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- Path: sparky!uunet!dtix!darwin.sura.net!news.udel.edu!chopin.udel.edu!bjacobs
- From: bjacobs@chopin.udel.edu (William J Jacobs)
- Newsgroups: alt.folklore.urban
- Subject: Re: asteroids beyond Jupiter
- Message-ID: <BzotBu.M79@news.udel.edu>
- Date: 23 Dec 92 00:57:29 GMT
- References: <BzonA2.5rA@polaris.async.vt.edu> <1992Dec22.235420.19821@hpcvaac.cv.hp.com>
- Sender: usenet@news.udel.edu
- Organization: University of Delaware
- Lines: 56
- Nntp-Posting-Host: chopin.udel.edu
-
- In article <1992Dec22.235420.19821@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- >jfurr@polaris.async.vt.edu (Joel K. Furr) writes:
- >: In article <1992Dec22.185915.27317@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- >: >:
- >: >: Well, stay tuned. Object 1992QB1 is reckoned to be a good candidate for a
- >: >: distant (40-50 A.U.) minor planet and may be the first of many discovered at
- >: >: that distance.
- >: >
- >: >The statement was asteroid - not planetoid. The asteroids originate in the
- >: >asteroid belt. It is doubtful if any of them could be perturbed enough to
- >: >reach the orbit if Neptune.
- >: >
- >: >The planetoids are a different matter. It is possible that some of them
- >: >came from outside the Solar System. They could also have been formed just
- >: >about anywhere in the system, so the same limitations do not apply to
- >: >them. I would not argue that a planetoid could not have been captured
- >: >by Neptune - although the fact that Pluto has a moon makes this very
- >: >unlikely.
- >:
- >: No, Bill, you're wrong. There are many flat-out ASTEROIDS that orbit that
- >: far. You're not an astronomer, don't lecture us from a vacuum of knowledge.
- >
- >I could easily be wrong. This is AFU - after all.
- >
- >Guess I will have to do some study of the recent research. Do you have some
- >cites to simplify my astronomical task?
- >
- >Bill
-
- Well, this Bill is an astronomer, so I'll see if I can help out here. I'm
- afraid that I killed the thread that lead to this so all I know about your
- dispute is right here.
-
- First off, there is no reason an asteroid couldn't be perturbed enough to
- reach Neptune's orbit. I'll bet that plenty of asteroids get perturbed right
- out of the solar system. Any asteroids that were out there would be quite
- difficult to detect. I recall hearing of a few, but the theory was that they
- were comets knocked into a fairly circular orbit with a large radius, not
- from the asteroid belt at all.
-
- I'm not quite clear what a planetoid is. I guess you must mean a minor
- planet a.k.a. a big asteroid. The same limitations would apply to a
- planetesimal as to an asteroid. They're the same sort of thing really.
- I don't follow the capturing logic about Neptune and Pluto you state above,
- but I will say that capturing a stray body is a tricky business. You see,
- to go from a big orbit (wandering around the solar system) to a small one
- (around a particular planet) is to loose energy. The only ways to do that
- are to smack into something, or to take a dip into an atmosphere. Neither
- being a particularly likely or undisruptive event, this makes capture pretty
- unlikely.
-
- I'm going to dig around the thread for this note and see if I can figure out
- just what it is you folks are discussing.
-
- Bill Jacobs
- Actually I'm just a grad student, but close enough
-