Evidence for an atmosphere on Io |
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| Affiliation: | 1. Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, 48109, USA;2. Division of Geological and Planetary Science, California Institute of Technology, Pasadena, CA, USA;3. Laboratory for Atmospheric and Space Physics, University of Colorado, CO, USA;4. LESIA, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France;5. Foundation “La main à la pâte”, Montrouge, France;1. Swedish Institute of Space Physics, Kiruna, Sweden;2. Pakistan Space & Upper Atmosphere Research Commission, Karachi, Pakistan;3. Department of Physics and Astronomy, University of Iowa, IA, USA;4. IRAP, CNRS, Toulouse, France;5. Space Research Institute, Graz, Austria;1. Department of Surgery, The University of Chicago, Chicago, Illinois;2. Comprehensive Cancer Center, The University of Chicago, Chicago, Illinois;3. Department of Medicine, The University of Chicago, Chicago, Illinois;4. Department of Public Health Sciences, The University of Chicago, Chicago, Illinois;5. Center for Research Informatics, The University of Chicago, Chicago, Illinois;1. Department of Earth & Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;2. Canadian Centre for Isotopic Microanalysis, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada;1. Polar Research Institute of China, Shanghai 200136, China;2. School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China;3. National Astronomical Observatories/Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing 210042, China;4. State Key Laboratory of Technologies of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;5. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China;6. Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China;7. National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China;8. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China;9. Purple Mountain Observatory, Chinese Academy of Science, Nanjing 210008, China |
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| Abstract: | Photometric observations of eclipse reappearances of Jupiter I and II were made in 1962–1964 to search for a possible anomalous brightening of the satellite after eclipse. A brightening, if present, would suggest a frost or snow deposit or a haze layer caused by a surface temperature drop during eclipse. In each of four cases of JI eclipse reappearances a brightness anomaly was indeed observed, having an average value of 0.09 stellar magnitudes. The anomaly decayed in about 15 min. A single observation of JII showed no anomaly. |
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