JPL Development Ephemeris DE440 (SPICE kernel)

Data source (official):
- NAIF generic kernels repository:
  https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/planets/
  File: de440.bsp (and/or de440s.bsp)

Background / documentation:
- JPL SSD DE440/DE441 documentation:
  https://ssd.jpl.nasa.gov/doc/de440_de441.html

Attribution guidance:
- Please credit NASA/JPL/NAIF and (where appropriate) the DE440 publication.

Redistribution note:
- Per NAIF rules, redistribution of NAIF-distributed SPICE kernels is permitted as long as the kernels are not modified.
  See: https://naif.jpl.nasa.gov/naif/rules.html