Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr1/ota/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr1/ota/space/space.dl) (->ota+space.digests) ID ; Fri, 15 Sep 89 02:48:33 -0400 (EDT) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Fri, 15 Sep 89 02:48:13 -0400 (EDT) Subject: SPACE Digest V10 #43 SPACE Digest Volume 10 : Issue 43 Today's Topics: Re: Galileo Jovian atmospheric probe -- is it sterilized??? latest silly signature Re: Dynamics of Magnetically Driven Spacecraft Re: Face on Mars Re: Galileo Jovian atmospheric probe -- is it sterilized??? Re: Progress M-1 (new type of cargo craft) launched to USSR's Mir station PIONEER on Space Achievements stamp, not VOYAGER. ---------------------------------------------------------------------- Date: 5 Sep 89 05:51:22 GMT From: mailrus!jarvis.csri.toronto.edu!utgpu!utzoo!henry@tut.cis.ohio-state.edu (Henry Spencer) Subject: Re: Galileo Jovian atmospheric probe -- is it sterilized??? In article <1653@bucket.UUCP> leonard@bucket.UUCP (Leonard Erickson) writes: >It'd take a lot more than "running hot steam over it for a few hours." >... >I don't think the electronics would like that... Note that the arduous sterilization routine of the early Ranger missions was thought to have contributed to the awful reliability record of those missions... and those were probes that were designed for it. -- V7 /bin/mail source: 554 lines.| Henry Spencer at U of Toronto Zoology 1989 X.400 specs: 2200+ pages. | uunet!attcan!utzoo!henry henry@zoo.toronto.edu ------------------------------ Date: 5 Sep 89 06:02:18 GMT From: mailrus!jarvis.csri.toronto.edu!utgpu!utzoo!henry@tut.cis.ohio-state.edu (Henry Spencer) Subject: latest silly signature In article <14616@bfmny0.UUCP> tneff@bfmny0.UU.NET (Tom Neff) writes: >Annex Canada now! We need the room, \) Tom Neff > and who's going to stop us. (\ tneff@bfmny0.UU.NET Heh heh. You folks said roughly that early in 1812, just before you invaded us last time. By the end of that invasion, the only US soldiers still in Canada were POWs, three US armies had surrendered, and we had occupied Michigan and most of Indiana and Ohio. (The war went back and forth in various silly ways for a couple of years after, and ended up settling in at more or less the previous status quo.) The invasion of Canada was the most spectacular US military disaster in history, dwarfing Vietnam etc. Wanna try again? :-) :-) :-) -- V7 /bin/mail source: 554 lines.| Henry Spencer at U of Toronto Zoology 1989 X.400 specs: 2200+ pages. | uunet!attcan!utzoo!henry henry@zoo.toronto.edu ------------------------------ Date: 5 Sep 89 16:16:05 GMT From: usc!ginosko!aplcen!stda.jhuapl.edu!jwm@ucsd.edu (Jim Meritt) Subject: Re: Dynamics of Magnetically Driven Spacecraft In article <13250@reed.UUCP> reeder@reed.UUCP (Doug Reeder) writes: }I will be doing my senior thesis on the dynamics of magnetically driven }spacecraft, working out the equations of motion and so forth. Thus, I would }appreciate it if people would send me references }to related papers ond works. This would include papers on the dynamics of }solar sails and on the magnitude and direction of the magnetic field of both }the Earth and Jupiter at various altitudes. See Dick Tracey, specifically the "Magnetic Space Coupe" :-) "In these matters the only certainty is that nothing is certain" - Pliny the Elder These were the opinions of : jwm@aplvax.jhuapl.edu - or - jwm@aplvax.uucp - or - meritt%aplvm.BITNET ------------------------------ Date: 5 Sep 89 18:58:39 GMT From: zephyr.ens.tek.com!tekgen!tekigm2!timothym@uunet.uu.net (Timothy D Margeson) Subject: Re: Face on Mars In article <1989Sep1.213952.10631@agate.uucp> mkkuhner@codon1.berkeley.edu.UUCP (Mary K. Kuhner) writes: >There is a big problem with computer enhanced images of the Face, >Logically, what can computer enhancement do with such a picture? >It can fill in the black pixels with their adjacent color, which >definately makes the picture look better. Other than that, it is >not obvious that the picture can be improved. Where is the new >information coming from? Computer enhancement is good at removing >Mary Kuhner Hi, About computer enhancement of images... With some images, blurred especially, computer enhancement can make astoundeing improvements, with all the accuracy one wants, so long as you have a statistically sound sample to begin with. I once was at a convention on optical improvement techniques that are used in the intelligence community. The intent of this was to gain better reso- lution images from existing sattelite transmissions. And to get more from photographic sources. The images that come to mind that were most striking was that of a license plate on the back of a VW bug. The original photo was taken as a bank robbery suspect fled the scene of a crime, and a person who was standing near by holding a camera snapped a photo hurriedly. The photo was thought to be hopelessly blurred due to camera motion - I sure couldn't tell what was in the original photo - but the detectives contacted a specialty firm, had enhancements done and they were able to reconstruct the original image to a detail sufficient to read the license plate number!! So, even though the images of the face are poor to begin with, enhancements can make improvements in detail and resolution. I doubt that any really advanced techniques have been used on the face however due to the lack of funded scientific interest so most of the techniques used to date have some person "at the wheels" so to speak helping the process. What this person expects to see can certainly affect the final image. -- Tim Margeson (206)253-5240 PO Box 3500 d/s C1-022 @@ 'Who said that?' Vancouver, WA. 98668 e-mail replies to: timothym@tekigm2.MEN.TEK.COM ------------------------------ Date: 5 Sep 89 18:12:50 GMT From: eugene@eos.arc.nasa.gov (Eugene Miya) Subject: Re: Galileo Jovian atmospheric probe -- is it sterilized??? >Question of methods of sterilization. It is far simpler to keep any satellite clean during construction than to sterilize after the fact. There are fact sheets about environmental testing, etc. from JPL's PIO. I know, I got them when I wrote away for them in elementary school. You will also probably find books in the library now on spacecraft design and construction. And if you work at places like Huge Aircrash or Ford Aero-neurotic, you can find reams of stuff there. This is getting away from astronomy into space engineering. Another gross generalization from --eugene miya, NASA Ames Research Center, eugene@aurora.arc.nasa.gov resident cynic at the Rock of Ages Home for Retired Hackers: "You trust the `reply' command with all those different mailers out there?" "If my mail does not reach you, please accept my apology." {ncar,decwrl,hplabs,uunet}!ames!eugene Live free or die. ------------------------------ Date: 5 Sep 89 18:47:14 GMT From: usc!cs.utexas.edu!ut-emx!walt.cc.utexas.edu!wastoid@ucsd.edu (Feulner ... Matthew Feulner) Subject: Re: Progress M-1 (new type of cargo craft) launched to USSR's Mir station In article <1656@bucket.UUCP> leonard@bucket.UUCP (Leonard Erickson) writes: >szabonj@ibmpa.UUCP (nick szabo) writes: > >< (if technology permits) Mercury orbiter/lander. > >Actually, I'm not sure that *physics* will permit a Mercury orbiter. >I seem to recall seeing some figures that showed that the Sun's >attraction of anything in Mercury orbit is almost as great as that of >Mercury. At least at reasonable altitudes. Anybody else have figures? >If not I guess I'll have to calculate them myself and post. > >I am pretty sure that in any case an orbit around Mercury would be >highly perturbed! Actually, the sun's force on the moon is greater than the force from the earth. This doesn't stop the orbit from being near-circular, though. What matters is the "sphere of influence". This is generally accepted (from Lagrange) to be: Mplanet/Msun = (Rsphere/Rplanet)^(.4) Msun = mass of the sun Mplanet = mass of the planet in question Rsphere = sphere of influence around planet Rplanet = distance from sun to planet (This may not be correct, but it's at least close) There will always be an altitude under which a "stable" orbit will exist (I think). Matthew ------------------------------ Date: 5 Sep 89 19:06:33 GMT From: wrksys.dec.com!klaes@decwrl.dec.com (CUP/ASG, MLO5-2/G1 6A, 223-3283) Subject: PIONEER on Space Achievements stamp, not VOYAGER. jay@ncspm.ncsu.edu (Jay C. Smith) stated: "Voyager has already been featured on a [United States postage] stamp....There was a space achievements issue in 1981 that highlighted the new space shuttle...the block of eight stamps...also depicted... Voyager." This is incorrect. The planetary probe depicted on the Space Achievements issue is a PIONEER probe (either 10 or 11), not a VOYAGER. This would make the second time that PIONEER has been commemorated on a U.S. stamp. Larry Klaes klaes@wrksys.dec.com or - ...!decwrl!wrksys.dec.com!klaes or - klaes%wrksys.dec@decwrl.dec.com EJASA Editor, Astronomical Society of the Atlantic N = R*fgfpneflfifaL ------------------------------ End of SPACE Digest V10 #43 *******************