I'm looking for a NAIF SPK file (these typically end in
.bsp) for a bunch of asteroids in the J2000 reference frame. I found
ftp://ssd.jpl.nasa.gov/pub/eph/small_bodies/asteroids_de430/ast343de430.bsp. They seem to be referenced to J2000 and they they have
10 (sun) as their center reference, but when I go to plot them they look wonky.
When I overlay their traces on
de430.bsp I get epicyclic looking traces for each individual body and the cloud of points seem to form the characteristic asteroid belt shape but offset by 2-3AU.
I'm using a basic SPK reader I've developed myself. The code is here (MIT licensed, as the question arose below). This reader is fine with the publicly released large body and satellite files (https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/planets/, https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/satellites/)
Has anyone used this file and did they have any issues with it? Thanks!