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- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: asteroids beyond Jupiter
- Message-ID: <1992Dec26.045333.29799@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <BzuFB5.8nu@news.udel.edu>
- Date: Sat, 26 Dec 1992 04:53:33 GMT
- Lines: 27
-
- bjacobs@chopin.udel.edu (William J Jacobs) writes:
- : In article <1992Dec23.203536.6699@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- :
- : Just for the record, before we drop this thread entirely, the Illustrated
- : Encyclopedia of Astronomy and Space defines an asteroid as "A small rocky
- : body moving in an elliptical orbit around the Sun; asteroids are also called
- : minor planets" An asteroid that is currently orbiting within the asteroid
- : belt is called a "belt asteroid", naturally enough, one that is orbiting in
- : the orbit of Jupiter is called a "Trojan asteroid", "Apollo" and "Amor"
- : asteroids are in elliptical orbits that have perihelion within the inner
- : planets orbits (perihelion = closest aproach to the Sun). Planetoid is not
- : an accepted term in Astronomy.
-
- Thanks again, Bill. Definitions noted - I will use them in the future.
- I assume that the asteroids in the orbit of Jupiter are called "Trojan"
- because they are all at the two stable Trojan points in Jupiter's orbit.
-
- : A comet that got perturbed out of the Oort cloud and reperturbed into a near
- : circular orbit could be rightfully called a minor planet, but wouldn't be
- : called an asteroid because it's a chunk of ice not a rock. A pretty good
- : example of this is Chiron (not to be confused with Charon).
- :
- : That clear? Good.
-
- Yep, thanks.
-
- Bill
-