Concerning SH₀ES data: discrepant W_{0, VI} absolute magnitudes for Cepheids in the keystone galaxy NGC4258

Abstract

SH₀ES VI-band photometry for classical Cepheids in the keystone galaxy NGC4258 yield discrepant absolute magnitudes. Specifically, the 2016 and 2022 published SH₀ES Cepheid data for NGC4258 exhibit a substantial offset of ΔW_{0, VI} ≃ 0^m.3. That adds to a suite of existing concerns associated with the SH₀ES analysis, which in sum imply that their relatively non-changing Hubble constant for nearly 20 years warrants scrutiny.