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 ; Sat, 21 Jul 1990 02:10:48 -0400 (EDT) Message-ID: <4adz79a00VcJE5YU5C@andrew.cmu.edu> Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Sat, 21 Jul 1990 02:10:18 -0400 (EDT) Subject: SPACE Digest V12 #104 SPACE Digest Volume 12 : Issue 104 Today's Topics: Crres launch to be carried live on NASA Select TV, transponder 5 [Corrected] (Forwarded) Twinkies in Space! Galileo Update - 07/20/90 NASA Headline News for 07/20/90 (Forwarded) Re: World Space Agency Re: Heavy Lift Titan Re: Is an asteroid capture possible/feasible? Re: Weather Control Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription notices, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: 20 Jul 90 18:15:45 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: Crres launch to be carried live on NASA Select TV, transponder 5 [Corrected] (Forwarded) Edward Campion Headquarters, Washington, D.C. July 19, 1990 (Phone: 202/453-1134) EDITORS NOTE: N90-55 CRRES LAUNCH TO BE CARRIED LIVE ON NASA SELECT TV, TRANSPONDER 5 The launch of the Combined Release And Radiation Effects Satellite (CRRES), scheduled for 3:33 p.m. EDT, Friday, July 20, will be carried live on NASA Satcom F-2R, Transponder 5, C-band, at orbital position 72 degrees West Longitude, frequency 3800.0 MHz, vertical polarization, audio monaural 6.8 MHz. Upon completion of the Space Station Freedom EVA Maintenance Study Results media briefing, scheduled for 3-5 p.m. EDT, Friday, July 20, a tape of the CRRES launch and the B-52 Space Shuttle Drag Chute Test, also scheduled for July 20, at Ames-Dryden Flight Research Facility, Edwards, Calif., will be played on NASA Select TV, Transponder 13. ------------------------------ Subject: Twinkies in Space! Date: Fri, 20 Jul 90 12:53:22 MESZ From: Joseph C Pistritto Mailer: Elm [revision: 64.9] > In article <61AE5D13B7BF60047E@vaxsar.bitnet>, Bill Higgins (HIGGINS > %FNAL.BITNET@UICVM.uic.edu) writes: > > > A typical > >Twinkie was selected, placed into a plastic bag, and attached to a 2-meter > >rope. Our centrifuge operator first practiced by whipping an inert object (a > >roll of masking tape) around his head on a rope. Once he could sustain constant > >angular acceleration of the desired magnitude, we began the Twinkie run. > > In which direction was the long axis of the Twinkie pointing, radial or > angular? This seems a rather important point, since it is likely that a > Twinkie is less resistant to acceleration effects along this axis than it's > short axis. > Or did you publish the results of incomplete research? Shades of Cold > Fusion!!! > While this might be an interesting point, it is not fundamental to the conclusions of the research, in particular, that it appears Twinkies (probably TM) can survive accelerations similar to those of launch. It was necessary only to prove that the Twinkie could survive in ANY configuration. Only in the event of a failure would subsequent testing be required for various configurations. What we have here is 'proof of concept', which is a less rigorous study than required for an actual design of a Onboard Twinkie Storage Unit (OTSU). This sounds like an excellent subject for follow-on (Phase B) research, to study the various axial configurations to determine the impact on important variables such as appearance, freshness, and storage life. In fact, perhaps we need a 'National Center for Convenience Food Research' to study the issue. I hear Utah is a good place for getting these things funded... -jcp- -- Joseph C. Pistritto (bpistr@ciba-geigy.ch, jcp@brl.mil) Ciba Geigy AG, R1241.1.01, Postfach CH4002, Basel, Switzerland Tel: +41 61 697 6155 (work) +41 61 692 1728 (home) GMT+2hrs! ------------------------------ Date: 20 Jul 90 16:28:57 GMT From: sdd.hp.com!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@ucsd.edu (Ron Baalke) Subject: Galileo Update - 07/20/90 GALILEO MISSION STATUS REPORT July 20, 1990 As of noon (PDT) Thursday, July 19, 1990, the Galileo spacecraft is 84,584,600 miles from the Earth and traveling at a heliocentric velocity of 51,270 miles per hour. The spacecraft's spin rate is at 3.15 rpm is in dual spin configuration. Round trip light time is 15 minutes, 12 seconds. A NO-OP command was sent on July 16 to reset the Command Loss Timer to 264 hours, the planned value for this mission phase. The Energetic Particles Detector (EPD) instrument was turned on and the motor successfully stepped on July 16 from Sector 4 to Sector O in preparation for the Trajectory Course Manuever-5 (TCM-5) on July 17. Contamination analysis has predicted that Sector O is the minimum contamination position for the EPD. Subsequent to the TCM-5 maneuver on July 17, the motor was stepped back to Sector 4. As part of both EPD stepping activities, EPD Memory Read Outs (MROs) were performed. After the MROs, the EPD was turned off. The sequence memory load for the TCM-5 maneuver was successfully transmitted and received by the Spacecraft on July 16. Successful execution of the TCM-5 maneuver occurred on July 17. Total spacecraft performance throughout the maneuver was near predicted levels. All Retropropulsion Module (RPM) pressures and temperatures were near expected levels; the Z thruster temperature profiles were similar to those of previous Z thruster burns. The L2B thruster temperature was inferred from the cluster temperature sensor readings. No unexpected cluster temperatures were observed. After the axial burn segment, a sequence planned pointing error correction was performed to reduce the error from about 4 mrad to near one-half mrad. No pointing error correction was needed after the lateral burn segment. Spin rate corrections were not needed following either the axial or the lateral burn segments. As previously reported the P1A temperature transducer appeared to be near failure. During the pointing correction following the axial segment of TCM-5 on July 17, the P1A temperature transducer immediately indicated full saturation (255 DN) after the very first pulse; it is still indicating 255 DN. Preliminary navigation data indicates a small overburn (about 2%) for the axial segment and an even smaller underburn (about 0.2%) for the lateral segment. Orbit determination data collection is in process. Cruise Science Memory Readouts (MROs) were successfully performed for the Extreme Ultraviolet (EUV), Magnetometer (MAG) and Dust Detector (DDS) instruments on July 16 and 19. The fifteenth RPM "flushing" activity was successfully performed on July 19. All 12 RPM thrusters were flushed during this activity. Detailed thruster temperature profiles are not available due to operation at 40 bps. Successful flushing was inferred from other spacecraft telemetry measurement/events including Attitude and Articulation Control Subsystem (AACS) performance and thruster counts. Commands were sent July 18 to perform a MAG instrument special MRO and a main power off/on cycle. These actions were taken to collect data to help understand the cause of recent MRO data anomalies first reported to project on July 13. Careful review of earlier MAG MRO data revealed some evidence of anomalous data visible in the June 8 MRO. Preliminary analysis of the special MRO revealed several memory miscompares in the executive portion of the MAG memory. Due to the memory miscompares the power off/on cycle was inconclusive in totally verifying the proper operation of the processor and logic circuitry. Further troubleshooting actions are being considered including a complete MAG memory reload. The cause of the memory miscompares is under investigation but may be related to a solar flare event on June 7. To date no other subsystem has reported any anomalous memory-related behavior. Interaction with the principal investigator has confirmed that the instrument is not at risk if the miscompares are due to transient events. The AC/DC bus imbalance measurements remained relatively stable with only slight variations observed during the TCM-5 maneuver. All other power-related and subsystem telemetry measurements were as expected. ___ _____ ___ /_ /| /____/ \ /_ /| | | | | __ \ /| | | | Ron Baalke | baalke@mars.jpl.nasa.gov ___| | | | |__) |/ | | |___ Jet Propulsion Lab | baalke@jems.jpl.nasa.gov /___| | | | ___/ | |/__ /| M/S 301-355 | |_____|/ |_|/ |_____|/ Pasadena, CA 91109 | ------------------------------ Date: 21 Jul 90 01:30:37 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 07/20/90 (Forwarded) ----------------------------------------------------------------- Friday, July 20, 1990 Audio Service: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Friday, July 20........ Kennedy Space Center technicians found two possible leak paths around a flange in the hydrogen fuel umbilical on the Space Shuttle Atlantis. The dye injected into the insulating foam around the flange revealed the leak source could be located in the flange area. A dye test will be performed today on the welds around the flange to see if there are any imperfections in them that might account for the leaks. No leaks were found when the Space Shuttle's external tank was pressurized yesterday. Engineers are gearing up for next Wednesday's supercold tanking test on the orbiter. ******** It takes just 15 minutes and 10 seconds to communicate with the Galileo spacecraft although it is now 84.6 million miles from Earth. Since the spacecraft departed from Venus last February, a series of maneuvers have slightly changed the velocity. It is now traveling more than 51,000 mph on its way toward Earth. The Earth flyby is scheduled for December 8, more than 500 miles above the western Atlantic. ******** A media briefing this afternoon will discuss the results of a 6- month study concerning external maintenance requirements for Space Station Freedom. The briefing will be held at NASA Headquarters and will be carried live on NASA Select TV at 3:00 P.M., EDT. Participating in the briefing will be Richard Kohrs, Director, Space Station Freedom, as well as Charles Price and William Fisher, M.D., Co-chairmen of the External Maintenance Task Team. ******** In other news, China's Ministry of Foreign Economic Relations and Trade yesterday approved the establishment of a branch of the China Aviation and Space Products Export Agency, according to Space Fax Daily via a Xinhua wire service. The story says the new branch will export more than 400 kinds of products including space technology. ******** Today is remembered as the anniversary of the first steps by a man on the moon. Astronaut Neil Armstrong walked on the moon on this day in 1969 as the whole world watched in amazement. --------------------------------------------------------------- Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are Eastern Daylight. Friday, July 20....... 2:30-3:00 P.M. Launch of the Combined Release and Radiation Effects Satellite aboard the Atlas Rocket. NOTE: Access Transponder 5, frequency 3800 MHz for the uninterrupted coverage. 3-5:00 P.M. News Briefing on Space Station Freedom External Maintenance requirements study results. 4:00 P.M. Immediately following the news briefing, a taped replay of the CRRES launch activity will be provided. (Note: There may be a time delay.) 5:00 P.M. B-52 Space Shuttle Drag Chute Test tape replay. (Note: There may be a time delay.) Tuesday, July 24...... 12-2:00 P.M. NASA Video Productions. 6-8:00 P.M. NASA Video Productions replay. Thursday, July 26..... 11:30 A.M. NASA Update will be transmitted. 2:00 P.M. Magellan Status Press Conference. A summary on the Venus encounter scheduled August 10. -------------------------------------------------------------- All events and times may change without notice. This report is filed daily, Monday through Friday at 12:00 P.M., EDT. This is a service of the Internal Communications Branch, NASA HQ. Contact: JSTANHOPE or CREDMOND on NASAmail or at 202/453-8425. -------------------------------------------------------------- NASA Select TV: Satcom F2R, Transponder 13, C-Band, 72 Degrees West Longitude, Audio 6.8, Frequency 3960 MHz. JSNEWS7-20 --------------------------------------------------------------- ------------------------------ Date: 20 Jul 90 15:52:52 GMT From: dd2f+@andrew.cmu.edu (Daniel Alexander Davis) Subject: Re: World Space Agency Ideally, an organisation of this kind would be independant of UN. It's funding wold have to be fixed for long periods of time, so it could plan, and it would have to recieve funding from a number of different governments... I think that about kills it. I would be happier with a subsidies organization which takes money from the government and gives it to groups with interesting ideas. Sounds Japanese. Dan Davis (is), the Repunzel of the Mathematics Department. Carnegie Mellon student Disclaimer - don't look at me, I'm also a music major, I don't have to know what I'm doing. dd2f+@andrew.cmu.edu(arpanet). ------------------------------ Date: 20 Jul 90 14:18:58 GMT From: serre@boulder.colorado.edu (SERRE GLENN) Subject: Re: Heavy Lift Titan In article <5479@itivax.iti.org> aws@vax3.iti.org.UUCP (Allen W. Sherzer) writes: >Heavy lift Titan or Delta. Can be available three years from word go. I feel obliged to point out again that this is fantasy (at least in the case of the Titan). Martin Marietta has proven that it has a hard time getting Titan projects turned out on time. Again, consider: The Titan IV, which required much less new engineering than a HLV would, was started in 1984. At that time, the only configuration to be flown was Tita/Centaur. It is now 1990 and the Titan/Centaur has yet to fly. In fact, it will not fly this year. 3rd and 4th cents: I do, however, think it would be a good idea to start building (or buying) capsules again. Does anyone know how much a Soyuz weighs? Again, how much does it cost the Shuttle to put a pound into LEO? (e-mail this one, please). --Glenn Serre serre@tramp.colorado.edu ------------------------------ Date: 20 Jul 90 15:47:31 GMT From: news-server.csri.toronto.edu!utgpu!utzoo!henry@rutgers.edu (Henry Spencer) Subject: Re: Is an asteroid capture possible/feasible? In article <9007192145.AA10884@ibmpa.paloalto.ibm.com> szabonj@ibmpa.UUCP (Nicholas J. Szabo) writes: >An extensive suite of mining and processing equipment is needed >to convert the asteroidal material into armatures that won't foul up >the mass driver. An imbalance at 10 km/s is not pretty. As I discussed at greater length in the space-tech mailing list, a mass driver -- as opposed to a railgun or various other electromagnetic-gun schemes -- does not need "armatures", since its magnetic interactions are with its recirculating payload-carrying "buckets". It will run fine on rock dust or liquid oxygen (not too hard to make from most rocks). -- NFS: all the nice semantics of MSDOS, | Henry Spencer at U of Toronto Zoology and its performance and security too. | henry@zoo.toronto.edu utzoo!henry ------------------------------ Date: 20 Jul 90 18:57:05 GMT From: groucho!steve@handies.ucar.edu (Steve Emmerson) Subject: Re: Weather Control In wmartin@STL-06SIMA.ARMY.MIL (Will Martin) writes: >So, a possible discussion: think of it as terraforming practice -- given >essentially unlimited resources (I can't see this being done "on the >cheap" :-), what actual mechanisms would be used to control the weather >from space? Something somewhat less drastic than asteroid bombardment to The basic necessity is to be able to add and/or remove very large amounts of heat from very large areas on weekly time scales. The addition of heat might be met by multiple, very large, IR or maser devices tuned to particular frequencies (e.g. the IR absorbtion frequency of water vapor). The removal of heat might be met by very large sunshades having variable opacity. Steve Emmerson steve@unidata.ucar.edu ...!ncar!unidata!steve ------------------------------ End of SPACE Digest V12 #104 *******************