Limit on the Photon Mass Deduced from Pioneer-10 Observations of Jupiter's Magnetic Field

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Abstract
We report an analysis of the Pioneer-10 data on Jupiter's magnetic field, in which the mass μ of the photon was treated as a free parameter. We set a limit of μ<~2×10−11 cm−1≡6×10−16 eV≡8×10−49 g. This is the smallest limit so far obtained from direct measurements. We compare our result with other published limits.