[Spice_announce] Announcement of updated generic PCKs based on the 2015 IAU WGCCRE report

[Boris Semenov]

NAIF is pleased to announce the release of updated generic PCKs based on 
the 2015 report of the IAU Working Group on Cartographic Coordinates and 
Rotational Elements (WGCCRE).

Due to extension of the Mars system rotation model in the 2015 Report 
that could not be accommodated by earlier SPICE Toolkits, this update 
consists of two files:

-- pck00011.tpc, compatible with Toolkit version N0067 or later

    http://naif.jpl.nasa.gov/pub/naif/generic_kernels/pck/pck00011.tpc

    Data in this file, other than orientation data for the Mars
    system, are usable by older Toolkits.

-- pck00011_n0066.tpc, compatible with Toolkit version N0066 or earlier

    http://naif.jpl.nasa.gov/pub/naif/generic_kernels/pck/pck00011_n0066.tpc

    Phobos orientation data in this file have been modified, and
    slightly degraded, to make them usable by older Toolkit versions.

NAIF recommends caution and careful consideration in adopting these new 
PCKs, especially for on-going flight projects and well established 
analysis activities, as some rotation models in this PCK (e.g. Mercury, 
Mars, Neptune, etc.) differ significantly from those provided in the 
previous generic PCK (pck00010.tpc)

For complete details about these new PCK files please refer to their 
internal comments.

Happy Holidays!