The photometric functions of Phobos and Deimos I. Disc-integrated photometry |
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| Authors: | M Noland J Veverka |
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| Institution: | Laboratory for Planetary Studies, Cornell University, Ithaca, New York 14853, USA |
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| Abstract: | We have used the integrated brightnesses from Mariner 9 high-resolution images to determine the large phase angle (20° to 80°) phase curves of Phobos and Deimos. The derived phase coefficients are β = 0.032 ± 0.001 mag/deg for Phobos and β = 0.030 ± 0.001 mag/deg for Deimos, while the corresponding phase integrals are qPhobos = 0.52 and qDeimos = 0.57. The predicted intrinsic phase coefficients of the surface material are βi = 0.019 mag/deg and βi = 0.017 mag/deg for Phobos and Deimos, respectively. The phase curves, phase coefficients and phase integrals are typical of objects whose surface layers are dark and intricate in texture, and are consistent with the presence of a regolith on both satellites. The relative reflectance of Deimos to Phobos is 1.15±0.10. The presence of several bright patches on Deimos could account for this slight difference in average reflectance. |
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