= A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk by J. R. Herrnstein and others
{c}
{tag=Work by J. R. Herrnstein}
{title2=1999}
https://arxiv.org/abs/astro-ph/9907013
Primary research, Nature 400, 539–541, DOI https://doi.org/10.1038/22972. The preprint title includes the 4% qualification. The observed water-maser <proper motions> and accelerations in <NGC 4258> supply an orbital distance anchor independent of stellar <standard candles>.
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