[AstroPy] Solar System ephemerides in astropy.coordinates

[Andrew Williams]

Hi Matt, I'd give skyfield (https://rhodesmill.org/skyfield/) a try - 
it's a complete rewrite of pyephem by the original package maintainer. 
It's very fast, uses the JPL ephemeris as well as parsing satellite 
TLEs, and plays nicely with astropy objects (converting times and 
coordinates to and from astropy Time and SkyCoord objects).

Andrew

On 2019-09-10 9:41 PM, Juan Luis Cano wrote:
> Hello Matt,
> 
> The SPK segments are hardcoded (see links and comments in 
> https://github.com/astropy/astropy/issues/6472) so, unless I'm mistaken, 
> I don't think this is something that can be easily done in Astropy. I 
> would be interested to see this happening though.
> 
> As an alternative, you might be interested in checking SpiceyPy 
> https://github.com/AndrewAnnex/SpiceyPy/ (installable with pip and 
> conda-forge) and try to combine it with astropy.coordinates.
> 
> Regards,
> 
> On Tue, Sep 10, 2019 at 3:28 PM Matthew Burger <mburger at stsci.edu 
> <mailto:mburger at stsci.edu>> wrote:
> 
>     I’m trying to use astropy.coordinates.solar_system_ephemeris to
>     calculate the RA and Dec of other bodies besides planets. Is this
>     possible? I know which JPL SPICE kernels I want to use, but I can’t
>     load them. If I specify another kernel with a url (e.g.,
>     https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/satellites/jup310.bsp),
>     it downloads the file but can’t use it.____
> 
>     __ __
> 
>     I’m using astropy 3.2.1 with python 3.7.4.____
> 
>     __ __
> 
>     Thanks,____
> 
>     Matt____
> 
>     __ __
> 
>     *************************************************************____
> 
>     Matthew Burger____
> 
>     Archive Scientist____
> 
>     Data Processing & Archive Services (DPAS), Deputy Branch Manager____
> 
>     Space Telescope Science Institute____
> 
>     mburger at stsci.edu <mailto:mburger at stsci.edu>____
> 
>     410/338-6810____
> 
>     *************************************************************____
> 
>     __ __
> 
>     __ __
> 
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> 
> 
> -- 
> Juan Luis Cano
> 
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