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 ; Sat, 16 Feb 91 01:59:56 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Sat, 16 Feb 91 01:59:51 -0500 (EST) Subject: SPACE Digest V13 #158 SPACE Digest Volume 13 : Issue 158 Today's Topics: Re: SPACE Digest V13 #102 Re: Controversy Ulysses Update - 02/05/91 Re: Solar Impact Mission. Re: Ulysses Update - 02/12/91 Re: O(n) n-body simulation? Feng Zaho? Ulysses Update - 02/12/91 Mars NASA Headline News for 02/05/91 (Forwarded) 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 ---------------------------------------------------------------------- Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: Tue, 12 Feb 91 18:20:21 EST From: Tommy Mac <18084TM%MSU.BITNET@BITNET.CC.CMU.EDU> Subject: Re: SPACE Digest V13 #102 In-Reply-To: Message of Sat, 2 Feb 91 03:38:01 EST from To: space+@ANDREW.CMU.EDU I read that thing on the moon. It reminded me of an interesting idea I heard. Perhaps the proof of God is our moon. Consider: The only binary planet in our system is Earth/moon The only terrestrial with a moon is Earth The moon appears the same size (or nearly so) giving incredible eclipses -which make possible solar corona observations The moon made agriculture possible (planting periods) The moon was the first calendar (month) The moon inspired Newton's idea's for gravitation The moon will make extended settlement of space possible Maybe God is a far-fetched conclusion to reach, despite the coincidences. But what other developments is the moon responsible for? Tommy Mac -If God wanted us to travel in space... he wold have given us a large moon made of metal oxides. Acknowledge-To: <18084TM@MSU> ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 13 Feb 91 00:58:51 GMT From: sdd.hp.com!uakari.primate.wisc.edu!samsung!umich!dgsi!gregc@ucsd.edu (Greg Cronau) Organization: Cimage Corp, Ann Arbor, MI Subject: Re: Controversy References: <1991Feb9.064442.6737@ee.ualberta.ca>, <6116@idunno.Princeton.EDU> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In article <6116@idunno.Princeton.EDU> marty@pulsar.princeton.edu writes: >In article <1991Feb9.064442.6737@ee.ualberta.ca>, tanaka@ee.ualberta.ca (Craig Tanaka) writes: >|> A friend and I are having an argument over the pictures of the first steps >|> upon the Moon. I was wondering if someone could clarify whether or not >|> it was taken by a remote camera or was restaged afterwards. (the video of >|> Armstrong jumping off the ladder on the descent module down to the surface.) >|> I am sure that questions such as this have been asked many times, and for >|> that I apologize, but if someone could help me out, I would be very >|> grateful. > >Simple answer: the shot of an astronaut climbing down from the ladder as >seen from about 30' from the lander was taken by Neil Armstrong and showed >Buzz Aldrin stepping out. The 'one small step' video is the (less seen) >shot from the lander hatch that mostly shows Armstrong's head. >Since the later video is more photogenic, it is more often used and often >has Armstrong's words juxtaposed on it, leading to the confusion. > >-- >Marty Ryba | slave physics grad student >Princeton University | They don't care if I exist, >Pulsars Unlimited | let alone what my opinions are! >marty@pulsar.princeton.edu | Asbestos gloves always on when reading mail Huh? Are you talking about some motion picture film that was shot from the astronauts hand-held cameras and then developed later on Earth? I'm thinking of the black and white, very low-fidelity, real-time video that was broadcast from the LEM as Armstrong descended the ladder for the first time. It was shot from a B/W tv camera in an equipment bay on the side of the LEM. gregc@cimage.com ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 5 Feb 91 18:00:44 GMT From: att!linac!uwm.edu!caen!sdd.hp.com!elroy.jpl.nasa.gov!jato!mars.jpl.nasa.gov!baalke@ucbvax.Berkeley.EDU (Ron Baalke) Organization: Jet Propulsion Laboratory, Pasadena, CA. Subject: Ulysses Update - 02/05/91 Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu ULYSSES STATUS REPORT February 5, 1991 The Ulysses spacecraft is not responding to commands transmitted over the 34 meter antenna in Madrid yesterday. The station performed a manual tune last night with 18 kw transmitter output. The Project then transmitted commands to the Low Gain Antenna on the spacecraft. The commands are hitting the spacecraft, but the CDU (Command Decoder Unit) is not executing. The station then swapped from CPA-2 (Command Processor Assembly - 2) to CPA-4 and commands were again sent, but there is still no executing by the spacecraft. The 34 meter antenna at Goldstone also provided support last night, but again there is still no command execution by the spacecraft. The Project will make a formal annoucement later today. ___ _____ ___ /_ /| /____/ \ /_ /| 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! ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 5 Feb 91 21:50:55 GMT From: att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!news-server.csri.toronto.edu!utzoo!henry@ucbvax.Berkeley.EDU (Henry Spencer) Organization: U of Toronto Zoology Subject: Re: Solar Impact Mission. References: <1991Feb4.172846.3706@zoo.toronto.edu>, <1991Feb5.154205.29266@engin.umich.edu>, <1991Feb5.185021.10001@lonex.radc.af.mil> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In article <1991Feb5.185021.10001@lonex.radc.af.mil> disprep@lonex.radc.af.mil (Disaster Preparedness) writes: > These are very interesting ideas that, I agree, would allow a probe >to change its direction in a hurry. The problem I see is that when the >vehicle enters an atmosphere, it loses kinetic energy in favor of thermal >energy. The idea of using this aero-assist method would seem to work okay >for a solar impact mission, but I don't see how a probe could reach Pluto >in four years after losing kinetic energy... You lose some energy to air drag in the waverider concept. However, you are doing a turn around a *moving* planet, and there is momentum transfer from planet to probe (or vice versa), just like with a gravity-assist maneuver. >... Does it kind of bounce off >of the Martian atmosphere and gain a whole bunch of kinetic energy somehow... Viewed from a distance, either a gravity-assist maneuver or a waverider turn looks very much like bouncing off the planet. Remember, the planet is moving, so bouncing off it can give you a velocity gain or loss, depending on which direction you come in from and the angle of the bounce. The waverider's advantage is that it can give you a much more drastic bounce, because the aerodynamic forces are much stronger than gravity. -- "Maybe we should tell the truth?" | Henry Spencer at U of Toronto Zoology "Surely we aren't that desperate yet." | henry@zoo.toronto.edu utzoo!henry ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 14 Feb 91 15:02:26 GMT From: elroy.jpl.nasa.gov!jato!mars!baalke@decwrl.dec.com (Ron Baalke) Organization: Jet Propulsion Laboratory, Pasadena, CA. Subject: Re: Ulysses Update - 02/12/91 References: <1991Feb13.000036.10785@jato.jpl.nasa.gov>, <1991Feb14.060346.12296@cimage.com> Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu In article <1991Feb14.060346.12296@cimage.com> gregc@dgsi.UUCP (Greg Cronau/10000) writes: >In article <1991Feb13.000036.10785@jato.jpl.nasa.gov> baalke@mars.jpl.nasa.gov (Ron Baalke) writes: >> >> ULYSSES STATUS REPORT >> February 12, 1991 >> >> A Doppler off-set of 1.6 hz. was introduced making >>the new radiated uplink frequency 16001.6 hz. >> > >Are you really transmitting commands to the spacecraft at that *low* of a >frequency? 16000Hz? Are you sure that isn't 16000 Mhz? Just curious. > 16000 Hz is the correct value. None of the deep space spacecraft use a uplink frequency over 1 Mhz. ___ _____ ___ /_ /| /____/ \ /_ /| 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. ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 11 Feb 91 13:07:04 GMT From: cs.yale.edu!starr-page@CS.YALE.EDU (Page Starr) Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158 Subject: Re: O(n) n-body simulation? Feng Zaho? Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu The following paper describes O(n) algorithms for n-body simulations: L. Greengard and V. Rokhlin, "A fast algorithm for particle simulations," Journal of Computational Physics, 73:325-348, 1987. There are several implementations floating around. ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 13 Feb 91 00:00:36 GMT From: usc!elroy.jpl.nasa.gov!mahendo!jato!mars.jpl.nasa.gov!baalke@ucsd.edu (Ron Baalke) Organization: Jet Propulsion Laboratory, Pasadena, CA. Subject: Ulysses Update - 02/12/91 Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu ULYSSES STATUS REPORT February 12, 1991 The following orbital data was taken on the Ulysses spacecraft as of 9AM (PST), February 11, 1991: Distance from Earth 115,207,284 miles (185,408,151 km) Distance from Jupiter 310,061,044 miles (498,994,881 km) Velocity relative to the Sun 61,985 mph (99,756 kph) Velocity relative to the Earth 73,783 mph (118,742 kph) Tape recorder operations based on recovering data acquired during the 16 hours out of view periods are continuing on a routine scheduled basis. Experiment reconfigurations have been carried out as required. An average of 97% data recovery was achieved during the past week. On February 4, analysis and testing continued to resolve the commanding problem which had first appeared on February 1. The problem had worsened and it was no longer possible to obtain command acceptance on either decoder. Many combinations of on-board systems were selected but there was no success. On February 5, the investigation continued. In order to make the 70 meter antenna site available for further testing, a spacecraft emergency was declared which released it from its scheduled support. Following the declaration a suggestion was received from a JPL telecommunications expert that it may be necessary to apply a Doppler correction to the command sub-carrier uplink frequency due to the current velocity of the spacecraft relative to the Earth (69,108 mph on February 4). A Doppler off-set of 1.6 hz. was introduced making the new radiated uplink frequency 16001.6 hz. The command sequences scheduled for this day were then transmitted. The command sequences were successful with the exception of one block which was rejected on board due to 2 missing frames. However, the daily tape recorder operations commands were successful and no data loss occurred as a result of command problems. On February 6, normal daily commanding yielded a 5% rejection rate and caused several commands to be re-transmitted. Since command acceptance had up to this point not been a problem it was felt that optimization of the sub-carrier frequency was required and the actual frequency was therefore varied in steps of 0.4 hz. to try and establish a pattern of success rate against frequency. This testing is very time-consuming due primarily to the two way light time which is currently in the order of 20 minutes. The investigation is continuing in parallel with the daily transmission of mission related commands. The effect on the mission is to significantly increase overall uplink times due to the need to re-transmit commands frequently. During the playback of on-board data on February 6, bad quality data were experienced at the Madrid ground station causing several hours of the data to be lost. The problem was believed to have been in the ground station. There has been no reoccurance of this problem since this date. The spacecraft is currently configured with receiver 2 as the prime unit fed via the High Gain Antenna and with receiver 1 as backup fed through the Low Gain Antenna (LGA-F). Received downlink level is at -124 dbm (34 meter) X-band. Variations of up to 20 db. can be expected as a result of station in use, local weather conditions, and spacecraft antenna off-pointing. Received uplink level is at -110 dbm. A close watch is being kept for the possible return of nutation and procedures are available to control it should it occur. No detectable nutation has been observed during the past week. ___ _____ ___ /_ /| /____/ \ /_ /| 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. ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 9 Feb 91 09:57:00 GMT From: usc!elroy.jpl.nasa.gov!zardoz.cpd.com!dhw68k!ofa123!f4.n104.z1.fidonet.org!Michael.Corbin@ucsd.edu (Michael Corbin) Organization: FidoNet node 1:104/4 Subject: Mars Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu I would like any information anyone might have regarding the recent Soviet satellite failure which occurred during the probes of the Martian moons? Thanks, Mike -- Michael Corbin Internet: Michael.Corbin@f4.n104.z1.fidonet.org Compuserve: >internet:Michael.Corbin@f4.n104.z1.fidonet.org -------------------------------------------------------------------------- ------------------------------ Return-path: X-Andrew-Authenticated-as: 0;andrew.cmu.edu;Network-Mail Date: 5 Feb 91 18:57:33 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Organization: NASA Ames Research Center, Moffett Field, CA Subject: NASA Headline News for 02/05/91 (Forwarded) Sender: space-request@andrew.cmu.edu To: space@andrew.cmu.edu Headline News Internal Communications Branch (P-2) NASA Tuesday, February 5, 1991 Audio Service: 202 / 755-1788 This is NASA Headline News for Tuesday, February 5, 1991 Technicians working on Discovery continue to make good progress in preparing that vehicle for roll over to the Vehicle Assembly Building. That rollover is now expected to be no earlier than late Friday, Feb. 8, and possibly early Saturday, Feb. 9. Inspection of the thruster heater, which had failed in an earlier check, showed an open circuit in one of the control wires. That is being spliced now, and will be tested later today. Weight and center-of-gravity measurements are expected to be taken later this week. Atlantis' flow is also continuing on schedule. Workers installed the right orbital maneuvering system pod over the weekend. Tests of that pod should begin tomorrow. Technicians are still preparing the orbiter cabin for installation of windows #1 and #6. Activity today includes work on the window frames. The external tank was mated to Atlantis' STS-37 solid rocket booster stack yesterday. Field joint closeouts and inspections on both SRBs were also completed. * * * * * * * * * * * * * * * * * * * * * * * * * * NASA yesterday issued its February 1991 Mixed Fleet Manifest for Space Shuttle and expendable launch vehicle planned flights. Nearly 70 percent of the 26 shuttle flights planned for the next 3 years are for NASA payloads or joint NASAJ/Jinternational payloads. Seven shuttle flights are planned this year, eight in 1992 and eleven in 1993. * * * * * * * * * * * * * * * * * * * * * * * * * * NASA yesterday released its 1992 Fiscal Year budget request. The request seeks $15,754 billion, with 46 percent going for research and development activities and another 35 percent allocated for space flight operations. The FY 1992 request represents a 13.6 percent increase over the current year's appropriation. The request includes two significant new initiatives: a New Launch System to be jointly developed with the Department of Defense; and Lifesat, a multi-launch recoverable biosatellite system. The new budget request also includes funding for construction of an Earth Observing System Data Facility at Goddard and construction of the Space Station Processing Facility at Kennedy. NASA's FY 1992 request represents only one percent of the total Federal Budget. * * * * * * * * * * * * * * * * * * * * * * * * * * This is Black History Month, and as part of its observation, NASA has scheduled four special events to be held in the Headquarters auditorium. Tomorrow, at 11:00 am, NASA will present Dr. Edward Fort, Chancellor of North Carolina A&T State University, Greensboro. Dr. Fort will address the theme of this year's Black History observation and comment on "Historically Black Colleges and Universities." The presentation will be shown live on NASA Select TV. Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are Eastern. **indicates a live program. Tuesday, 2/5/91 12:00 pm NASA Video Productions will be transmitted. 6:00 pm NASA Video Productions repeats. Wednesday, 2/6/91 11:00 am **"Historically Black Colleges and Universities," presentation by Dr. Edward Fort, Chancellor of North Carolina A&T State University. 1:15 pm **Magellan-at-Venus update from Jet Propulsion Laboratory. All events and times may change without notice. This report is filed daily, Monday through Friday, at 12:00 pm, EST. It is a service of Internal Communications Branch at NASA Headquarters. Contact: 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. ------------------------------ End of SPACE Digest V13 #158 *******************