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Hi Pat,

I know that bug! 
In this case the image southernmost point is -1:22:40 and northernmost point is -1:18:08 so I don't this is the problem here.

The image is here if anyone would like to try and reproduce the problem.

ftp://ftp.star.bris.ac.uk/pub/rahm/HST_MOS_5136_ACS_WFC_F625W_drz.fits

It is 385Mb

regards,
Rhys

On 10 April 2015 at 15:34, <[log in to unmask]> wrote:
Rhys said:

> After upgrading from 2014A to 2015A, one of my users reports that
> the sextractor version that comes with gaia only searches half his
> image, see the image below.

This isn't the dreaded minus zero bug is it?  Something in the chain
is reading declination as a string #nn nn nn.n, decoding three
numbers and testing the first for sign.  But if nn=0, the sign gets
lost, and all the sources between 0 and -1 get folded into the
region between 0 and +1.


Patrick Wallace
____________________________________________________________________
RAL Space                                            +44-1235-531198
STFC Rutherford Appleton Laboratory
Harwell Oxford
Didcot, Oxfordshire, OX11 0QX, UK         [log in to unmask]
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Rhys Morris
Bristol Astrophysics Group and
Zone D, Astrophysics/Unix Support Specialist
Room 4.13, HH Wills Physics Lab
University of Bristol
Telephone: 0117 331 4239
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