Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.
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When the Shadow Meets Its Measure: Assessing the Feasibility of Submillimeter Black Hole Shadow Imaging in Megamaser Disk AGN
Of 21 megamaser-disk AGN, only NGC 4258 is resolvable on Earth-L2 baselines, and its spin-offset measurement is limited by 22 GHz maser astrometry, not by shadow centroid precision.