home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: alt.folklore.urban
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!hpscit.sc.hp.com!cupnews0.cup.hp.com!news1.boi.hp.com!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: asteroids beyond Jupiter
- Message-ID: <1992Dec23.081502.3146@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <BzotBu.M79@news.udel.edu>
- Date: Wed, 23 Dec 1992 08:15:02 GMT
- Lines: 64
-
- bjacobs@chopin.udel.edu (William J Jacobs) writes:
- : >: >
- : >: 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.
-
- Would it be possible for Neptune to capture a perturbed asteroid? I highly
- doubt it. Admittedly, I am a little weak on celestial mechanics, so could
- easily be wrong.
-
- : 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 consider a planetoid to be any asteroid or small planet-like object that
- did not originate in the asteroid belt.
-
- : 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.
-
- Yeah - it would be a problem - unless the object originated in about the
- orbit of Neptune in the first place. I suspect that there would be the
- same problem with a perturbed asteroid - any such object would have to
- lose energy to be captured.
-
- : 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.
-
- I was disagreeing with the belief of some that Pluto was, at one time,
- an asteroid that was captured by Neptune.
-
- My other argument in opposition, was that the fact that Pluto has a moon
- would also eliminate the possibility. I guess that it is possible that
- Pluto and Chiron? could have once been the same body. That would eliminate
- this argument.
-
- : Bill Jacobs
- : Actually I'm just a grad student, but close enough
-
- Thanks, Bill.
-
- Bill "Oh no! Another Bill" Nelson
-