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Scandariato, Gy. M. Szab\\'o, H. Rauer, I. Pagano, I. Ribas, J. A. Patel, J. Cabrera, J. Farinato, J. Laskar, K. G. Isaak, K. Heng, L. Delrez, L. Fossati, L. Kiss, M. B. Davies, M. Beck, M. Deleuil, M. Fridlund, M. Gillon, M. G\\\"udel, M. Lendl, M. Steller, N. Billot, N.C. Santos, N. Rando, N. Thomas, N. Walton, O. Demangeon, P. F. L. Maxted, P. Guterman, R. Alonso, R. Ottensamer, R. Ragazzoni, S. C. C. Barros, S. Charnoz, S. G. Sousa, S. Hoyer, S. Udry, Sz. Csizmadia, T. B\\'arczy, T. Beck, V. Nascimbeni, V. Singh, V. Van Grootel, W. Baumjohann, W. Benz, X. Bonfils, Y. Alibert","submitted_at":"2022-02-23T13:53:11Z","abstract_excerpt":"We report the detection of the secondary eclipse of the hot Jupiter HD 209458b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4 +/- 3.3 ppm translates into a geometric albedo of A_g = 0.096 +/- 0.016. 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