Hi Bill,
This occasionally happens with Astrometrica, often occurring when an image is included in a stack by mistake with e.g. a bright artificial satellite crossing the field, throwing the software off.
Astrometrica doesn't directly warn when these happen, but normally they are very obvious to see in the final stacked image and the effect can also be seen in the Astrometrica log file which gives the X and Y pixel amounts that each image has been offset by.
I think in all the cases I've hit these are simple shifts (no rotation), same as in the M15 stack.
Peter
J95
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On 29/12/2024 19:28, Bill J. Gray wrote:
On 12/29/24 10:39, Peter Birtwhistle via groups.io wrote:> I think the stacking may have registered a frame incorrectly causing a
faint image of the centre of M15 to appear offset to the west.
?? Interesting.? I wonder how often such things happen?? Often enough that stacking software should attempt to detect them and warn you about it?
-- Bill
