Time-resolved visible/near-infrared spectrometric observations of the Galaxy 11 geostationary satellite

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• 作者：Donald Bé ; dard ; ¹ ; ^{donald.bedard@rmc.ca} ; Gregg A. Wade¹
• 关键词：Space Situational Awareness ; Space surveillance ; Spectrometric characterization ; Photometric characterization ; Geostationary satellites ; Galaxy 11
• 刊名：Advances in Space Research
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：59
• 期：1
• 页码：212-229
• 全文大小：2086 K
• 卷排序：59

文摘

Time-resolved spectrometric measurements of the Galaxy 11 geostationary satellite were collected on three consecutive nights in July 2014 with the 1.6-m telescope at the Observatoire du Mont-Mégantic in Québec, Canada. Approximately 300 low-resolution spectra (R≈700R≈700, where R=λ/ΔλR=λ/Δλ) of the satellite were collected each night, covering a spectral range between 425 and 850 nm. The two objectives of the experiment were to conduct material-type identification from the spectra and to study how the spectral energy distribution inferred from these measurements varied as the illumination and observation geometry changed on nightly timescales. We present results that indicate the presence of a highly reflective aluminized surface corresponding to the solar concentrator arrays of the Galaxy 11 spacecraft. Although other material types could not be identified using the spectra, the results showed that the spectral energy distribution of the reflected sunlight from the Galaxy 11 spacecraft varied significantly, in a systematic manner, over each night of observation. The variations were quantified using colour indices calculated from the time-resolved spectrometric measurements.