.  For a VLB source 24 arc
minutes in declination is an enormous difference and you should NEVER
consider mixing these two as equal.  After calibration and SPLIT you
could DBCON them and that will shift the phases - but this would not
work for VLBI type data.

Eric Greisen


 > 
 > These two source names are not identical. The letter A makes the difference 
 > and means CALCODE. This adverb is used in AIPS to make additional option 
 > to select calibrators at AIPS tasks
 > If you type <help calcode>, you'll see:
 > 
 > help calcode
 >  bonito    AIPS (31DEC04)   1876     05-FEB-2004  10:06:54    Page    1
 > Help on CALCODE in AIPS version 31DEC04
 > CALCODE
 > Type: Adverb  (String*4)
 > Use:  This string is used to specify a desired calibration
 >       source code.
 >       '    ' => any calibrator code selected
 >       '*   ' => any non blank code (calibrators only)
 >       '-CAL' => blank codes only (no calibrators)
 > 
 > You can see the list of the sources using tasks LISTR or PRTAB (inext='su')
 > 
 > So I do not recommend you "treat the two sources as one.
 > 
 > Instead you should use adverb CALCODE to make the selection.
 > 
 > Leonid Kogan
 > 
 > 
 > 
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 > 
 > Dear Sir/Madam, 
 >  
 > I am working with data correlated at Penticton correlator. 
 > It looks like several of the sources obesrved were correlated 
 > with different coordinates. For example 
 >  
 > 12 1418+546        : 0000         14:19:46.6000  54:47:21.540   82049 
 > 31 1418+546       A: 0000         14:19:46.5974  54:23:14.787    4793 
 >  
 > Is there a way to treat them as one source? 
 >  
 > Thank you, 
 >  
 > Sasha 
 >  
 >  
 >  
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