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From: dsmith@HPLABSC (David Smith)
Newsgroups: net.space
Subject: Re: tenth planet
Message-ID: <8601091719.AA14496@hplabsc>
Date: Thu, 9-Jan-86 12:19:49 EST
Article-I.D.: hplabsc.8601091719.AA14496
Posted: Thu Jan  9 12:19:49 1986
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> As I recall, Voyager (I or II) detected the tenth planet.  It lies
> between Saturn and Uranus, and is rather small.  It has been named
> Charon, (Roman god that paddles the boat across the River Styx, I
> think).  This planet probably doesn't account for all of the
> perturbations of Uranus and Neptune, either.

Charon is Pluto's moon, and was discovered by earth-based telescope.

But, the four probes in the outer solar system (or beyond, if being farther
out than Neptune constitutes being beyond) are of value in finding planet
X, because their positions are more precisely known than those of the
planets.  Gravitational perturbations in their paths are more detectable.
Also, they might get closer than Neptune to planet X.

			David Smith
			hplabs!dsmith
			dsmith%hp-labs@csnet-relay