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Re: (meteorobs) Relativity
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Jean-Christophe 'Papou' Millot | Computer and network consultant.
email : papou@cipac.nc | Astronomy, Internet, Music, Movies.
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> De : Fuerst, Robert C. (Chris) <FUEC0@towanda.sylvania.com>
> A : 'meteor observers' <meteorobs@latrade.com>
> Objet : (meteorobs) Relativity
> Date : samedi 1 fivrier 1997 23:44
>
>
>
> Glenn,
> That depends on if you would want it's speed (velocity?)
related
> to something wouldn't it? Or it's basic trip speed (velocity) around the
> old sun? That starts to border on the Einstein train passenger
observation
> stuff. Anyhow, I believe the fastest speed would be somewhere in the
> middle of the elliptical orbit (if it returns), if it is parabolic or
> hyperbolic who knows for sure, not at the perihelion.
Kepler found in his second law for ellipses and then Newton found for any
conic section (elliptic, parabolic or hyperbolic) that the highest speed is
at the perihelion.
see
http://aya.ivv.nasadot gov/observe/exhibit/reference/module/orbits/orbit_sim.ht
ml
for a demo with a nice java applet
Hale-Bopp follows a - rather disturbed - ellipctical orbit.
from the last JPL hephemeris found at :
http://encke.jpl.nasadot gov/eph.html
Original and Future Orbital periods
By integrating the above orbit forward and backward in time until the comet
leaves the planetary system and then referring the osculating orbital
elements
to the solar system barycenter, the following orbital periods result:
Original orbital period before entering planetary system = 4200 years
Future orbital period after exiting planetary system = 2380 years
I could also be way
> off on this assumption that they follow a pendular-type motion. I have a
> list of periodic comets that has their name, period in years, inclination
in
> orbit, distance (not sure what that part measures), last (and number of)
> observed passages. My list only seems to go from 1884 to 1928 though and
> must be old as Halley is noted as last seen in 1910. If anyone is
> interested I could fax it (or post it) although it would be interesting
to
> see if there is a better list of comets on the web somewhere.
try G.Kronk's pages :
http://medicine.wustldot edu/~kronkg/periodic_comets.html
and you can also find elements of lots of comets on the web pages of
simulation sofware.
Hope this helps
Jean-Christophe