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The ANCH0R Survey - Additional Nearby Calibrators for H0 Reliability

The ANCH0R survey program is conducting a volume-limited survey to search every galaxy within 15 Mpc for 22 GHz water megamaser emission, with the goal of finding “the next NGC 4258.” NGC 4258 is the nearest, brightest, and “cleanest” disk megamaser system known, and its geometric distance carries disproportionate weight in setting the absolute scale […] Source
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greenbankobservatory.org broke the news on Thursday, June 25, 2026.
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