Besides the official source for SPK files (ftp://ssd.jpl.nasa.gov/pub/eph ...) is there a place where people upload kernels for the smaller bodies in the solar system? I was looking for the Jupiter Trojans and other Trojans.


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    $\begingroup$ You might find some information here slightly interesting, although it's not what you are asking for space.stackexchange.com/a/19263/12102 especially the "required reading" page naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/req/spk.html $\endgroup$
    – uhoh
    Commented Jul 11, 2018 at 3:31
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    $\begingroup$ Also, according to this page, Comets & Asteroids: Ephemerides for comets and asteroids are available from JPL's HORIZONS system. SPK ephemeris files can also be custom generated using HORIZONS for use with JPL's NAIF SPICE toolkit. $\endgroup$
    – uhoh
    Commented Jul 11, 2018 at 3:37
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    $\begingroup$ Doesn't the DE438s have a bunch of them? The GM parameter for them is in the comments at the start (names start with MA), but I do not know if the Chebyshev coefficients are also present for these items. $\endgroup$
    – ChrisR
    Commented Jul 11, 2018 at 4:22
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    $\begingroup$ naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/asteroids and ssd.jpl.nasa.gov/x/spk.html may or may not be helpful $\endgroup$
    – user7073
    Commented Jul 11, 2018 at 13:48
  • $\begingroup$ Ok, reporting back on all the helpful answers here: ssd.jpl.nasa.gov/x/spk.html is great, gives SPK files, but a) only one body at a time b) the time range per file is heavily restricted - possibly for file size c) hard to find what range of data is available for a body d) documentation issues e) which is probably why its not so findable (like no inbound links). The telnet interface to Horizons is possibly the ticket. I have to learn that and will report back. $\endgroup$ Commented Jul 27, 2018 at 0:36


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