Abstract
Triggered by a call for observers in the BAV forum, I initiated CCD monitoring of the eclipsing variable BM Ori at the end of 2024. After optimizing the observing conditions in September 2025, the variable was monitored until beginning of November 2025 for 22 nights and (≈ 90 hours) in both the CV band and RGB. The observations were compared with simultaneous visual estimates [5][13]. The visual estimates are considerably lower (up to 3 magnitudes) than the measured values. This paper discusses the reasons for this discrepancy. During the monitoring no unusual dimming of light was found outside the known minima.
The weak image of the BM Ori on the historical photograph of the Trapezium by Henry Draper from 1880 [15][16] is explained and cannot be considered evidence of unusual light attenuation of the BM Ori.