[AstroPy] A Mystery: DAOStarFinder Not Finding an Obvious Star in Just One Image

[Peter Dzwig]

Is this issue something that could/should be mentioned in the manual(s)?

Peter Dzwig

On 28/02/2022 17:27, Robert Carr wrote:
> Thank you to Eric and Larry for their helpful tips. The Obvious Star is 
> obviously about perfectly round and so I was not surprised that 
> revising roundlo and roundhi did not uncloak my object.  The 
> pixel-by-pixel inspection suggested by Eric, however, revealed that the 
> pixel values were rather constant across much of the object and then 
> dropped off sharply toward the edges.  This was distinctly 
> non-Gaussian.  I had naively assumed that the default values of 
> DAOStarFinder were the least restrictive ones but a little education can 
> be a marvelous thing.  Revising the sharpness parameters sharplo and 
> sharphi caused DAOStarFinder to "discover" a great number of additional 
> objects in the image, some of them real and one of them my Obvious Star!
> 
> Thank you so much for your help!
> 
> Bob Carr
> 
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-- 

Dr. Peter Dzwig