[daip] aips_gripe

[Leonia Kogan]

Dear Lincoln,

I have checked again the CLCOR with SU table correction OPTYPE='ANTP'
and it works with my understanding of the task.

I can have the following guess why we have the different conclussion:

1. The correction given at CLCORPRM(5,6) are applied inside of the 
   CLCOR to the apparent coordinates (col14,15) but not to the epoch
   coordinates. The corrected epoch coordinates are calculated by 
   routine JPRECS using the corrected apparent coordinates at the input.

2. TABGET (probably does not give the right value for the coordinates
   as sum KEYVALUE(1)+KEYVALUE(2), because the value of KEYVALUE(1) 
   is printed using not enough digits.
   At least I can not understand it
   I used the task TBOUT to convert the aips SU table to the ASCII file.
   This file shows the coordinates with full accuracy.

Leonia
----- Begin Included Message -----

>From daip-admin at donar.cv.nrao.edu Thu Sep 20 16:31 MDT 2001
From: Lincoln Greenhill <lincoln at rglinux2.harvard.edu>
To: aipgripe at zia.aoc.NRAO.EDU, aipsmail at cv3.cv.nrao.edu, daip at cv3.cv.nrao.edu,
        egreisen at cv3.cv.nrao.edu, pmurphy at cv3.cv.nrao.edu
Subject: [daip] aips_gripe
Sender: daip-admin at donar.cv.nrao.edu
X-BeenThere: daip at listmgr.cv.nrao.edu
X-Mailman-Version: 2.0.5
Precedence: bulk
List-Help: <mailto:daip-request at listmgr.cv.nrao.edu?subject=help>
List-Post: <mailto:daip at listmgr.cv.nrao.edu>
List-Subscribe: <http://listmgr.cv.nrao.edu/mailman/listinfo/daip>,
	<mailto:daip-request at listmgr.cv.nrao.edu?subject=subscribe>
List-Id: This is the designated AIP list for AIPS support. <daip.listmgr.cv.nrao.edu>
List-Unsubscribe: <http://listmgr.cv.nrao.edu/mailman/listinfo/daip>,
	<mailto:daip-request at listmgr.cv.nrao.edu?subject=unsubscribe>
List-Archive: <http://listmgr.cv.nrao.edu/pipermail/daip/>
Date: Thu, 20 Sep 2001 18:24:45 -0400
Content-Type: text
Content-Length: 1250
X-Lines: 33
Status: RO

{20-SEP-2001 17:33:52}
{rglinux2     rglinux2}
{   24  31DEC01  LINX}
{lincoln greenhill}
{cfa}
{617 495 7194}
{I believe that CLCOR corrections to the SU table for opcode ANTP are
 not correctly implemented.
  
 Example:  Original coordinates:  05 35 14.5098  -5 22 30.482
           CLCORPRM    0  0  0  0  +0.0231  +0.017
           New SU table entry:    05 35 14.4953  -5 22 30.426
  
 I admit that there is something here I do not understand...I have
 used TABGET to read the real*8 entries in the SU table (cols. 11 & 12)
 and I do not obtain the coordinates listed by LISTR in hhmmss or dddmmss
 format.
  
 However, I am sure that the CLCORPRM entries do not add up to the values
 placed in the SU table.  I note that the CLCORPRM entries I have specified
 are angular offsets on the sky, in arcsec.  The expected new coordinates
 should be   05 35 24.14.5110  -5 22 30.4650  where I have accounted for
 precession and nutation in the J2000 frame.  At minimum, the sign of the
 change in RA is wrong.
  
  }
{CLCOR corrections to SU tbl for ANTP seem to be incorrect.}
{greenhill at cfa.harvard.edu}
{ }
_______________________________________________
Daip mailing list
Daip at listmgr.cv.nrao.edu
http://listmgr.cv.nrao.edu/mailman/listinfo/daip


----- End Included Message -----