home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!roberts@cmr.ncsl.nist.gov
- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Newsgroups: sci.space
- Subject: Re: asteroids beyond Jupiter
- Message-ID: <BzyFFL.DwM.1@cs.cmu.edu>
- Date: 28 Dec 92 05:33:04 GMT
- Article-I.D.: cs.BzyFFL.DwM.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Lines: 40
- Approved: bboard-news_gateway
- X-Added: Forwarded by Space Digest
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
-
-
- -From: cain@geomag.gly.fsu.edu (Joe Cain)
- -Subject: Re: asteroids beyond Jupiter
- -Date: 27 Dec 92 18:56:46 GMT
- -Organization: Florida State University Geology Dept.
-
- ->In article <1992Dec24.193342.29953@hpcvaac.cv.hp.com>,
- ->billn@hpcvaac.cv.hp.com (bill nelson) writes:
- ->> My definition of asteriod is: any body that orginated in the
- ->> "asteriod belt" (between Mars and Jupiter). etc etc
-
- - Help! It would be useful to learn what are the "official" uses
- -of the words according the IAU (and IUGG?). I have a hard enough time helping
- -students try to keep meteor, meteorite, and meteoroid straight when
- -there seems to be general disagreement on the distinctions between the
- -meaning of the words asteroids, comets and, yes, planets. I posted
- -this question recently in sci.astro but so far no one has come to the
- -rescue.
-
- I posted a quote from a (1960s-1970s) astronomy textbook last week.
- Basically, "asteroid" and "minor planet" are considered synonyms.
- The speculation that some comets eventually become covered with tar, dust,
- etc. and become icy asteroids has tended to blur the distinction.
- Asteroids appear to have a variety of compositions.
-
- - Is anyone willing to demote Pluto/Charon to asteroid status,
- -change Chiron from "asteroid" to comet, buck public sentiment to
- -avoid naming a body orbiting mostly a little beyond Pluto "Planet X", or
- -think about the use of the term "worlds" that some seem to favor for
- -large bodies even if not orbiting the Sun?
-
- Fitting things into definitions is an attempt to simplify one's model of
- the universe. I'm not sure that's particularly useful in this situation.
- It seems more practical in this case to not take definitions too seriously -
- just treat them as a sort of loose and informal classification, and
- evaluate individual objects on a case-by-case basis. If you want to be
- more formal, you have to divide "asteroid" into at least three categories.
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-