Multi-star calibration in starphotometry

Abstract. We explored the improvement in starphotometry accuracy using a multi-star Langley calibration in lieu of the more traditional one-star Langley approach. Our goal was a 0.01 calibration-constant repeatability accuracy, at an operational sea-level facility such as our Arctic site at Eureka. Multi-star calibration errors were systematically smaller than single star errors and, in mid-spectrum, approached the 0.01 target for an observing period of 2.5 h. Filtering out coarse mode (super µm) contributions appears mandatory for improvements. Spectral vignetting, likely linked to significant UV/blue spectrum errors at large airmass, may be due to limiting field-of-view and/or sub-optimal telescope collimation. Starphotometer measurements acquired by instruments that have been designed to overcome such effects may improve future star magnitude catalogues and consequently starphotometry accuracy.