I have mentioned various kinds of configuration file formats used in Fortran here before. One that I haven’t mentioned is the text PCK file format used by the NAIF SPICE Toolkit. This is a format that is similar in some ways to

Tagged with: , ,

Time Conversions with SPICE

JPL’s SPICE Toolkit (SPICELIB) is the premier software library for computations related to solar system geometry. It is freely distributed, and is also one of the best-documented libraries I have ever come across. SPICELIB also includes a comprehensive set of

Tagged with: , ,

Another One Bites the Dust

JPL recently released an update to their awesome SPICE Toolkit (it is now at version N66). The major new feature in this release is the Digital Shape Kernel (DSK) capability to define the shapes of bodies (such as asteroids) via tessellated plate

Tagged with: , , , ,

IAU Rotation Models

The IAU Working Group on Cartographic Coordinates and Rotational Elements (WGCCRE) is the keeper of official models that describe the cartographic coordinates and rotational elements of planetary bodies (such as the Earth, satellites, minor planets, and comets).  Periodically, they release a report containing the coefficients

Tagged with: , , , ,

Speeding up SPICE

The SPICE Toolkit software is an excellent package of very well-written and well-documented routines for a variety of astrodynamics applications.  It is produced by NASA’s Navigation and Ancillary Information Facility (NAIF).  Versions are available for Fortran 77, C, IDL, and Matlab. To speed up

Tagged with: , ,

SPICE N65 Released

JPL just released a new version of the SPICE Toolkit (N65).  According to the What’s New page, changes include: support for some new environments and termination of some old environments new Geometry Finder (GF) interfaces — illumination angle search, phase angle search, user-defined

Tagged with: , ,