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

EnVision SPICE KERNELS SET

The ESA SPICE Service (ESS), in collaboration the EnVision SGS and the Instrument Teams, produces a SPICE Kernel Dataset (SKD) for the EnVision mission. A complete description including naming convention and an index of the contents of the EnVision SKD can be found in the description of the EnVision repository.

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

The SKD has the following directory structure:

• root directory (named after the mission: EnVision)
  • kernels
    • ck: Kernels that contain orientation for the spacecraft and some of its structures, (solar arrays, for instance).
    • fk: Kernels that define reference frames needed for the Mission.
    • ik: Kernels for the instruments on board the spacecraft.
    • lsk: Leapseconds kernel.
    • mk: Meta-kernel files (a.k.a "furnsh" files) that provide lists of kernels suitable for a given mission period in the appropiate order.
    • pck: Kernels that define planetary constants.
    • sclk: Spacecraft clock coefficients kernels.
    • spk: Orbit kernels, for the spacecraft and other solar system bodies.
    • dsk: Digital Shape kernels for extended bodies such as the EnVision spacecraft
  • misc
    • release notes: Includes the Release Notes of the SKD.
    • cosmo: The SPICE-enchanced configuration for the EnVision mission.
    • other: different directories of interest.

OBTAINING THE KERNELS

The complete EnVision SPICE Kernel Dataset can be obtained from the ESA SPICE Service HTTPs or the ESA SPICE Service FTP. 

In order to obtain the latest operational kernels we recommend you to download the kernels listed in the metakernel. EnVision has a different flavour of metakernels that are described below.

The latest version of the SKD's operational sub-set -including only the latest kernels listed on the metakernel- can be obtained either via:

• Direct Download (Zip file with the latest version of the EnVision SKD in Git)
• Browse the kernels individually
• BitBucket Git Repository

The latest metakernel each study trajectory of EnVision are the following:

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

ORIGIN OF THE KERNELS

GENERIC KERNELS PROVIDED BY NAIF

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.

KERNELS CREATED BY ESA SPICE SERVICE AND EnVision SGS

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

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

WEBGEOCALC

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.

STAYING TUNED

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

Notifications from the ESA SPICE Service can also be obtained via twitter.

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.