SYSTEM: V2.9
NUMBER: 126 MODULE: apphot package SYSTEM: V2.9 DATE: Wed Jun 27 16:47:34 MST 1990 FROM: davis BUG: Due to fractional pixel effects the sky fitting routines in apphot can fail to preallocate enough space to hold the sky pixels, resulting in a memory corruption error or a segmentation violation on exit from a task. This condition occurs rarely most often when the sky fitting annulus is very narrow. All the apphot tasks which do sky fitting are affected. STATUS: The bug is fixed in 2.10. There is no workaround although increasing the width of the sky fitting annulus slightly may bypass the problem. Contact the IRAF group for a fix. NUMBER: 226 MODULE: artdata.mkobjects SYSTEM: V2.9-V2.10.2 DATE: Fri Sep 17 14:13:24 MST 1993 FROM: valdes BUG: The scales of the 'expdisk' and 'devauc' images are incorrect due to an integer truncation error. The error is such that the actual output radius for a given input radius is given by the formulas: expdisk: rout = rin * int(ln(D)/1.6783) / ln(D)/1.6783 devauc: rout = rin * int(ln(D)/7.67)**4) / (ln(D)/7.67)**4 where D is the dynamic range parameter in the ARTDATA package parameters, ln() is the natural logarithm, int() is the integer truncation function, and ** is the exponentiation operator. From this one can, fudge the input radii to give the desired output radii, select a dynamic range where the correction factor is 1, or account for this as needed when the artificial image is analyzed. The simplest thing is to adjust the dynamic range; for example, a dynamic range of 126514 for the 'expdisk' model is the closest to the default value of 10000 which will give correct output scales. STATUS: Fixed in V2.10.3