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>> I generally don't consider 2arcsec as a "small systematic difference". >> ...high airmass...a more likely problem is differential refraction... What would be the expected amount of differential refraction at the Berto's airmass? This problem could be avoided using reference stars with similar colors to the object. The "hidden" problem of the software could be a more significant cause, though... We (naturally including Yamaoka-san) would be happy to receive FITS files (as usual) from Berto to make further astrometric analysis. The image would be also useful for web presentation for helping other observers' identification. In any case, a 2-arcsec accuracy of astrometry is hardly sufficient to confirm the identification in the LMC field! Regards, Taichi Kato
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