[AstroPy] Heliocentric Velocity Correction

[gonghang.naoc]

Hi,according to the link below,the 3d velocity we get from astrolib has
nothing to do with the observatory position.My question is  the 3d velocity
is just the velocity of earth center?As the author claimed the precision
level is cm/s, is it necessary to  input the  longtitude, latitude and
elevation of the observatory?

Thank you!

http://www.astro.ucla.edu/~ianc/python/astrolib.htmlIDL> baryvel, jd, 2000,
vh, vb, /jpl ;JPL ephemeris==> vh = [-17.07236, -22.81126, -9.889419]
;Heliocentric km/s ==> vb = [-17.08083, -22.80484, -9.886409] ;Barycentric
km/s




On Sat, Jun 9, 2012 at 4:20 PM, gonghang.naoc <ghang.naoc at gmail.com> wrote:

> I have checked
> http://code.google.com/p/astrolibpy/source/browse/#git%2Fastrolib  and
> http://www.astro.ucla.edu/~ianc/python/astrolib.html
> Is there a whole astrolib module I can download and install? Or is there
> any other python module that can makes heliocentric velocity correction you
> suggest?
> Thank you very much!
>
>
> On Sat, Jun 9, 2012 at 10:52 AM, gonghang.naoc <ghang.naoc at gmail.com>wrote:
>
>> Dear pythoners:
>>           Is there any python nodule that can make heliocentric velocity
>> correction well?
>>           Thank you!
>>
>
>
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