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Solex 10 estimate for Next Perihelion of C/1995 O1 (Hale-Bopp)
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Solex 10 (by Aldo Vitagliano)   http://chemistry.unina.it/~alvitagl/solex/
DE421   V!FG mode   (Adaptive stepsize, 18-bit, full precision)
*C/1995 O1 (this will load comet Hale-Bopp)
/ (Hide everything from search output but 0=Sun and E=C/1995 O1)
YS 0 (Sun) 200000 4600
Kevin Heider (user:kheider) and Chesnok 12-18-2009

Hale Bopp last came to perihelion in 1997, and JPL lists the current orbital peroid for Hale Bopp as 2533
years. But Hale Bopp will come to perihelion before 4530 (1997+2533) because the planets will perturb
(shorten) the semi-major axis and the orbital period of Hale Bopp.

Solex shows Hale Bopp making its closest approach to the Sun near Christmas day 4385. Due to all the
variables and possible perturbations from unknown bodies, this date should not be taken as exact.
This is only a best estimate.

  Conditions of minimum spatial distance
   #1     #2       Date        TT           JD2000       Dm (Gm)   V(km/s)  pImp  pDefl     pDa    pDn  Err(Gm)    long  (ø) lat     r1  (AU) r2
     0    14C   4385/12/25 07:05:31    871461.79550   137.454908  43.8912  2.28  99.99  + 99.99  99.99 0.000000 135.2342  49.4493  0.0000  0.9188 Sun       C/1995 O1