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/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Thu, 8 Feb 90 01:40:38 -0500 (EST) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Thu, 8 Feb 90 01:40:19 -0500 (EST) Subject: SPACE Digest V11 #20 SPACE Digest Volume 11 : Issue 20 Today's Topics: NASA Headline News for 02/07/90 (Forwarded) Space Station Costs Re: Gravity Assist Mechanism Galileo Mission Schedule Re: Space Station Costs ---------------------------------------------------------------------- Date: 7 Feb 90 23:11:47 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 02/07/90 (Forwarded) ----------------------------------------------------------------- Wednesday, February 7, 1990 Audio: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Wednesday, February 7.... NASA Administrator Truly has told the House Science, Space and Technology Committee that any substantial cut in the FY '91 budget request for Space Station Freedom would more than likely force another "rescoping" and could result in the withdrawal of the program's international partners. Aerospace Daily reported that more than half the hearing yesterday was centered on space station funding. Committee Chairman Robert Roe of Michigan asked Truly what would result from a $500 million dollar reduction in the space station funding request. Truly said, "it would not be the Space Station Freedom as we know it today". The Administration's budget request for NASA for FY '91 is $15.1 billion. The Gamma Ray Observatory arrived at Kennedy Space Center yesterday after an early morning cross country flight. The spacecraft....one of the agency's four great observatories... will be placed in storage until August. The 17-ton scientific satellite will be launched aboard the orbiter Atlantis in November. A launch readiness review is being conducted at Kennedy Space Center today to discuss the center's readiness to launch the Atlantis. It precedes the two-day flight readiness review scheduled to begin Friday. An official launch date for the classified DOD mission is expected to be announced at the conclusion of the review. The current target date for the STS-36 launch is February 22. NASA Select TV will provide coverage of a news briefing at the Jet Propulsion Laboratory Saturday at 12 noon, Eastern time. the Galileo spacecraft will fly by Venus about 1:00 A.M., Eastern time, Saturday, and record scientific observations of the planet for playback in October. Galileo Project Manager Dick Spehalski, Project Scientist Torrence Johnson and Mission Design Manager William O'Neil will provide a comprehensive update on the spacecraft, its instruments and trajectory. The Japanese space agency successfully launched three satellites into orbit today using a single booster. The satellites will carry out a series of scientific investigations. * * * ----------------------------------------------------------------- Here's the broadcast schedule for public affairs events on NASA Select TV. All times are Eastern. Thursday, February 8.... 11:30 A.M. NASA Update will be transmitted Saturday, February 10.... 12 noon Galileo news briefing from JPL All events and times are subject to change without notice. ----------------------------------------------------------------- These reports are filed daily, Monday through Friday, at 12 noon, Eastern time. ----------------------------------------------------------------- A service of the Internal Communications Branch (LPC), NASA Heaequarters, Washington, D.C. ------------------------------ Date: 7 Feb 90 14:57:53 GMT From: mcsun!hp4nl!nikhefk!greg@uunet.uu.net (Greg Retzlaff) Subject: Space Station Costs The thing about the space station that has always made me wonder, is WHY it is so expensive. For a bare minimum you need a pressurized can, some electronics, living area, etc. What costs so much that the final price tag is about 15 billion dollars? Perhaps Henry (God bless his fingers) could break this cost down into about 10 areas so we could see where the pork is. Can you say gold plated? P.S. to Henry Spencer : Really enjoy your contributions to this group. Thanks for the AWST summaries! (from an expatriate Canuck from Saskatoon) ------------------------------ Date: 7 Feb 90 20:29:29 GMT From: sunlight!loren@lll-winken.llnl.gov (Loren Petrich) Subject: Re: Gravity Assist Mechanism In article <1990Feb7.133825.18100@axion.bt.co.uk> apengell@axion.bt.co.uk (alan pengelly) writes: > > [inquiry about how Gravity Assist works...] > > [Two theories: transfer of angular momentum from planet's rotation > and transfer of kinetic energy] How does it work. Consider the paths of the Pioneer and Voyager spacecraft near Jupiter. Here is what their motions looked like relative to the rest of the Solar System (forgive this awkward "plot"): \_ S --Jupiter S \ The spacecraft has sped up relative to Jupiter. This seems to violate some well-known Conservation Laws, but in reality Jupiter experiences some recoil from the spacecraft's gravity, slowing it down. But look at the situation again relative to Jupiter. Perform a vector subtraction and remove Jupiter's motion: \ S Jupiter S | The spacecraft dows not change speed between its initial and final states; only direction. But notice how the Jupiter and spacecraft velocities add. Initially, they are nearly perpendicular: not much change in magnitude. Finally, they are nearly parallel, clearly leading to a change in magnitude. A final comment. Jupiter's rotation had nothing to do with this maneuver. Any comments? ^ Loren Petrich, the Master Blaster \ ^ / loren@moonzappa.llnl.gov \ ^ / One may need to route through any of: \^/ sunlight.llnl.gov <<<<<<<<+>>>>>>>> lll-lcc.llnl.gov /v\ lll-crg.llnl.gov / v \ star.stanford.edu / v \ v "I'm just a spud boy looking for that real tomato" -- Devo ------------------------------ Date: 7 Feb 90 20:28:22 GMT From: cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@tut.cis.ohio-state.edu (Ron Baalke) Subject: Galileo Mission Schedule Galileo Schedule 10/18/89 - Launch from Space Shuttle 02/09/90 - Venus Flyby 10/**/90 - Venus Data Playback 12/08/90 - 1st Earth Flyby 05/01/91 - High Gain Antenna Unfurled 07/91 - 06/92 - 1st Asteroid Belt Passage 10/29/91 - Asteroid Gaspra Flyby 12/08/92 - 2nd Earth Flyby 05/93 - 11/93 - 2nd Asteroid Belt Passage 08/28/93 - Asteroid Ida Flyby 07/02/95 - Probe Separation 07/09/95 - Orbiter Deflection Maneuver 12/95 - 10/97 - Orbital Tour of Jovian Moons 12/07/95 - Jupiter/Io Encounter 07/18/96 - Ganymede 09/28/96 - Ganymede 12/12/96 - Callisto 01/23/97 - Europa 02/28/97 - Ganymede 04/22/97 - Europa 05/31/97 - Europa 10/05/97 - Jupiter Magnetotail Exploration Ron Baalke | baalke@mars.jpl.nasa.gov Jet Propulsion Lab M/S 301-355 | baalke@jems.jpl.nasa.gov 4800 Oak Grove Dr. | Pasadena, CA 91109 | ------------------------------ Date: 7 Feb 90 16:57:43 GMT From: zaphod.mps.ohio-state.edu!samsung!umich!ox.com!itivax!vax3!aws@tut.cis.ohio-state.edu (Allen W. Sherzer) Subject: Re: Space Station Costs In article <618@nikhefk.UUCP> greg@nikhefk.UUCP (Greg Retzlaff) writes: >The thing about the space station that has always made me >wonder, is WHY it is so expensive. IMHO, there are three big reasons: 1. Congress keeps cutting the funding every year or so. This drags out the time and adds to lifecycle cost. In addition, the cuts force NASA to (in effect) redesign the station every couple of years to live wiht the new funding realities. 2. NASA is forcing the station to be all things to all people. This makes the entire thing a kluge where every design decision helps one person but hurts 5 others. This was done to protect the station the same way NASA protected the shuttle in the 70's. Every program is forced to depend on it as much as they can even if it doesn't make sense. That way, killing the station kills many other programs which congress wants to keep. 3. NASA rolls over the project management and moves part of it around the country every couple of years. This means there has been no leadership, no 'guiding light' to provide continuity and keep things on track. Every new manager tosses out what was done before and starts over. >For a bare minimum >you need a pressurized can, some electronics, living >area, etc. What costs so much that the final price tag >is about 15 billion dollars? According to Lawrence Levermore National Laboratory, they can for the same $15 billion build an inflatable space station, moon base, and mars base. The stuff I have seen on it looks like a great way to bootstrap space colonization. Even if the price is off by an order of magnitude, it would still be 1/3 the cost of the NASA proposal. Allen ---------------------------------------------------------------------------- | Allen W. Sherzer | Cthulhu for President - | | aws@iti.org | If you're tired of choosing the LESSER of 2 evils | ---------------------------------------------------------------------------- ------------------------------ End of SPACE Digest V11 #20 *******************