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 ; Wed, 5 Jun 91 01:28:21 -0400 (EDT) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Wed, 5 Jun 91 01:28:10 -0400 (EDT) Subject: SPACE Digest V13 #596 SPACE Digest Volume 13 : Issue 596 Today's Topics: Re: Orbital Elements for Galileo Existing investments and technology Re: SPACE station or NOTHING!!!!! Re: Tethers (was Re: Laser launchers) Dimensions of Shuttle bay wanted. Magellan: heartbeat loss response Re: Saturn V and the ALS Re: space news from March 18 AW&ST Re: SPACE STATION FREEDOM WOUNDED Toward 2001 - 20 May 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: 18 May 91 07:29:26 GMT From: ogicse!sequent!muncher.sequent.com!szabo@decwrl.dec.com Subject: Re: Orbital Elements for Galileo In article <910517.10434652.088899@RMC.CP6> Somers_PW@RMC.CA (Somers_PW) writes: > Would someone be able to provide the orbital elements for >Galileo. For which part of the flight? There are four sets of orbital elements for each segment of the EVEEJ, plus two slightly different sets after the atmospheric probe separation, plus the dozen or more orbital element changes that will occur when Galileo starts playing flyby with the Galilean moons. There are also several in-flight rocket burns which slightly adjust the elements. Orbital mechanics ain't so simple since computers and JPL came along. :-) -- Nick Szabo szabo@sequent.com "If you understand something the first time you see it, you probably knew it already. The more bewildered you are, the more successful the mission was." -- Ed Stone, Voyager space explorer ------------------------------ Date: 18 May 91 20:03:37 GMT From: haven.umd.edu!socrates.umd.edu!socrates!rockwell@louie.udel.edu (Raul Rockwell) Subject: Existing investments and technology Charles Frank Radley: >A personal disaster for me I might add, and thousands of skilled >aerospace workers who will become hamburger flippers. Fraering Philip: Personally I hope you find a good paying job somewhere. So far, to everyone out here it looks like we've paid billions already just for paper. Speaking of taking advantage of what we've already done... I haven't seen any postings on proposals to use existing missile launch vehicles as a springboard. I've seen articles at work (one of the major military contractors, either Northrup or Lockheed, has proposed scrapping a number of their long range missiles and using them as launch vehicles. Some of the people involved in the light launch vehicle business would rather this didn't happen because of economic stresses). Would any of the people in the know like to illuminate some of the details of this topic? Raul Rockwell ------------------------------ Date: 17 May 91 21:08:18 GMT From: van-bc!rsoft!mindlink!a684@ucbvax.Berkeley.EDU (Nick Janow) Subject: Re: SPACE station or NOTHING!!!!! kent@vf.jsc.nasa.gov () writes: > I feel that if the space station gets cut then NASA will never see that money > again. Space Science will NEVER see that money again. That's not necessarily true. If the hundreds of billions of dollars were wasted on what seemed like a space station version of the space shuttle (too expensive and not meeting its objective), the money wouldn't be available for any good, cost-effective projects and no one would ever trust NASA again. By cancelling the present project, the possibility of money for a more cost-effective project is still open for the future. > For people who did not want the station because it did not suit their > particlar project: Ow you have NOTHING! Without the money-sucking space station project, there's more money available for other projects, which were hurting from the tight budget. IMO, a series of unmanned probes like Gallileo provides a greater return than a badly mismanaged space station project. > You can't always get what you want..... so lets have nothing instead..... > what a mature solution! IMO, cancelling a flawed (mismanaged) project _is_ a more mature solution than accepting it because it's "glamorous". A bad project is a bad project. > Would you rather have the station or NOTHING. I'd rather see some small but well-planned, well-managed unmanned projects rather than see an orbiting embarrassment. ------------------------------ Date: 19 May 91 21:44:09 GMT From: cis.ohio-state.edu!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!news-server.csri.toronto.edu!helios.physics.utoronto.ca!aurora.physics.utoronto.ca!neufeld@tut.cis.ohio-state.edu (Christopher Neufeld) Subject: Re: Tethers (was Re: Laser launchers) In article <1991May19.175712.26570@helios.physics.utoronto.ca> neufeld@aurora.physics.utoronto.ca (Christopher Neufeld) writes: > Make it a 2000 km tether and the area taper drops to about 1500 for >HP-PE, with peak acceleration of about 5 gravities. 4000 km tethers >bring the area taper down to about 600, accn about 2 gravities. Note >that in these figures the 500 m/s velocity of the surface of the Earth >is included. > I should point out that I was using the same conditions as Walter's original calculations here, since I didn't want to confuse the comparison. When you include the tidal forces and the curvature of the orbit of the tether around the Earth you get, for the 4000km tether, about an area taper of 1600. The curvature of the orbit helps, but the tidal forces hinder. The explicit expression for the area taper is: Amid / Atip = exp { (rho/Y) * [ w^2 L^2/8 - W^2 r_orb * L/2 + G M_earth * (1/(r_orb-L/2) - 1/r_orb)]} where rho/Y is the volumetric density divided by the breaking strain of the cable material, in s^2/m^2, w is the angular velocity of the rotation of the tether, W is the angular velocity of the revolution of the tether about the Earth, L is the total length of the tether, and r_orb is the nominal distance from the centre of the Earth to the middle of the tether. rho/Y has roughly these values: Nylon: 1.1e-6 Carbon: 6.0e-7 Aramide: 5.3e-7 HP-PE: 3.1e-7 -- Christopher Neufeld....Just a graduate student | There no place like $FC58 neufeld@aurora.physics.utoronto.ca Ad astra! | They're $FF69-ing my cneufeld@{pnet91,pro-cco}.cts.com | every word! Send for a "Don't edit reality for the sake of simplicity" | free $A56E. ------------------------------ Date: 19 May 91 02:53:30 GMT From: van-bc!rsoft!mindlink!a1003@ucbvax.Berkeley.EDU (Ralph Busch) Subject: Dimensions of Shuttle bay wanted. Hi! I'm in need for the dimensions of the space shuttle bay. Actually, if anyone has figures on the size of "canisters" that the Space Station Freedom was going to be made of, that would be really handy! Also, if you have the figures for the soviet shuttle, that'd be nice, but not necessary. Please e-mail responses, thanks! -- Ralph Busch -- live from lotus land! Coordinates: 49N19' 122W48' (That's in Canada, BTW!) a1003@mindlink.bc.ca or Ralph_Busch@mindlink.bc.ca ------------------------------ Date: 18 May 91 18:31:30 GMT From: agate!bionet!uwm.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!ub!ubvmsc.cc.buffalo.edu!v096my2q@ucbvax.Berkeley.EDU (Mark A Wieczorek) Subject: Magellan: heartbeat loss response Has anyone been reading the magellan status reports? I keep coming across this term --- Heartbeat loss response --- and have no idea of what it is except that is has to be reset once in a while, especially during emergencies. Anyone have any ideas? Mark Wieczorek ------------------------------ Date: 19 May 91 00:17:23 GMT From: agate!lightning.Berkeley.EDU!fcrary@ucbvax.Berkeley.EDU (Frank Crary) Subject: Re: Saturn V and the ALS In article <1991May17.135458.12714@iti.org> aws@iti.org (Allen W. Sherzer) writes: >I thought Soyuz was just a tad bit too heavy for Atlas. Thanks for the >correction; that will save another $100M per launch. > It is too heavy for an Atlas. I should have said an Atlas II, which CAN launch it. This doesn't effect the launch cost much, however. Frank Crary UC Berkeley ------------------------------ Date: 18 May 91 23:11:58 GMT From: mintaka!olivea!samsung!uakari.primate.wisc.edu!dali.cs.montana.edu!milton!wiml@bloom-beacon.mit.edu (William Lewis) Subject: Re: space news from March 18 AW&ST In article <1991May10.034743.29351@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes: >Stafford group will strongly back restarting nuclear-rocket programs for >use in Mars exploration. Both nuclear-thermal and nuclear-electric systems >are of interest, but nuclear-thermal looks most promising for openers: it >offers a high enough exhaust velocity to make fast trajectories possible, ^^^^^^^^^^^^^^^^^ >greatly reducing worries about radiation and free-fall effects, and it has >enough thrust to make far more abort modes available in case of trouble. What does a "fast trajectory" mean? Faster than a Hohmann orbit? Or faster than some other orbit I'm not familiar with? How much time would this hypothetical trajectory take, and how picky is it about planetary alignments? Inquiring minds want to know ... -- wiml@milton.acs.washington.edu Seattle, Washington (William Lewis) | 47 41' 15" N 122 42' 58" W "Just remember, wherever you go ... you're stuck there." ------------------------------ Date: 18 May 91 23:19:51 GMT From: agate!bionet!uwm.edu!zaphod.mps.ohio-state.edu!usc!jarthur!nntp-server.caltech.edu!dullea.ipac.caltech.edu!krs@ucbvax.Berkeley.EDU (Karl Stapelfeldt) Subject: Re: SPACE STATION FREEDOM WOUNDED In article <1991May18.083622.20135@sequent.com> szabo@sequent.com writes: >(many other points deleted) > >But you are perfectly correct that having to use the "manned" >euphimism is a symptom of something terribly wrong. With the >latest Congressional action saving SIRTF and AXAF, ... > ^^^ > Saved from what ? The President's budget included funds for both of these projects, as well as EOS, CRAF, increases for NSF, and the space station. Congress decided on its own to cut the allocation for the independent agencies; thus the subcommittee "saved" the science projects from itself. Did any science programs get more money in the House subcommittee than they would have in the President's budget ? I think all the increases to NSF that Traxler speaks of are just what the President was asking for anyway, and do not represent a dividend from the attempt to cancel the space station. Karl Stapelfeldt krs@ipac.caltech.edu ------------------------------ Date: 18 May 91 19:48:28 GMT From: cis.ohio-state.edu!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!pitt!nss!freed@tut.cis.ohio-state.edu (Bev Freed) Subject: Toward 2001 - 20 May *********** TOWARD 2001 *********** Week of 20 May 1991 A Weekly Feature of SPACE CALENDAR + = Domestic (USA) Earth event * = Domestic (USA) space event o = International Earth event # = International space event -------------------------------------------------------------------- REPRINT INFORMATION This information is reproduced by permission of the Space Age Publishing Company. All rights reserved. Copyright May 20, 1991. Reproduction in any form without written permission violates federal statute with penalty of up to $50,000. SPACE CALENDAR is edited and published on the Big `Space' Island of Hawaii. ==================================================================== * * * * * * * + OV-105 Endeavour NASA Kennedy Space Center FL A full year of work, including installation of the three Space Shuttle Main Engines and overall systems integration, is waiting for Endeavour following its arrival at KSC on 7 May. * * * * * * * + Orbital Communications Corp Fairfax VA The OSC subsidiary signed its first agreement relating to Orbcomm services, the company's proposed small satellite mobile messaging system, with Telecommunicaciones de Caracas of Venezuela. * * * * * * * o Soviet Space Budgets Moscow USSR Spending for the coming five years (1991-95) is tentatively set at about 15 billion rubles, compared with 31.6 billion rubles for the previous 5-year period. A senior Soviet official said the 1991-95 figure would be boosted by 30-40 percent when military space programs are added in. * * * * * * * + Spaceport Florida Authority Cocoa Beach FL First launch from the Cape San Blas suborbital facility in the state's panhandle must await an "interagency review" of the authority's environmental assessment. Spokesman Edward Ellegood told Space Calendar the process "typically takes 90 days." * * * * * * * + USA / China Technology Transfer Washington DC The Bush administration will not block shipment of two Hughes satellites to China for launch aboard Chang Zheng rockets. The satellites will become part of Australia's Aussat system. * * * * * * * o Aussat on the Block Canberra, Australia A representative of the Australian federal government says "first and final" bids for Aussat are expected by October 1991. Australia's secretary of Transportation and Communications, Graham Evans, said there were "enough serious bidders to make a serious sale." * * * * * * * + SDI / Star Wars Funding Cut Washington DC The Congressional Armed Services Subcommittee slashed $1.7 billion from the Bush administration's budget request. Supporters claim it's still early in the budget game. * * * * * * * o Royal Astronomical Society London, England Discovery of a "BL Lacerta object" in a non-elliptical galaxy will throw current theories about the phenomenon into doubt, the Society said recently. The anomalous object was found by six astronomers using the 4.2 m Herschel Telescope in the Canary Islands. * * * * * * * o Japan Satellite Market Tokyo By the year 2004, Japan's market for radio and television, corporate communications, and long-distance telephone services via satellite will be worth about 2 trillion yen (US$14.4 billion). In 1994 Satellite Japan Corp will join Japan Communications Satellite Corp and Satellite Communications Corp in the marketplace. * * * * * * * + Lunar Footnote (Statistic) 6,731 Days since Moon last visited by humans. * * * * * * * o International Space Year 1992 (Quotation) "The most important policy objective of the ISY . . . is to instill a new Space Age frame of reference in the thoughts and actions of governments and individuals." -- The late U S Senator Spark M Matsunaga, Hawaii -------------------------------------------------------------------- ABOUT SPACE CALENDAR Space Calendar provides a weekly preview of upcoming events in the space industry. It is published weekly by the SPACE AGE PUBLISHING COMPANY from offices in Kailua-Kona, Hawaii. For a free sample of the printed publication, use the address, telephone, or fax numbers for the Hawaii office listed below. SPACE AGE PUBLISHING COMPANY also publishes SPACE FAX DAILY from its offices in Cupertino, California. For information about SPACE FAX DAILY use the address, telephone, or fax numbers for the California office listed below. HAWAII OFFICE: 75-5751 Kuakini Highway, Suite 209, Kailua-Kona HI 96740; 808-326-2014, fax 808-326-1825. CALIFORNIA OFFICE: 20431 Steven Creek Blvd, Cupertino CA 95054; 408-996-9210, fax 408-996-2125. ==================================================================== --- Opus-CBCS 1.14 * Origin: NSS BBS - Ad Astra! (412)366-5208 *HST* (1:129/104.0) -- Bev Freed - via FidoNet node 1:129/104 UUCP: ...!pitt!nss!freed INTERNET: freed@nss.FIDONET.ORG ------------------------------ End of SPACE Digest V13 #596 *******************