Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from hogtown.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Mon, 28 Jan 91 02:17:55 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Mon, 28 Jan 91 02:17:50 -0500 (EST) Subject: SPACE Digest V13 #086 SPACE Digest Volume 13 : Issue 86 Today's Topics: Re: SPACE Digest V13 #041 IMDISP/Magellan Images Available Re: Why man rate? (was: space news from Dec 17 AW&ST) need ftp site list Re: Space Station Weights Re: Firm Fred Decisions Re: Ultimate Weapon Magellan Update - 01/24/91 Re: Galileo Trajectory Re: Firm Fred Decisions Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: 24 Jan 91 09:21:56 GMT From: soda.Berkeley.EDU!gwh@ucbvax.Berkeley.EDU (George William Herbert) Subject: Re: SPACE Digest V13 #041 In article <21004@crg5.UUCP> szabo@crg5.UUCP (Nick Szabo) writes: >The Jupiter system contains the most unique features of any in >our solar system. You might want to read my post of c. 2 weeks ago, in >which I showed how Jupiter's magnetic field can be tapped for electrical >energy at a cost of 1/10 of 1% of that on Earth or from Earth-orbiting >solar power satellites. This kind of energy is not available anywhere >else in the solar system. Fusion isotopes can be harvested from Jupiters' >atmosphere. All elements needed for life and most industry are >available. Heavy elements that could be scarce (Galileo may tell >us) can be introduced by capturing asteroids. The plentiful energy also >allows for new high-energy industries such as isotope and antimatter >production. Few points: Having had to research it's environment rather thoroughly not that long ago (one of my students wanted to do a manned mission to J. for their spacecraft design class project), i can say that it's a very difficult place to live. First, if you want to get down near the planet, you need a delta-V that can only be described as 'impossible' to get down and back again. The del-V to surface-synchronous orbit and back to (one of the middle moons, i can't remember which offhand) was something like 72 km/sec. We had to talk the student out of some very neat ideas because of this. Second, it's radiation belts are very, very nasty. You can shield, esp with magnetic shields, but it's not a very hospitable place. I will admit it has possibility. But only in Forwardian scales. == George William Herbert == * UNIX ate my last .sig, Waiting for Plan 9! * == JOAT for Hire: Anything, == ######### I do Naval Architecture, ########## ===+++ Anywhere, my price +++=== # Spacecraft Design, UNIX Systems Consulting # == gwh@soda.berkeley.edu == # RPG writing/development, and lots of other # == gwh@ocf.berkeley.edu == ## random stuff, of course. I'm a JOAT 8-) ## ------------------------------ Date: 24 Jan 91 07:54:12 GMT From: sdd.hp.com!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@ucsd.edu (Ron Baalke) Subject: IMDISP/Magellan Images Available ============ IMDISP 5.6 ============ Version 5.6 of the IMDISP program is now available via anonymous ftp. IMDISP is an interactive image display program with some basic image processing capabilities that runs on an IBM PC computer. It was originally written to be used with the Voyager images on CD-ROM's, and an older version of IMDISP has been distributed with the Voyager CD-ROM's in the past. This version of IMDISP is the most current one, and has been submitted to be included on the GRIPS '90 CD-ROM that is coming out shortly. IMDISP will support various video modes including CGA, EGA, VGA (recommended), and super VGA (highly recommended) for selected graphics boards. The program can display images in three formats: PDS/SFDU, FITS and VICAR. The PDS format was developed by the Planetary Data Systems, and the FITS (Flexible Image Transport) format is typically used for astrononmy images. The VICAR (Video Image Communication and Retrieval) format was developed at the Image Processing Lab at JPL. Peter Yee at Ames Research Center was kind enough to allow his computer site be used for anonymous ftp access. This site can be reached at: ames.arc.nasa.gov (128.102.18.3) The IMDISP program is stored in a file called IMDISP56.ZIP in the pub/SPACE/IMDISP subdirectory. This zip file can be unzipped with the public domain program PKUNZIP. IMDISP56.ZIP has three files in it: IMDISP.EXE - IMDISP program version 5.6 IMDISP.DOC - User's Guide for IMDISP PCDCOMP.EXE - Version 2.0 of the Voyager Image Decompression Program IMDISP.DOC will help in the use of IMDISP, and has some interesting overviews of CD-ROM fundamentals and image processing. The PCDCOMP program is to be used specifically to uncompress the Voyager images stored the CD-ROM into PDS, FITS or VICAR formats; this is the most recent version. Being one of the programmers of IMDISP, I am very interested on how people like the program. If you find any bugs in IMDISP then let me know and I will see that they get fixed. Also, any suggestions or ideas on improving the program will be appreciated. ================= MAGELLAN IMAGES ================= Two raw format Magellan images are also available for anonymous ftp. The two images are stored at the same Ames site listed above, and are in the pub/SPACE/VICAR directory under the names DSNALL.IMG and GOLUBKINA.IMG. The images have been released by the Magellan project at JPL, and are digital versions of images that have been previously released to the press. Both images are 8 bit images in VICAR format with a pixel resolution of 1024x1024, and are 1 megabyte in size. DSNALL.IMG is the "Crater Farm" mosaic which contains 24 orbits of data formed into one large mosaic. The dominating features in this mosaic are three huge craters. GOLUBKINA.IMG is a pseudo-oblique view of a crater from the very first strip of imagery received from Magellan. Note that both these images can be displayed with the IMDISP program. One thing to keep in mind when viewing these images, is that they are radar images and are to be interpreted differently from what we are normally used to seeing. Generally with radar images, dark areas indicate smooth surfaces, and the lighter areas indicate the surface is rough. Additional Magellan images will be added as they become available. ___ _____ ___ /_ /| /____/ \ /_ /| | | | | __ \ /| | | | Ron Baalke | baalke@mars.jpl.nasa.gov ___| | | | |__) |/ | | |___ Jet Propulsion Lab | baalke@jems.jpl.nasa.gov /___| | | | ___/ | |/__ /| M/S 301-355 | |_____|/ |_|/ |_____|/ Pasadena, CA 91109 | ------------------------------ Date: Fri, 25 Jan 91 08:07:58 -0500 From: "Allen W. Sherzer" Subject: Re: Why man rate? (was: space news from Dec 17 AW&ST) Newsgroups: sci.space Cc: In article : ++ There is no need to ask them. We HAVE sent people up on Delta's. Funny ++ how they managed to make it do something it was never intended to do :-). +I was under the impression that Redstones and Atlases were used for +Mercury, and Titans were used for Gemini (and of course Saturns for +Apollo and Skylab) -- am I missing something? Sorry about that. I did indeed mean to say Atlas. The point remains that humans use tools in unintended ways all the time. Allen -- +----------------------------------------------------------------------------+ |Allen W. Sherzer | America does best when it accepts a challenging mission. | | aws@iti.org | We invent well under pressure. Conversely, we stagnate | | | when caution prevails. -- Buzz Aldrin | ------------------------------ Date: 21 Jan 91 19:19:47 GMT From: hsdndev!dartvax!eleazar.dartmouth.edu!ack@handies.ucar.edu (Andy J. Williams) Subject: need ftp site list This has been asked before, this has been answered before... but I wasn't here when it happened. So, could someone please send me a list of ftp sites that carry gif, TIFF, PICT, anyformatatall, etc images from Voyager, Pioneer, Hubble, etc etc etc. Anything at all. Thanks! -Andy -- Andy J. Williams sNail: RFD 1 #268 echo "Hello." Consultant Guy Lebanon NH, 03766 setenv NAME 'Inigo Montoya' Kiewit Computation eMail: ack@dartmouth.edu you kill -9 my ppid Dartmouth College pHone: 603-646-3417 Prepare to vi. ------------------------------ Date: 21 Jan 91 20:01:07 GMT From: usc!cs.utexas.edu!news-server.csri.toronto.edu!utzoo!henry@ucsd.edu (Henry Spencer) Subject: Re: Space Station Weights In article <3196@polari.UUCP> crad@polari.UUCP (Charles Radley) writes: >...political discussions presented at length by LLNL. In particular I >found their political statements about the undesirability of >international collaboration as extraordinarily parochial and totally >at variance to todays global realities... I think LLNL's problem in this area is mostly that they're coming from a nuclear-military background, where the Soviets are the enemy and even European allies are suspect. I think their stance on this is realistic, but not for the reasons they advance. As long as the US insists that its international "partners" are not allowed to contribute anything vital to these "cooperative" projects -- e.g., both ESA and JSA contributing laboratory modules to Fred, because they weren't allowed to contribute anything crucial like the logistics module -- then international "collaboration" is mostly a frill, and an expensive and troublesome one. It is also expensive and troublesome for the "partners", since the US is such an unreliable and difficult boss. -- If the Space Shuttle was the answer, | Henry Spencer at U of Toronto Zoology what was the question? | henry@zoo.toronto.edu utzoo!henry ------------------------------ Date: 23 Jan 91 13:30:39 GMT From: sdd.hp.com!zaphod.mps.ohio-state.edu!malgudi!caen!blue.engin.umich.edu!sheppard@ucsd.edu (Ken Sheppardson) Subject: Re: Firm Fred Decisions In article <3194@polari.UUCP> crad@polari.UUCP (Charles Radley) writes: > >Delting the nodes and pressurized hab module appears to >make "safe Haven" rathr tricky......dos this mans mean the >Shuttle must remain attached when the station is manned ? Yes. If assembly is halted at MTC (Man Tended Configuration) the orbiter must remain attached whenever the station is manned. This is, in fact, pretty much the textbook definition of 'Man Tended' The next milestone after MTC is/was PMC - Permanently Manned Configuration. In this configuration the station would be able to support manned operations without an orbiter present. -- =============================================================================== Ken Sheppardson Email: kcs@sso.larc.nasa.gov Space Station Freedom Advanced Programs Office Phone: (804) 864-7544 NASA Langley Research Center, Hampton VA FAX: (804) 864-1975 =============================================================================== ------------------------------ Date: 24 Jan 91 12:55:54 GMT From: mcsun!ukc!edcastle!james@uunet.uu.net (J Gillespie) Subject: Re: Ultimate Weapon ihr@wuphys.wustl.edu (Ian H. Redmount) writes: >Schwarzschild black hole of circumference about 5.5cm---about the >size of a grape, as stated. Where can I get grapes that big ?? :-) ;-) >The largest black hole I ever heard conjectured was one of 10^15-10^16 >solar masses. The Schwarzschild radius of such a hole would be of the >order of a kiloparsec. The free-fall time from horizon to singularity >in such a hole is of the order of 1000 years [Misner, Thorne, and Wheeler, >op. cit., p. 836]: A civilization on a swallowed solar system could rise >from prescientific beginnings to the discovery of general relativity in >time to discern its fate! 8-) Interesting idea. Anyone done the calculations? :-) <----This is a smiley >Ian H. Redmount -- James Gillespie, /~~~~~~~~\ Edinurgh University. / @ @ \ "I'm not musical either - james@uk.ac.ed / < \ I play the bagpipes" ____________________/ \________/ \__________________________________________ ------------------------------ Date: 24 Jan 91 19:59:32 GMT From: snorkelwacker.mit.edu!usc!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@bloom-beacon.mit.edu (Ron Baalke) Subject: Magellan Update - 01/24/91 MAGELLAN STATUS REPORT January 24, 1991 The Magellan spacecraft and its radar system continue to perform nominally. All seven STARCALS (star calibrations) in the past 24 hours were successful with no star rejects. Yesterday, spacecraft controllers performed an extra desaturation of the reaction wheels (DESAT) to adjust the preload. This was to correct a condition in which the momentum buildup approached the alarm limits. The Radar System Engineering Team reports some recurring small gaps, ranging from 15 to 45 seconds, one gap per orbit, which have been observed in the recent radar data. An investigation in underway to determine whether the gaps result from the unique details of the present single tape recorder mode or problems at the DSN (Deep Space Network) station. It is definitely not a repeat of the problem which affected tape recorder "A". ___ _____ ___ /_ /| /____/ \ /_ /| | | | | __ \ /| | | | Ron Baalke | baalke@mars.jpl.nasa.gov ___| | | | |__) |/ | | |___ Jet Propulsion Lab | baalke@jems.jpl.nasa.gov /___| | | | ___/ | |/__ /| M/S 301-355 | |_____|/ |_|/ |_____|/ Pasadena, CA 91109 | ------------------------------ Date: 25 Jan 91 04:49:38 GMT From: usc!cs.utexas.edu!news-server.csri.toronto.edu!utzoo!henry@apple.com (Henry Spencer) Subject: Re: Galileo Trajectory In article <1991Jan9.153338.3646@cbnewsd.att.com> pauln@cbnewsd.att.com (paul.h.nelson) writes: >I know vaguely that because of cost considerations the present plan was >chosen to make use of gravity assist. However, it's still hard to visualize >how this is a faster and cheaper way to get to Jupiter--it's a much longer >path. Don't understand the distance, velocity, path, and fuel tradeoffs. In space, velocity is much more important than distance. It is mostly irrelevant that the path Galileo is taking is somewhat longer than the one originally planned. The important fact is that by doing several gravity-assist maneuvers, the velocity at launch -- inadequate due to the political unavailability of Shuttle-Centaur -- can be boosted to the point where it is adequate to get that lumbering elephant of a probe to Jupiter on a trajectory suitable for deceleration into Jupiter orbit at the end. This does increase the flight time, which is a concern because it gives more time for things to go wrong. It also involves some other annoying complications. It was, however, the only way. -- If the Space Shuttle was the answer, | Henry Spencer at U of Toronto Zoology what was the question? | henry@zoo.toronto.edu utzoo!henry ------------------------------ Date: 19 Jan 91 03:31:03 GMT From: pilchuck!amc-gw!thebes!polari!crad@uunet.uu.net (Charles Radley) Subject: Re: Firm Fred Decisions Delting the nodes and pressurized hab module appears to make "safe Haven" rathr tricky......dos this mans mean the Shuttle must remain attached when the station is manned ? ------------------------------ End of SPACE Digest V13 #086 *******************