We present the results of multi band optical photometry (B, V, R and I) for 66% of the sample of geosynchronous satellites observable from Flagstaff, AZ. Observations were done while the targets were at solar phase angle smaller than ±5°, to probe the period when they are expected to reach maximum brightness. We discuss the distribution of magnitudes and colors of the sample, how these properties correlate with satellite age, and the how the color information can be used to differentiate between satellite buses.
Henrique R. Schmitt, "Multi-band optical photometry of geosynchronous satellites," Proc. SPIE 10641, Sensors and Systems for Space Applications XI, 1064104 (Presented at SPIE Defense + Security: April 16, 2018; Published: 2 May 2018); https://doi.org/10.1117/12.2305276.
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