[vsnet-chat 1080] Re: helio(bary)centeric correction (Thorstensen)

[Taichi Kato <tkato>]

Re: helio(bary)centeric correction (Thorstensen)

Dear Dr. Thorstensen,

   Since I haven't had a conventional analytical formula for obtaining the
barycenter, I have written some code in order to adapt a free software using
DE200 (NIPE, written by a Japanese amateur Novas) to my purpose.

   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).  I hope Dr. Thorstensen can
directly compare these results with his computation.  Note JDs are given
(in natural framework of DE200) in TDT.  Comparison with my old Newcomb-based
program has yielded differences to an order of a few 10^-7 AU for the
coordinate of the earth.

    JD(TDT)          X2000.0       Y2000.0       Z2000.0
----------------------------------------------------------------
 2440404.00000     0.174605559  -0.918888826  -0.398457537
 center of grav   -0.004503521  -0.000791360  -0.000276299

 2440404.20000     0.177936955  -0.918353811  -0.398225610
 center of grav   -0.004503445  -0.000792393  -0.000276744

 2440404.40000     0.181266392  -0.917808505  -0.397989225
 center of grav   -0.004503369  -0.000793427  -0.000277189

 2440404.60000     0.184593836  -0.917252912  -0.397748385
 center of grav   -0.004503293  -0.000794461  -0.000277634

 2440404.80000     0.187919251  -0.916687036  -0.397503091
 center of grav   -0.004503217  -0.000795494  -0.000278079

 2440405.00000     0.191242603  -0.916110881  -0.397253344
 center of grav   -0.004503141  -0.000796527  -0.000278524

 2440405.20000     0.194563856  -0.915524452  -0.396999145
 center of grav   -0.004503064  -0.000797561  -0.000278969

 2440405.40000     0.197882976  -0.914927751  -0.396740497
 center of grav   -0.004502987  -0.000798594  -0.000279414

 2440405.60000     0.201199926  -0.914320783  -0.396477399
 center of grav   -0.004502909  -0.000799627  -0.000279859

 2440405.80000     0.204514673  -0.913703551  -0.396209855
 center of grav   -0.004502832  -0.000800660  -0.000280304

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp