Enceladus plume density from Cassini spacecraft attitude control data
نویسندگان
چکیده
منابع مشابه
Cassini detection of Enceladus’ cold water-group plume ionosphere
[1] This study reports direct detection by the Cassini plasma spectrometer of freshly-produced water-group ions (O, OH, H2O , H3O ) and heavier water dimer ions (HxO2) + very close to Enceladus where the plasma begins to emerge from the plume. The data were obtained during two close (52 and 25 km) flybys of Enceladus in 2008 and are similar to ion data in cometary comas. The ions are observed i...
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During three low-altitude (99, 66, 66 km) flybys through the Enceladus plume in 2010 and 2011, Cassini's ion neutral mass spectrometer (INMS) made its first high spatial resolution measurements of the plume's gas density and distribution, detecting in situ the individual gas jets within the broad plume. Since those flybys, more detailed Imaging Science Subsystem (ISS) imaging observations of th...
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Compositional information obtained with Cassini instruments during Enceladus and Saturn’s E ring flybys is used to constrain chemical and phase (minerals, ices, clathrates, organics, liquids) composition of the moon’s interior. The Enceladus’ plume emits cometary-type (NH3, HCN, CH4) likely primordial gases together with aqueously formed species (Na salts, silica and H2). This could indicate aq...
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The Cassini spacecraft flew close to Saturn's small moon Enceladus three times in 2005. Cassini's UltraViolet Imaging Spectrograph observed stellar occultations on two flybys and confirmed the existence, composition, and regionally confined nature of a water vapor plume in the south polar region of Enceladus. This plume provides an adequate amount of water to resupply losses from Saturn's E rin...
متن کاملSpacecraft Attitude Tracking Control
The problem of reorienting a spacecraft in to acquire a moving target is investigated. The spacecraft is modeled as a rigid body with N axisymmetric wheels controlled by axial torques, and the kinematics are represented by Modified Rodriques Parameters. The trajectory, denoted the reference trajectory, is one generated by a virtual spacecraft that is identical to the actual spacecraft. The open...
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ژورنال
عنوان ژورنال: Icarus
سال: 2018
ISSN: 0019-1035
DOI: 10.1016/j.icarus.2017.09.003