[vsnet-chat 1086] (fwd) Re: helio(bary)centeric correction (Thorstensen)

[Taichi Kato <tkato>]

Date: Sun, 26 Jul 1998 13:19:44 -0400
From: "John R. Thorstensen" <thorsten@dartmouth.edu>
Message-ID: <10001086@hoge.baba.hajime.jp>
To: tkato@kusastro.kyoto-u.ac.jp
Subject: DE200 ...
Content-Type: text
Content-Length: 893


Dear Dr. Kato,

You wrote:

>    XYZ coordinates for the earth and the barycenter are given for some epochs
close to the DE200 initial epoch (I will later make numerical integrations
for more recent epochs on a faster machine).  

... for my own purposes I actually fetched the DE200 from the JPL
web site (I only fetched 1980-2000 and 2000-2020), together with their
fortran software for reading the databases.  I had to work a little to 
run the programs which put the text data back into binary files, 
but once I got everything working it's pretty simple to run routines
which query the database.  So there's no need to numerically integrate
anything ... the JPL software delivers the XYZ coordinates of any
of the major planets, the moon, and the barycenter given only the
TDT.

   The 40-year DE200 binary file is a total of only 3 Mbyte in binary
form.
				Best,
					John Thorstensen

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