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*From*: "Richard L. Bowman" <rbowman@Bridgewater.EDU>*Date*: Mon, 1 Apr 1996 06:25:22 -0500 (EST)

The latest orbital analysis (by Don Yeomans at JPL on Mar. 27, 1996 from

radar doppler data for March 24-25 gave the following values to 8 or 9

digits. (His calculations gave even more "significant??" digits.)

e = .999893259

q = .23020359

where e = eccentricity and q = closest approach to the Sun at perihelion

in AU.

I have not seen definitive results for the period of the comet other than

comments in the mass-media. In fact one of the last news reports from

one of the comet sites on the web, put the period at 10,000 years.

But with the above data, I thought I would calculate the semi-major axis

(a) and the period (p) for my Intro to Ast class using Kepler's third law

and a definition of eccentricity.

e = x/(2a) where x = distance between the foci of the orbit

2a = 2q + x => x = 2a - 2q and

e = 1 -(q/a) => a = q/(1-e)

From this result and the above values of q and e, I get

a = 2156.66 AU

Then from Kepler's third law (p^2 = a^3), I find

p = 100,155 yr

Have I made a bad assumption somewhere or is the report of a period of

10,000 yr off by a factor of 10?

Richard

-------------------------------------------------------------------------

Dr. Richard L. Bowman

Dept. of Physics e-mail: rbowman@bridgewater.edu

Bridgewater College phone: 540-828-5441

Bridgewater, VA 22812 FAX: 540-828-5479

"http://www.bridgewater.edu/departments/physics/physics.html";

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