Gaia DR3 astrometric properties of a comparison sample of 25 397 stars for HD 7977: ipd_gof_harmonic_amplitude versus ruwe. The sources have comparable scanning geometry and history (ecliptic latitude within 5 degrees) and similar brightness as HD 7977 (G-band magnitude within 1 magnitude). HD 7977 is indicated with a cross-hair. It falls clearly in the domain with poor astrometric fits (ruwe > 1.25) and extended source structure (elevated value of ipd_gof_harmonic_amplitude), compatible with duplicity.