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 ; Tue, 5 Jun 1990 01:24:13 -0400 (EDT) Message-ID: <0aOo7UC00VcJIGpU4p@andrew.cmu.edu> Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Tue, 5 Jun 1990 01:23:45 -0400 (EDT) Subject: SPACE Digest V11 #491 SPACE Digest Volume 11 : Issue 491 Today's Topics: DSN Reliability and Resources Question T.A.F. -- Tough Apollo Trivia What happened to HST updates? NASA Headline News for 06/04/90 (Forwarded) Re: Space Sail Race Airliner that caused Delta delay Re: Doing something Re: Saturn V: Center S-I Engine shutdown? 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: 2 Jun 90 15:46:27 GMT From: amara!khai@uunet.uu.net (S. Khai Mong) Subject: DSN Reliability and Resources Question A bunch of simple questions: What are the resources of DSN in terms of dishes and sites? What is the expected reliability and redundancy during really critical periods? Could radio astronomy telescopes be pressed into service? Could the Soviet resources be used? -- Sao Khai Mong: Applied Dynamics, 3800 Stone School Road, Ann Arbor, Mi48108 (313)973-1300 (uunet|sharkey)!amara!khai khai@adi.com ------------------------------ Date: 4 Jun 90 21:37:07 GMT From: cs.utexas.edu!helios!chrisd@tut.cis.ohio-state.edu (Chris Duhon) Subject: T.A.F. -- Tough Apollo Trivia In the beginning -- "Let's go to the Moon." In the end -- "We went to the Moon!" But somewhere in the middle -- "Hey, how do we get there?!?" This is a qustion about some of the reasoning that went on when they were deciding about just how to get to the moon. Among the various options under consideration in the early 60's were 1) Direct Ascent - Just get a *really* big rocket and go straight from the earth to the moon, then straight back; 2) Earth Orbit Rendezvous - Use several smaller rockets to lift the spaceship in pieces, assemble while in earth orbit, then go; 3) Lunar Orbit Rendezvous - Take off in a medium sized rocket and go straight to the moon, but go into orbit around the moon when you get there, land a smaller, lighter craft, then leave it behind when you're ready to come back. Obviously option 3, Lunar Orbit Rendezvous, was the method decided upon. Since you didn't need to land the entire ship that you left Earth in on the moon, you could save fuel, and since you didn't have to return everything to Earth, you could again save fuel. And of course, saving fuel meant that you could save fuel. The question I have is this -- Why did they not use a combination of options 2 and 3. That is, launch the LM on one rocket, then launch the CSM (Command Service Module) on another, redezvous, then go. That might mean using half the fuel, rockets that were less powerful than the trouble plagued F-1's, and thus launch vehicles less complex and powerful than a Saturn V. Once it is decided to have *two* separate spacecraft and you have committed yourself to a deep-space rendezvous, then EOR seems to be a natural conclusion -- just lift those two craft separately. How 'bout it? chris -- | Chris J. Duhon | chrisd@photon.tamu.edu | Dept of Computer Science | | Texas A&M University | ------------------------------ From: gateh%CONNCOLL.BITNET@vma.cc.cmu.edu Date: Mon, 4 Jun 90 08:45:02 EDT X-Mailer: Mail User's Shell (6.4 2/14/89) Subject: What happened to HST updates? Did I miss something, or have the updates on the Hubble Space Telescope disappeared? I was really enjoying those... Gregg TeHennepe | Academic Computing Services | Yes, but this gateh@conncoll.bitnet | Connecticut College, New London, CT | one goes to 11... ------------------------------ Date: 4 Jun 90 18:23:13 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 06/04/90 (Forwarded) ----------------------------------------------------------------- Monday, June 4, 1990 Audio Service: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Monday, June 4........ Kennedy Space Center technicians continue to investigate the source of a hydrogen leak that caused managers to scrub the STS- 35 launch attempt on May 30. Based on information assessed last week, the launch team will not maintain a launch countdown posture and launch of STS-35 will not be scheduled at this time. ******** Yesterday, Administrator Truly delivered the commencement address for the inaugural graduation of the Mississippi School for Math and Science. The two-year public residential high school established by the Mississippi University for Women in Columbus, which is the oldest women's college in the state. The school is for academically-advanced students. The senior class president, Angela Lang, plans to co-op at Langley. ******** The General Services Administration announced today the selection and award of a lease contract for a new NASA Headquarters facility. The new 10-story building will be constructed between Second and Fourth Streets, S.W., about three blocks from the current location. The phased occupancy is scheduled to begin early in 1992. ******** New findings from the Voyager missions will be discussed in a news conference on June 6. Information about the outer planets and a portrait of the solar system taken by Voyager I last February will be provided. Dr. Carl Sagan and Voyager Project Scientist Dr. Edward Stone will make remarks. The conference will be carried live on NASA Select TV at 2:00 P.M. EDT. ******** The German-made Rosat satellite was successfully launched into orbit from Cape Canaveral, Florida at 5:47 P.M. EDT last Friday. Using data obtained from the telescope, an international team of astronomers will make the first in-depth map of X-ray sources throughout the entire sky. Rosat is the largest X-ray telescope ever built. ******** The Atlantic Canada Remote Sensing Committee announced the formation of a Western Canadian cooperative. Four western provinces of Canada will launch the Earth Environmental Space Initiative aimed at producing a cooperative space-based environment management system. --------------------------------------------------------------- Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are Eastern. Monday, June 4.......... 2:45 P.M. Neptune Encounter Highlights. Tuesdsay, June 5........ 12:00-2:00 P.M. NASA Video Productions. Birth and death of a star. Supernova 2 Life and the solar system. Robotics in the space station. Computer animation movies on the Earth and Mars. 1:30 P.M. Neptune Encounter Highlights. Wednesday, June 6....... 2:00 P.M. Voyager I Solar System "Family Portrait" news conference. Thursday, June 7........ 11:30 A.M. NASA Update will be transmitted. ----------------------------------------------------------------- All events and times are subject to change without notice. These reports are filed daily, Monday through Friday, at 12:00 P.M. EDT. This is a service of the Internal Communications Branch, NASA HQ. Contact: JSTANHOPE 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. ----------------------------------------------------------------- ------------------------------ Date: 4 Jun 90 17:56:10 GMT From: sdd.hp.com!uakari.primate.wisc.edu!aplcen!jhunix!ins_atge@ucsd.edu (Thomas G Edwards) Subject: Re: Space Sail Race In article <1990Jun2.140853.22787@watdragon.waterloo.edu> jdnicoll@watyew.uwaterloo.ca (Brian or James) writes: > > A few possibly foolish questions: How long will the race >take, what size payloads are we talking [minute, I expect], and >will there be any kind of sensors on the solar sail craft? The article seemed to indicate there would be a television camera, student experiments, and radio communication gear. There also is probably a good deal of guidance control mechanisms. 'Sailing' out of an Earth Orbit sounds like a fairly difficult maneuver. As to how long it will take, the article claimed it would take about as long as a chemical rocket. Remember, the sail is continually accelerating as it goes along (as opposed to most rockets which accelerate for a while can coast the rest of the way). -Thomas ------------------------------ Date: 4 Jun 90 23:01:11 GMT From: zaphod.mps.ohio-state.edu!usc!jarthur!aqdata!sullivan@tut.cis.ohio-state.edu (Michael T. Sullivan) Subject: Airliner that caused Delta delay Did anybody hear what happened to the crew of the airliner that caused the delay of the recent Delta launch? -- Michael Sullivan uunet!jarthur!aqdata!sullivan aQdata, Inc. sullivan@aqdata.uucp San Dimas, CA +1 714 599 9992 ------------------------------ Date: 5 Jun 90 03:23:10 GMT From: sdd.hp.com!zaphod.mps.ohio-state.edu!rpi!crdgw1!sixhub!davidsen@ucsd.edu (Wm E. Davidsen Jr) Subject: Re: Doing something In article <3517@calvin.cs.mcgill.ca> msdos@calvin.cs.mcgill.ca (Mark SOKOLOWSKI) writes: | I want to go to Venus NOW(!!!!) because we can do it right now with | our current technology. And the fact that I'm 20 doesn't mean I | have realism than you guys!!!!!!!!!! I want to go to Mars, because we have the ability to keep people alive on Mars now, while I'm not sure that we have the ability to keep them going on Venus. And I want to go now, because I'll be too old or too dead to appreciate it in 30 years. -- bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen) sysop *IX BBS and Public Access UNIX moderator of comp.binaries.ibm.pc and 80386 mailing list "Stupidity, like virtue, is its own reward" -me ------------------------------ Date: 4 Jun 90 16:53:21 GMT From: convex!dodson@uunet.uu.net (Dave Dodson) Subject: Re: Saturn V: Center S-I Engine shutdown? The real reason the center engine in the Saturn V was shut down early was the "pogo effect." During the first (unmanned) launch it was discovered that a longitudinal vibration of the structure occurred near the end of the first stage burn. The remedy, to keep the vibration safely within human endurance, was to shut the center engine down early. ---------------------------------------------------------------------- Dave Dodson dodson@convex.COM Convex Computer Corporation Richardson, Texas (214) 497-4234 ------------------------------ End of SPACE Digest V11 #491 *******************