Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from corsica.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, 23 Jun 89 00:20:28 -0400 (EDT) Message-ID: Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Fri, 23 Jun 89 00:20:13 -0400 (EDT) Subject: SPACE Digest V9 #504 SPACE Digest Volume 9 : Issue 504 Today's Topics: Re: Venus & the Greenhouse effect.. Re^2: Getting news about China from space Re: A&E Apollo XI coverage? Re: NSS Space Hotline Update Re: (none) Contractors selected for Advanced Launch System studies (Forwarded) APOLLO 11 on Arts and Entertainment Channel. Re: UN Re: UN longitude/latitude receiver A&E Apollo XI coverage? Re: Chaotic Pluto == no Nemesis? Subject: Planetoid 1989 FC information. Geomorphology from Space Re: Orbital queries ---------------------------------------------------------------------- Date: 13 Jun 89 23:09:00 GMT From: usc!polyslo!csun!fedeva!premise!mirror!frog!john@elroy.jpl.nasa.gov (John Woods) Subject: Re: Venus & the Greenhouse effect.. In article <1989Jun8.054723.15609@utzoo.uucp>, henry@utzoo.uucp (Henry Spencer) writes: > In article <108671@sun.Eng.Sun.COM> fiddler%concertina@Sun.COM (Steve Hix) writes: > >Say, if we throw enough comets and other iceballs at Venus to get the > >water back, and if they're placed correctly, maybe we could get the > >planet's spin rate up some. > I saw, in JBIS I think, a proposal to use the half-dozen biggest > asteroids to kill two birds with one stone: blast most of the atmosphere > off into space and spin the planet up as well. You can guess how. :-) > Unfortunately, even the big asteroids are not really as big as one would > like for the job -- the "day" would still be a week or so long. Did they consider a slingshot around the Sun to increase the terminal velocity? Is that even possible? (If you ain't got enough m, try some v^2). On the other hand, being closer to the Sun and more rigid, the tidal slowing effect might be embarrasingly large in the middle run... -- John Woods, Charles River Data Systems, Framingham MA, (508) 626-1101 ...!decvax!frog!john, john@frog.UUCP, ...!mit-eddie!jfw, jfw@eddie.mit.edu People...How you gonna FIGURE 'em? Don't bother, S.L.--Just stand back and enjoy the EVOLUTIONARY PROCESS... ------------------------------ Date: 15 Jun 89 09:01:29 GMT From: mcvax!ukc!acorn!camcon!cpc@uunet.uu.net (Chris Cracknell) Subject: Re^2: Getting news about China from space seth@poopsie.UUCP (Seth D. Hollub) writes: >Spot probably can't detect individual soldiers, but may be able to detect >masses of people and things. US platforms can detect individuals. >Seth I believe that the best spatial resolution is achieved with satellites in steerable elliptical orbits, ie. making low-level passes over areas of interest. Spot and most other non-military remote sensing satellites fly at nearly constant altitude, in regular orbits. Bye. Chris Cracknell ------------------------------ Date: 16 Jun 89 19:37:51 GMT From: janus!bwood@ucbvax.Berkeley.EDU (Blake Philip Wood) Subject: Re: A&E Apollo XI coverage? In article <1274@garcon.cso.uiuc.edu> dpointer@uicsrd.csrd.uiuc.edu (David B. Pointer) writes: >I remember reading in sci.space 2 months ago about the Arts and Entertainment >cable channel's plans to rebroadcast the Apollo XI launch on June 16, the >moon landing on June 20, and the capsule recovery on June 24 (i.e., 20 >years to the day after each event happened). Well, I can't find the >broadcast listed today (June 16). Anyone know what happened? Did A&E >scrap their plans? Or was I just hallucinating? You're one month off. All these things happened in July 1969, not June. Blake P. Wood - bwood@janus.Berkeley.EDU Plasmas and Non-Linear Dynamics, U.C. Berkeley, EECS ------------------------------ Date: 16 Jun 89 22:47:21 GMT From: agate!web%garnet.berkeley.edu@ucbvax.Berkeley.EDU (William Baxter) Subject: Re: NSS Space Hotline Update In article <246900028@cdp>, jordankatz@cdp writes: >Stephania Follini, the woman who spent a record 130 days isolated >in a cave, was undergoing tests last week to determine the >philological effects of her long term isolation experiment. She must have spent more time reading than we were led to believe! William Baxter ARPA: web@{garnet,brahms,math}.Berkeley.EDU UUCP: {sun,dual,decwrl,decvax,hplabs,...}!ucbvax!garnet!web ------------------------------ Date: 15 Jun 89 15:11:00 GMT From: m.cs.uiuc.edu!s.cs.uiuc.edu!carroll@uxc.cso.uiuc.edu Subject: Re: (none) But why, for instance, limit them to 4Meg of memory, when it is known that that is just _not_ enough for UNIX in most cases, and certainly inadequate for X-windows? I can see why making memory cards is hard - I don't see why 8 (or 16) M is much harder than 4M. Alan M. Carroll "And there you are carroll@s.cs.uiuc.edu Saying 'We have the Moon, so now the Stars...'" CS Grad / U of Ill @ Urbana ...{ucbvax,pur-ee,convex}!s.cs.uiuc.edu!carroll ------------------------------ Date: 16 Jun 89 23:27:36 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: Contractors selected for Advanced Launch System studies (Forwarded) Jim Cast Headquarters, Washington, D.C. Jerry Berg Marshall Space Flight Center, Huntsville, Ala. RELEASE: 89-99 CONTRACTORS SELECTED FOR ADVANCED LAUNCH SYSTEM STUDIES NASA's Marshall Space Flight Center, Huntsville, Ala., has announced the selection of three firms for negotiations leading to award of contracts for systems definition studies of two proposed new liquid-propellant rocket engines. The definition study efforts are part of the Space Transportation Engine Program, which could lead to development of the rocket engines to meet requirements of the Department of Defense/NASA Advanced Launch System program and other future U.S. launch system needs. The Advanced Launch System is intended to provide, by the 1998-2000 time period, a dependable, reliable, high-capacity national launch capability while reducing by a factor of 10 the cost of placing payloads in Earth orbit. Each contract is expected to be valued at approximately $20 million and will be a 36-month effort. The firms selected for contract negotiations are Aerojet General Corp., Sacramento, Calif.; Pratt & Whitney Division of United Technologies Corp., West Palm Beach, Fla.; and Rocketdyne Division of Rockwell International, Canoga Park, Calif. The engines to be defined for the Space Transportation Engine Program are: o The Space Transportation Main Engine, which would use liquid hydrogen and liquid oxygen propellants and achieve a thrust level (in vacuum) of approximately 580,000 pounds. The main engine would be used in the Advanced Launch System core stage and might also be employed in a booster application. o The Space Transportation Booster Engine, which would use liquid methane and liquid oxygen propellants for a thrust (at sea level) of approximately 500,000 to 650,000 pounds. The booster engine is envisioned as a derivative of the Space Transportation Main Engine, rather than a unique design. A decision will be made later about whether this engine or the Space Transportation Main Engine will be used in the Advanced Launch System booster stage. The emphasis in systems definition of both engines will be on use of innovative designs and approaches that will yield higher reliability, lower production cost and lower operational cost in the resulting engines, compared to existing liquid propellant rockets. Both engines are to be designed for either reusable or expendable application. The definition study efforts will involve analyzing configuration options and associated tradeoffs and preparing preliminary designs, at the system, subsystem and component levels, for the two engine concepts. The three contracts to result from current negotiations will be closely coordinated with ongoing propulsion advanced development contracts aimed at demonstrating and providing sufficient maturity for new propulsion technologies which could be fed into the engine systems. A selection of firms for negotiations leading to contracts in that area was announced by NASA in March 1989. ------------------------------ Date: 16 Jun 89 22:19:00 GMT From: renoir.dec.com!klaes@decwrl.dec.com (CUP/ASG, MLO5-2/G1 6A, 223-3283) Subject: APOLLO 11 on Arts and Entertainment Channel. A&E will be broadcasting the news coverage done for APOLLO 11 in 1969, but it will be in July, *not* June as you wrote. APOLLO 11 was launched from Cape Kennedy (now Cape Canaveral again) on July 16, 1969, landed on the Moon July 20, and returned to Earth on July 24. Larry Klaes ------------------------------ Date: Fri, 16 Jun 1989 12:05-EDT From: Dale.Amon@H.GP.CS.CMU.EDU Subject: Re: UN > the Soviet Union, who repeated his Government's proposal for the > establishment > of a world space organization to oversee international activities in space > development. Ah those Terran Imperialists are at it again. Trying to make sure none of those future colonials get out from under their bootheels... ------------------------------ Date: Fri, 16 Jun 1989 12:10-EDT From: Dale.Amon@H.GP.CS.CMU.EDU Subject: Re: UN > P.S. ...and don't call me Libertarian, I'm a member of the Republican Party. You sound damn close. Sure you don't want to switch affiliation like Ron Paul (and a few other elected or formerly elected Republicans) did? I'd happily join my well armed vessel with yours in a mutual self-defense peace treaty. ie, blow to pieces anyone who attempts to raise our social consciousness at laser point... Just agree not to try to tax me for your part of the defense budget and don't ask what the 3 or 5 leaved plants in the hydroponics section are... :-) ------------------------------ Date: 16 Jun 89 17:14:29 GMT From: quintro!wde@lll-winken.llnl.gov (William D. Eaton) Subject: longitude/latitude receiver I need to know about equipment that will determine longitude and latitude. I have seen a demo on tv of a system that used a receiver and (I presume) a constellation of satellites. I'd like to know: A. How accurate is it ? (in feet or in seconds) B. How much does a receiver cost ? C. How much does a receiver weigh ? how big is it ? D. Who makes them ? & where can I get one ? I'd be obliged Bill Eaton ------------------------------ Date: 16 Jun 89 18:20:20 GMT From: uxc!garcon!uicsrd.csrd.uiuc.edu!dpointer@csd4.milw.wisc.edu (David B. Pointer) Subject: A&E Apollo XI coverage? I remember reading in sci.space 2 months ago about the Arts and Entertainment cable channel's plans to rebroadcast the Apollo XI launch on June 16, the moon landing on June 20, and the capsule recovery on June 24 (i.e., 20 years to the day after each event happened). Well, I can't find the broadcast listed today (June 16). Anyone know what happened? Did A&E scrap their plans? Or was I just hallucinating? *dave ---------------------------------------------------------------------- David Pointer Center for Supercomputing R&D dpointer@uicsrd.csrd.uiuc.edu 305 Talbot Lab 104 S. Wright St. (217) 244-6392 Urbana, IL 61801 ---------------------------------------------------------------------- ------------------------------ Date: 16 Jun 89 20:26:12 GMT From: rochester!dietz@cu-arpa.cs.cornell.edu (Paul Dietz) Subject: Re: Chaotic Pluto == no Nemesis? rehrauer@apollo.COM (Steve Rehrauer) writes: >I seem to recall a thread here some time ago about the "Nemesis" theory >of a large solar companion out in the hinterlands. If my oft-faulty >memory serves me this time, I seem to recall that the supporters of the >Nemesis idea have used "otherwise unexplainable" quirks in Pluto's orbit >as circumstantial evidence to support it. Well, no, since Nemesis, if it exists, would be about at apohelion now, perhaps two light years away. On the subject of Nemesis: Nature (6/8/89) has an article where some researchers claim to have found two nonstandard amino acids (isovaline and something else) in the clay for tens of centimeters above and below the KT boundary layer, but not actually in the boundary. These amino acids (found in both L and R forms) are found in carbonaceous meteorites, but are extremely rare on earth. To me, this find seems consistent with a comet shower. The earth would pick up dust particles shed by comets throughout the shower, and these small dust particles could perhaps decelerate gently enough in the upper atmosphere. The impact of a large comet with the earth would heat and destroy any organic matter in the comet. Paul F. Dietz dietz@cs.rochester.edu ------------------------------ Date: Fri, 16 Jun 1989 12:39-EDT From: Dale.Amon@H.GP.CS.CMU.EDU Subject: Subject: Planetoid 1989 FC information. > International Astronomical Union (IAU) Circular 4767 - 1989 April 7 PLEASE keep posting these!!! Does the IAU have any kind of BB where newly reported astronomical events, SN, Asteroids, etc are posted? That kind of information would be a data feast for us all. I usually have to dig through a number of publications to keep up with this kind of info. ------------------------------ Date: 15 Jun 89 18:18:26 GMT From: att!ihlpl!dbg@ucbvax.Berkeley.EDU (dbg) Subject: Geomorphology from Space > >In NASA SP-486, "Geomorphology from Space", pp. 432-433, is a list >of 15 possible origins of the Carolina Bays, including meteor swarms > . . >Incidently, this SP is really great. Try to get a copy. I would very much like to get a copy. Where do I look? Dave Green att!ihlpl!dbg ------------------------------ Date: 15 Jun 89 22:18:00 GMT From: ux1.cso.uiuc.edu!uxh.cso.uiuc.edu!jep@uxc.cso.uiuc.edu Subject: Re: Orbital queries Regarding #2: A rocket sitting on the launch pad at the equator has an easterly velocity due to the daily rotation of the earth of about 464 m/s (1038 mph). At latitude L it is 464 cos L m/s. To launch into an east-to-west (retrograde) orbit one would have to expend the fuel to cancel out this easterly velocity, rather than use it as a *freebie* for an easterly launch. A satellite in geosynchronous orbit is also travelling west-to-east, i.e. posigrade; it's just that the earth is rotating beneath it at exaclty the same angular velocity. To establish a polar orbit one must expend the fuel to exactly cancel the easterly velocity of the launch pad and then add a northerly (or southerly) orbital velocity. This is expensive in terms of fuel required and results in smaller payloads to orbit. It is accomplished by launching north-west. That's the reason U.S. polar orbit satellites are launched from Vandenberg AFB in California out over the Pacific Ocean. Wouldn't want to launch north-west from Cape Canaveral......TOO DANGEROUS! John E. Prussing Department of Aeronautical & Astronautical Engineering University of Illinois at Urbana-Champaign ...... jep@uxh.cso.uiuc.edu ------------------------------ End of SPACE Digest V9 #504 *******************