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 ; Fri, 15 Feb 91 01:26:40 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Fri, 15 Feb 91 01:26:30 -0500 (EST) Subject: SPACE Digest V13 #147 SPACE Digest Volume 13 : Issue 147 Today's Topics: Magellan Update - 02/11/91 Two more CRRES release windows Galileo Update - 02/11/91 Re: Kevlar (was: Manoeuvring using rope and anchor) O(n) n-body simulation? Feng Zaho? Re: Confusion regarding "Firm Fred Decisions" COPUOS Re: O(n) n-body simulation? Feng Zaho? Mir sweepstakes When will there be 'TAU'? (was Re: The edge of the solar system) 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: 11 Feb 91 22:49:33 GMT From: elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@decwrl.dec.com (Ron Baalke) Subject: Magellan Update - 02/11/91 MAGELLAN STATUS REPORT February 11, 1991 The Magellan spacecraft is performing nominally. All STARCALS (star calibrations) and DESATS (desaturatons of the reaction wheels) of the past weekend were successful. Magellan is now in its 988th mapping orbit and the radar system performance is nominal. The temperatures are continuing a warming trend, not leveling off as was expected. Battery #1 is now peaking at 25.1 degrees Celsius, so its alarm limit was reset to 28 degrees. The battery heaters are not operating now because the thermal cycle does not drop low enough to activate the heaters. Later today, an update to the Radar Control Parameter File will be sent to the spacecraft. The regular weekly command sequence, M1044, will be sent late tomorrow. Commands to implement Test #3 of the on-board tape recorder "A" are planned for uploading on Wednesday, February 13. ___ _____ ___ /_ /| /____/ \ /_ /| Ron Baalke | baalke@mars.jpl.nasa.gov | | | | __ \ /| | | | Jet Propulsion Lab | Is it mind over matter, ___| | | | |__) |/ | | |___ M/S 301-355 | or matter over mind? /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | Never mind. |_____|/ |_|/ |_____|/ | It doesn't matter. ------------------------------ Date: Mon, 11 Feb 1991 19:05:50 CST From: REIFF@SPACVAX.RICE.EDU (Pat Reiff (713)527-8750-2650) Subject: Two more CRRES release windows X-Vmsmail-To: SMTP%"space+@andrew.cmu.edu" CRRES NEWS FEBRUARY 10, 1991 The next window for CRRES release is February 12, 1991 at the discrete times 0315, 0345, 0415, 0445, 0515, 0545, 0615, 0645 and 0715. [NOTE - THIS IS UT; subtract 6 hours for CST, etc...PR] For this window G-6 [Lithium] will be prime. The Feb 14 release has windows every half hour 0430 - 0830 UT. For the February 14 window, G-8 [large Barium] will be prime since we have Millstone Hill Radar coverage only for the first hour of the window (A matter of ability to see the field-line foot, not a matter of scheduling). The most recent orbital elements and predicted elements for February 12 are listed below, plus look directions for Houston. David L. Reasoner, Project Scientist, MSFC [Recall hotline number (205)544-5356 for latest information] CSTC ORBIT DETERMINATION FOR 02/09/91 AND PREDICTED ELEMENTS FOR FEB 12 CSTC0209; the satellite name string CSTC ELEMENTS FOR 02/09/91 ; element set description 1991; the epoch year (YYYY) 40.570821759; the epoch day (DDD.dddd) 18.141661716; orbital inclination (degrees) 325.45852390; right ascension (degrees) .71356199690; eccentricity 351.87114906; argument of perigee (degrees) 2.438631995 ; mean motion (orbits/day) 12.938751848; mean anomaly (degrees) 23331.152539; semi-major axis (km) .000044765 ; decay (ndot2 orbits/day**2) 1; decay flag (0=no, 1=yes) 0. ; beacon frequency (MHz) 485 ; orbit number at epoch 0; orbit base (0=perigee, 1=equator) 0. ; nddot6 or Bahn latitude 0. ; drag or Bahn longitude 2; 0=SSI, 1=Bahn, 2=SGP, 3=SGP4/SDP4 CSTP0212; the satellite name string CSTC PRED. ELEM. 02/12/91 ; element set description 1991; the epoch year (YYYY) 43.0000 ; the epoch day (DDD.dddd) 18.13092 ; orbital inclination (degrees) 324.52637 ; right ascension (degrees) .7136593 ; eccentricity 353.53639 ; argument of perigee (degrees) 2.438695321 ; mean motion (orbits/day) 345.57657 ; mean anomaly (degrees) 23327.414651; semi-major axis (km) .000046666 ; decay (ndot2 orbits/day**2) 1; decay flag (0=no, 1=yes) 0. ; beacon frequency (MHz) 490 ; orbit number at epoch 0; orbit base (0=perigee, 1=equator) 0. ; nddot6 or Bahn latitude 0. ; drag or Bahn longitude 2; 0=SSI, 1=Bahn, 2=SGP, 3=SGP4/SDP4 -------- Silicon Ephemeris V3.00 Copyright (C) Silicon Solutions, Inc. observer(s): HOUSTON object(s): CSTP0212 [For other locations, *very roughly*, increase the elevation by (30 deg - your latitude); increase the azimuth by (95 deg - your W. longitude)] elev azim range lat lon height beacon ________ utc _______ deg deg km deg deg km Mhz or/sq phi Tue 12Feb91 03:15:00 52.2 128.5 29589 7.9 -70.9 28474 0.0000 491 74 Tue 12Feb91 03:45:00 53.1 133.8 31765 6.3 -73.2 30688 0.0000 491 87 Tue 12Feb91 04:15:00 54.0 140.0 33283 4.9 -76.1 32250 0.0000 491 100 Tue 12Feb91 04:45:00 54.7 146.8 34199 3.5 -79.3 33201 0.0000 491 113 Tue 12Feb91 05:15:00 55.0 154.0 34548 2.1 -82.6 33566 0.0000 491 126 Tue 12Feb91 05:45:00 54.8 161.2 34346 0.8 -85.9 33352 0.0000 491 139 Tue 12Feb91 06:15:00 53.9 168.1 33591 -0.6 -89.2 32554 0.0000 491 152 Tue 12Feb91 06:45:00 52.4 174.3 32268 -2.1 -92.2 31154 0.0000 491 165 Tue 12Feb91 07:15:00 50.3 179.2 30343 -3.8 -94.7 29114 0.0000 491 178 Tue 12Feb91 07:45:00 47.5 182.4 27760 -5.6 -96.5 26378 0.0000 491 191 Tue 12Feb91 08:15:00 43.9 183.1 24438 -7.7 -97.1 22854 0.0000 491 204 Tue 12Feb91 08:45:00 38.8 180.2 20272 -10.3 -95.3 18405 0.0000 491 217 Tue 12Feb91 09:15:00 29.7 170.4 15206 -13.7 -88.4 12817 0.0000 491 230 Tue 12Feb91 09:45:00 3.7 145.2 10034 -17.9 -65.8 5865 0.0000 491 243 Silicon Ephemeris V3.00 Copyright (C) Silicon Solutions, Inc. observer(s): HOUSTON object(s): CSTP0214 elev azim range lat lon height beacon ________ utc _______ deg deg km deg deg km Mhz or/sq phi Thu 14Feb91 04:30:00 62.7 167.8 29278 7.3 -90.5 28691 0.0000 496 75 Thu 14Feb91 05:00:00 61.6 174.3 31488 5.7 -92.9 30845 0.0000 496 88 Thu 14Feb91 05:30:00 60.2 181.4 33064 4.3 -95.8 32353 0.0000 496 101 Thu 14Feb91 06:00:00 58.4 188.4 34052 2.9 -99.0 33252 0.0000 496 114 Thu 14Feb91 06:30:00 56.2 195.0 34481 1.5 -102.3 33566 0.0000 496 127 Thu 14Feb91 07:00:00 53.6 200.7 34358 0.1 -105.6 33302 0.0000 496 140 Thu 14Feb91 07:30:00 50.7 205.5 33679 -1.3 -108.9 32452 0.0000 496 153 Thu 14Feb91 08:00:00 47.5 209.3 32418 -2.8 -111.8 30998 0.0000 496 166 Thu 14Feb91 08:30:00 44.1 211.8 30533 -4.4 -114.3 28900 0.0000 496 179 Thu 14Feb91 09:00:00 40.6 212.8 27956 -6.2 -116.0 26099 0.0000 496 192 Thu 14Feb91 09:30:00 37.0 211.8 24582 -8.4 -116.4 22501 0.0000 496 205 Thu 14Feb91 10:00:00 33.0 207.4 20262 -11.0 -114.3 17963 0.0000 496 218 Thu 14Feb91 10:30:00 27.2 195.8 14828 -14.4 -106.6 12263 0.0000 496 231 Thu 14Feb91 11:00:00 7.6 162.3 8840 -18.2 -81.2 5202 0.0000 496 244 ------ From the First Space Science Department in the World: : _^ ^_ ____ Patricia H. Reiff : / O O \ |GO \ Department of Space Physics and Astronomy : \ V / |OWLS\ Rice University, Houston, TX 77251-1892 : / ""R"" \__/ internet: reiff@spacvax.rice.edu (128.42.10.3) \ ""U"" / SPAN: RICE::REIFF : _/|\ /|\_ "Why does man want to go to the Moon? ... Why does Rice play Texas?" ....JFK, Rice Stadium, 1962 ------------------------------ Date: 11 Feb 91 16:58:54 GMT From: van-bc!ubc-cs!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@ucbvax.Berkeley.EDU (Ron Baalke) Subject: Galileo Update - 02/11/91 GALILEO STATUS REPORT February 11, 1991 The Galileo spacecraft's health continues to be excellent. Yesterday, Galileo successfully performed the planned sun acquisition activity. Today, no spacecraft activity is planned. Tomorrow, a USO (Ultra Stable Oscillator) test and a sun acquisition are planned. ___ _____ ___ /_ /| /____/ \ /_ /| Ron Baalke | baalke@mars.jpl.nasa.gov | | | | __ \ /| | | | Jet Propulsion Lab | ___| | | | |__) |/ | | |___ M/S 301-355 | It's 10PM, do you know /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | where your spacecraft is? |_____|/ |_|/ |_____|/ | We do! ------------------------------ Date: 11 Feb 91 20:46:53 GMT From: magnus.ircc.ohio-state.edu!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!samsung!know!tegra!vail@tut.cis.ohio-state.edu (Johnathan Vail) Subject: Re: Kevlar (was: Manoeuvring using rope and anchor) In article <6117@idunno.Princeton.EDU> marty@puppsr.Princeton.EDU (Marty Ryba) writes: In article <4728@mindlink.UUCP>, Bruce_Dunn@mindlink.UUCP (Bruce Dunn) writes: |> Kevlar is fascinating stuff. I just acquired a spool of Kevlar fiber for |> tinkering purposes. It looks like pale yellow dental floss, or like polyester |> sewing thread. The spool that I have is loaded with a strand that has two |> individual thread-like fiber bundles twisted around each other. The thread is Kevlar is fascinating stuff. It doesn't have to be yellow; I've seen it white too. |> The Kevlar I bought was obtained from the Canadian distributor for Edmond |> Scientific. In the Edmond catalog, the item is catalog number G34,883. |> Price is $13.50 U.S. for a 600 yard spool. Though the price doesn't sound too bad, for convenience and maybe a better price, plus for stuff that is really optimized for tensile strength with high flexibility and minimal abrasiveness (needed for making cables that last), go to any good archery shop. There are several brands of Kevlar on the market; one was called "Super Flight" or something like that was twice as strong per weight than standard Kevlar, and lasted longer since one needed fewer strands per cable and it was less abrasive. Remember, the lighter the string, the faster the arrow will go. Archery involves some high-tech materials science and physics besides being plain fun. Should this thread go somewhere else? Anyway, kite shops sell "300 pound" kevlar string. It is yellowy, braided I think, and quite strong. Just the thing for flying a couple of 10' stunters in a hurricane... jv Law of Stolen Flight: Only flame, and things with wings. All the rest suffer stings. _____ | | Johnathan Vail | n1dxg@tegra.com |Tegra| (508) 663-7435 | N1DXG@448.625-(WorldNet) ----- jv@n1dxg.ampr.org {...sun!sunne ..uunet}!tegra!vail ------------------------------ Date: 6 Feb 91 23:57:44 GMT From: pacbell.com!pacbell!barn!everexn!mike@ucsd.edu (Mike Higgins) Subject: O(n) n-body simulation? Feng Zaho? Several times in the last 6 months, somebody named cristy@dupont.com has posted messages in sci.physics about: "Feng Zaho's O(n) n-body simulation" I have sent email to this person several times after each posting, but he/she never answers... One time the poster asked if anybody else was attempting to implement this algorithm... I for one sure wish I was someone attempting to implement it, but I cannot find a reference to it! Since cristy will not answer my email, perhaps someone else out here in netland knows what this is and can give me a reference to it. Or if you know who cristy@dupont.com is and can ask them to get in touch with me (mike@everexn.com) I would appreciate it very much. Mike Higgins mike@everexn.com ------------------------------ Date: 8 Feb 91 16:38:30 GMT From: sdd.hp.com!usc!hacgate!ashtate!dbase!michaelw@ucsd.edu (Michael Wallis) Subject: Re: Confusion regarding "Firm Fred Decisions" What a shame ... for a COST of $6 Billion, we could build a much larger and stronger station based on orbital use of ETs. When will NASA learn that they don't have to re-invent the wheel every time they do someting in space? ------------------------------ Date: 11 Feb 91 16:16:22 GMT From: ogicse!emory!athena.cs.uga.edu!millians@decwrl.dec.com (David W. Millians) Subject: COPUOS I've been following discussion for a while, so I know this hasn't poppped up: Does anybody know the status of the UN committee on the peaceful uses of outer space? Reason for asking: I'm going to chair said topic at an upcoming Model UN, and I've got to get a book together. I'm well versed in the subjects of space (Dad worked on Gemini and Apollo, and I grew up on missile bases) but I need a kickstart about where to start finding COPUOS information. I hope this doesn't offend anybody (it's causing much disc. in other groups) but I would appreciate E-mail respoinses, and I will summarize to the group. I read this every day, but I can't imagine too much interest in the subject for other patrons of the group. Additionally, when I've got my guide together, I'll summarize MY info about where to get information. Thanks in advance, o'course. I appreciate it. -- David W. Millians millians@athena.cs.uga.edu University of Georgia, Athens GA USA. "What exactly is UNIX, Mr. IFF?" "It is a P2C2E, thief Haroun, on a M2C2D." (Apologies to Salman Rushdie) I guess all opinions are mine and only mine. ------------------------------ Date: 11 Feb 91 18:29:24 GMT From: eplrx7!cristy@louie.udel.edu (John Cristy) Subject: Re: O(n) n-body simulation? Feng Zaho? See An O(N) Algorithm for Three-dimensional N-body Simulations, MSEE thesis, Feng Zhao, MIT AILab Technical Report 995, 1987 cristy@dupont.com -- The UUCP Mailer ------------------------------ Date: 7 Feb 91 05:44:00 GMT From: swrinde!elroy.jpl.nasa.gov!zardoz.cpd.com!dhw68k!ofa123!f2700.n206.z1.fidonet.org!William.Wright@ucsd.edu (William Wright) Subject: Mir sweepstakes I'm sorry to report that a District Attorney in Texas (I'm not sure whether it was a county, or the state itself) has arrested the two organizers of the Mir sweepstakes. The charge is "felony". This means 2-10 yrs in prison + a maximum fine of $10,000. Reportedly, the authorities consider toe sweepstakes to be gambling, pure and simple. Evidently accepting "free" entries via mail was not enough to satisfy the authorities. Reportedly, the authorities offered to drop the charges if Space Travel Services would refund the entries to date, but Space Travel Services refused. -- William Wright Internet: William.Wright@f2700.n206.z1.fidonet.org Compuserve: >internet:William.Wright@f2700.n206.z1.fidonet.org -------------------------------------------------------------------------- ------------------------------ Date: 5 Feb 91 13:40:27 GMT From: mcsun!unido!mpirbn!p515dfi@uunet.uu.net (Daniel Fischer) Subject: When will there be 'TAU'? (was Re: The edge of the solar system) In article <9102040110.AA17921@cmr.ncsl.nist.gov> roberts@CMR.NCSL.NIST.GOV (John Roberts) writes: >>I have seen several articles about a planned NASA mission: the TAU probe >>(TAU stands for Thousand Astronomical Units). A very high tech device, ... >>Paul Blase - via FidoNet node 1:129/104 >Sounds interesting. It would be powered by a nuclear reactor, of course. And that's exactly the reason why TAU won't become reality until at least well into the 21st century. During a NASA press conference in Aug 1989 JPL director Lew Allen was asked about what had become of 'TAU', and he replied that the idea was still somewhere in the files, but that one would first have to wait for a suitable space reactor (I think he mentioned the SP-100 type). Question: would Topaz-2, which the U.S. is buying from the USSR, help here? ------------------------------ End of SPACE Digest V13 #147 *******************