[AstroPy] Heliocentric Velocity Correction

David Berry d.berry@jach.hawaii....
Tue Mar 13 15:16:07 CDT 2012


Pyast (http://dsberry.github.com/starlink/pyast.html) provides a wide
range of facilities for handling spectral, celestial and time axes.
This includes heliocentric velocity correction (amongst other things)
for spectral axes. In particularly, see the "SpecFrame" class
(http://www.starlink.ac.uk/docs/sun211.htx/node680.html#SpecFrame). If
you create two SpecFrames with different properties (i.e. different
standards of rest, units, geocentic observatory positions, etc), then
the astConvert method
(http://www.starlink.ac.uk/docs/sun211.htx/node245.html#xref_astConvert)
can be used to get the transformation between them.

David


On 13 March 2012 19:58, Scott Ransom <sransom@nrao.edu> wrote:
> Hi Vivienne,
>
> There are heliocentric velocity routines which have many of the major
> observatories in pyslalib (which wraps the GPL'd version of SLALIB).
> See the sla_earth routine for a description (and for a way of getting
> even more accurate values).
>
> https://github.com/scottransom/pyslalib
>
> Scott
>
> PS:  There is a _lot_ of other high-quality functionality in SLALIB
> (which is all wrapped by pyslalib) as well...
>
> On 03/13/2012 03:24 PM, Vivienne Baldassare wrote:
>> Is there a python function for calculating the heliocentric velocity
>> correction?  I found one called helcorr.py in the Astrolibpy library but
>> am curious if there is another one worth considering.  In particular, I
>> noticed that the major observatories aren't in by default.  If this is
>> the only one, is it worth me improving this one?
>>
>> Best,
>> Vivienne Baldassare
>>
>>
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>
> --
> Scott M. Ransom            Address:  NRAO
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> email:  sransom@nrao.edu             Charlottesville, VA 22903 USA
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