Under a Gaussian PSF simulation with AST-INPE parameters, Gaussian shape fitting (ALG-6) gives the lowest centroiding error but costs about 36x more compute than simple center-of-gravity variants, while thresholding biases dim-star brightness estimates.
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Evaluation of centroiding algorithms for an autonomous star tracker
Under a Gaussian PSF simulation with AST-INPE parameters, Gaussian shape fitting (ALG-6) gives the lowest centroiding error but costs about 36x more compute than simple center-of-gravity variants, while thresholding biases dim-star brightness estimates.