[AstroPy] satellite-centered ephemeris

Miguel de Val-Borro miguel.deval@gmail....
Thu Jan 12 09:44:53 CST 2012

Hi Jonathan,

I have looked at the SPICE tutorials on the ephemeris subsystem and it
looks that it does what I want. However I need the SPK kernel for the
Herschel satellite that I could not find in the NAIF server or at the
ESA SPICE webpage. Do you know if this kernel is publicly available


On Tue, Jan 10, 2012 at 09:37:17AM -0700, Jonathan T. Niehof wrote:
> On 01/10/2012 08:41 AM, Miguel de Val-Borro wrote:
> > Hello,
> >
> > I would like to calculate RA and Dec of solar system objects at the
> > position of the Herschel satellite. This can be done in the on-line JPL
> > Horizons system setting the observer to @herschel, however I would like
> > to calculate the coordinates from the orbital elements of Herschel and
> > the object at different times. I have checked that pyEphem Observer
> > object supports positions on Earth's surface; is there any available
> > package where I can use the orbital elements of a satellite to define
> > the observer frame?
> Miguel--
> Are you familiar with JPL's NAIF/SPICE library? It's C-based and would 
> probably have something that would work for this. We've been (slowly) 
> wrapping it in Python here, but don't have distribution permission yet. 
> I can probably knock loose "share with collaborators" permission if you 
> find a function in there that seems useful.
> -- 
> Jonathan Niehof
> ISR-3 Space Data Systems
> Los Alamos National Laboratory
> MS-D466
> Los Alamos, NM 87545
> Phone: 505-667-9595
> email: jniehof@lanl.gov
> Correspondence /
> Technical data or Software Publicly Available

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