TThis is the web home for SPICE data for JUICE. For information about the mission operations, go to the JUICE Science Operations web.


ESA, in collaboration with NAIF and the JUICE Instrument Teams, produces a whole set of SPICE kernels for JUICE (event kernels are not produced for ESA missions). Refer to the description of the JUICE repository for information about naming conventions and time coverage for each of the kernels.

The JUICE SPICE dataset consists of several SPICE kernels, organised as follows:

  • CK kernels. This kernels contain information about orientation of the space vehicle or any articulating structure on it.
  • FK kernels. Reference frame specifications. Definitions of, and specifications of, relationships between reference frames (coordinate systems). Among the frames kernels included, there are kernels that specify reference frames related to the earth and the spacecraft.
  • IK kernels. Kernels that hold intrument information, such as field of view or internal timing.
  • LSK kernel. This kernels hold a table with the leapseconds used to convert between ET and UTC.
  • PCK kernels. These kernels provide information about Solar System bodies orientation and shape, and possibly parameters for gravitational, atmospheric or rings models.
  • SCLK kernel. This kernel (spacecraft clock coefficients) allows for conversion between ET and spacecraft clock. If there are multiple LSK kernels in this dataset, the latest kernel supersedes he previous ones. More information on the SCLK kernel(s) in this dataset is provided in SCLKINFO.TXT.
  • SPK kernels. Kernels with information about ephemeris (position and velocity) of the spacecraft and solar system bodies. The dataset provides such information for the planets, the Sun, the Moon, the New Norcia tracking station, several DSN tracking stations, and the spacecraft. More information on the SPK kernels in this dataset is provided in SPKINFO.TXT.


The JUICE SPICE repository contains pre-operational kernels in development for JUICE, organised by kernel type.

The latest meta-kernel each study trajectory of JUICE are the following:

Dataset Meta-kernel
CReMA 3.2 - Consolidated Study Trajectory 141a Metakernel
CReMA 3.1 - SGS GCO500 and Europa Fly-bys studies Metakernel
CReMA 3.1 - Consolidated Study Trajectory c141 n45 Metakernel
CReMA 3.0 - Consolidated Study Trajectory 141a Metakernel
CReMA 2.0 - Study Trajectory 140 Metakernel


The Release notes of the latest version of the JUICE kernel collection can be seen here



NAIF generates kernels that are mission independent. Some of them are used by ESA missions:

  • Binary and text PCK and LSK kernels.
  • Some SPK kernels with ephemeris of the solar system bodies.
  • SPK kernels for ground stations.
  • Frames kernels for ground stations.


The ESA SPICE Team collaborates with ODC Space and the Instrument Teams to create instrument and frames kernels for JUICE:

  • Preliminary SPK kernels with trajectory of JUICE created by Mission Analysis.
  • Preliminary CK kernels with orientation of JUICE created by ESA SPICE Service.
  • RSSD frames kernel.
  • The instrument kernels (IK) have been developed by ESA SPICE Service and the Instrument Teams.
  • The JUICE frames kernel has been created by the ESA SPICE Service.


The WebGeoCalc tool (WGC) provides a web-based graphical user interface to many of the observation geometry computations available from the SPICE system. A WGC user can perform SPICE computations without the need to write a program; the user need have only a computer with a standard web browse. 

Access to the WebGeoCalc here.

For more information on WeGeoCalc go to the NAIF WebGeoCalc description.


If you want to receive updates and notifications for SPICE for JUICE you might join the SPICE_JUICE mailing list here.

You can also join the #SPICE channel in the OpenPlanetary Group in Slack. You can access using this link. And you can register for the Group here.