Abstract
The Juno mission’s primary science objectives include the investigation of Jupiter interior structure via the determination of its gravitational field. Juno will provide more accurate determination of Jupiter’s gravity harmonics that will provide new constraints on interior structure models. Juno will also measure the gravitational response from tides raised on Jupiter by Galilean satellites. This is accomplished by utilizing Gravity Science instrumentation to support measurements of the Doppler shift of the Juno radio signal by NASA’s Deep Space Network at two radio frequencies. The Doppler data measure the changes in the spacecraft velocity in the direction to Earth caused by the Jupiter gravity field. Doppler measurements at X-band (\(\sim 8\) GHz) are supported by the spacecraft telecommunications subsystem for command and telemetry and are used for spacecraft navigation as well as Gravity Science. The spacecraft also includes a Ka-band (\(\sim 32\) GHz) translator and amplifier specifically for the Gravity Science investigation contributed by the Italian Space Agency. The use of two radio frequencies allows for improved accuracy by removal of noise due to charged particles along the radio signal path.
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Acknowledgements
The authors thank the following colleagues for their notable contributions to the design, development, and testing of the various elements that constitute the Juno Gravity Science instrumentation. We especially appreciate the work at NASA’s Jet Propulsion Laboratory of Michael Agnew, Kris Angkasa, Scott Bryant, Fouad Chiha, Manuel Franco, Gary Glass, David Hansen, Steve Keihm, Juan Ocampo, Aluizio Prata, Joseph Vacchione, and Phil Yates. We thank the Italian Space Agency and Thales Alenia Space-Italy, especially Dario Andreozzi and the entire Ka-band Translator team. We appreciate the extraordinary support of the management and staff of the Deep Space Network. This work was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology under contract the National Aeronautics and Space Administration (NASA).
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Asmar, S.W., Bolton, S.J., Buccino, D.R. et al. The Juno Gravity Science Instrument. Space Sci Rev 213, 205–218 (2017). https://doi.org/10.1007/s11214-017-0428-7
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DOI: https://doi.org/10.1007/s11214-017-0428-7