Hey! New Horizons is so far away that Proxima Cen shifts by 32 arcsec and Wolf 359 by 16, and we're going to show that by taking images of their fields on April 22-23 and comparing them to simultaneous Earth-based images. http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20200129 …
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We’ve been able to do 1%, but the pixels are 4”. We still can’t get anywhere near Gaia.
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I can usually get about 150 mas absolute astrometry on bright targets. The PSF isn't time constant because of the thruster firings, but b is pretty consistent across the field.
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