ellipse

Sergio Cellone wrote on Jan 15, 1998

Hi.

 I have found very useful the new version of the "isophote" package
 (STSDAS Version 2.0); however, I want to point out a minor problem:

 When using the "ellipse" task with fixed elliptical parameters (i.e.,
 "hcenter=yes hellip=yes hpa=yes) I have noticed that, if the parameter
 "geompar.recenter" is set to "yes", the initial X0 and Y0 do not
 remain fixed at their initial values; instead the ellipses are
 "recentered".

 The main problem is that the new X0 and Y0 are integer, so they can be
 nearly 1 pix displaced from the desired values. For example, I have
 run "ellipse" with: x0=193.43 y0=252.91 ellip0=0.2257 pa0=71.15
 recent=yes hcent=yes hellip=yes hpa=yes, and I obtained X0=194 Y0=252
 ELLIP=0.2257 and PA=71.15 for every SMA.

 Everything works as wanted with "recenter=no", however, this is not
 evident from the help pages. I think that this should be explicitly
 said in the "controlpar" help pages.

 Thank you very much.
 Best regards.


  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 | Dr. Sergio A. Cellone             Complejo Astronomico El Leoncito      |
 | scellone@castec.edu.ar            C.C. 467 - 5400 San Juan - Argentina  |
 |                                   Tel.: 54-64-213653  Fax: 54-64-213693 |
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Last post on Jan 15, 1998