Simultaneous Collocated Photometry

Volume 43 number 2 (2015)

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Tom Calderwood

1184 NW Mt. Washington Drive, Bend, OR 97703; tjc@cantordust.net

Evan Getz

Oregon Episcopal School, Portland, OR 97223

Tom McBratney

Oregon Episcopal School, Portland, OR 97223

Eric Holcomb

Bend, OR 97701

Abstract

Two telescopes equipped with single channel photometers are operated side-by-side, observing the same stars, to evaluate the consistency of their results. In fifteen paired V band observations, we find that the median absolute difference between the two systems is 6 mmag, and that they always agree within 2σ errors.