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Questions tagged [spice]

The SPICE is a information system released by the Navigation and Ancillary Information Facility (NAIF) to assist scientists and engineers. The system includes data sets called "kernels" and the SPICE Toolkit, a software library needed to read the kernel files and to calculate observation geometry parameters of interest to scientists and engineers.

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6 votes
4 answers
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Access to Chebyshev coefficients from JPL ephemerides

I want to generate an ephemeris file containing the Chebyshev coefficients, similar to how we can generate ephemeris file of positions with Horizon tool (https://ssd.jpl.nasa.gov/horizons/app.html#/). ...
GuillaumeJ's user avatar
4 votes
2 answers
713 views

How to obtain Chebyshev coefficients directly from the JPL Horizon's interface?

I'm from Spain and I'm currently finishing my degree in Aerospace Engineering. I am starting with all of this. My objective is to obtain the Chebyshev coefficients for the major planets position, ...
Diego Suárez González's user avatar
2 votes
1 answer
158 views

How to retrieve MSL EDL trajectory using Javascript and webgeocalc API?

I found a "javascript gateway" to NASA SPICE data, the "webgeocalc" web api: https://wgc2.jpl.nasa.gov:8443/webgeocalc/example/perform-calculation.html It works both online and ...
jumpjack's user avatar
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1 vote
1 answer
263 views

Was the famous SPICE package of programs, utilities and data kernels named after "Melange" found on the planet Arrakis?

This question is NOT about a fictional planet: This question is about NASA JPL history and the naming of SPICE. It is not primarily about the fictional planet Arrakis nor the fictional drug Melange ...
uhoh's user avatar
  • 149k
3 votes
1 answer
488 views

SPICE defining a topocentric frame on the Moon

I would like to define a topocentric frame for a particular spot on the moon. From the frames required reading i have this: ...
atapaka's user avatar
  • 193
3 votes
1 answer
286 views

Horizons ephemeris - how did they calculate that “Keplerian GM” value?

I’ve been playing with the NAIF’s SPICE library for some time (CSPICE in particular). In order to obtain the state vector of an asteroid from its osculating elements, I’m calling the “conics_c” ...
Georgi Vidinski's user avatar