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 ; Thu, 12 Apr 90 02:52:51 -0400 (EDT) Message-ID: <8a92KGm00VcJMMLU48@andrew.cmu.edu> Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Thu, 12 Apr 90 02:52:04 -0400 (EDT) Subject: SPACE Digest V11 #253 SPACE Digest Volume 11 : Issue 253 Today's Topics: Re: Galileo Update - 04/10/90 Re: National Space Society NASA Headline News for 04/11/90 (Forwarded) Re: Launch of 7th Block II GPS Satellite NASA Headline News for 04/10/90 [Afternoon] (Forwarded) ---------------------------------------------------------------------- Date: 11 Apr 90 16:27:21 GMT From: zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!jato!news@tut.cis.ohio-state.edu (news) Subject: Re: Galileo Update - 04/10/90 >baalke@mars.jpl.nasa.gov (Ron Baalke) writes: >>The maneuver, which will slow the spacecraft by 24.8 meters per >>second or about 55 mph, will be carried out in four daily >>portions, each lasting more than 6 1/2 hours. The spinning >>spacecraft will deliver tiny pulses from its lateral thrusters >>each time one of them is pointed in the right direction. In the >>four days, this comes to almost 6400 pulses. >This seems like a rather large maneuver. Was it planned beforehand because >we didn't have a choice on this particular path, or did they suddenly >realize that they missed something and are now correcting for somebody's >big faux-pas? No, this is just a normal routine course maneuver. Prior to the Galileo's launch, it was discovered that the thrusters aboard the spacecraft had the potential of blowing up if the thrusters were turned on for too long of a period. So, the thrusters are turned on in small pulses over a period of days instead of one long burn. From: baalke@mars.jpl.nasa.gov (Ron Baalke) Path: mars!baalke Ron Baalke | baalke@mars.jpl.nasa.gov Jet Propulsion Lab M/S 301-355 | baalke@jems.jpl.nasa.gov 4800 Oak Grove Dr. | Pasadena, CA 91109 | ------------------------------ Date: 11 Apr 90 17:51:08 GMT From: fernwood!portal!cup.portal.com!hkhenson@apple.com (H Keith Henson) Subject: Re: National Space Society After reading the posted survey/membership recrutement form from NSS, *I* wouldn't join it. Keith Henson ------------------------------ Date: 12 Apr 90 01:02:33 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 04/11/90 (Forwarded) ----------------------------------------------------------------- Wednesday, April 11, 1990 Audio Service: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Wednesday, April 11..... Kennedy Space Center engineers are preparing to replace an auxiliary power unit controling the space shuttle "power steering" and the pressure valves regulating the three hydrogen- oxygen fueled main engines. Mission managers stopped the countdown upon concern with erratic readings of a hydraulic valve. Changeout will take at least one week and two weeks at the most. A new launch date will be determined tomorrow. Ground crews are scheduled around the clock. At this time, the external tank has been drained of propellants. Removal of the cryogenic reactants from the fuel cells in the storage tanks located beneath the payload bay is now underway. The rotating structure will be moved away from the Discovery to provide access to the payload. However, work may be slowed due to rain at launch pad 39B. Although little risk is involved, a test team is keeping in mind how long it will actually take to replace the faulty power unit with the possibility of contamination of the Hubble Space Telescope. They are deciding to either remove the batteries for recharging outside the orbiter or to connect cables while still in place. * * * An orbiter Atlantis fuel cell accident inquiry board will provide a final report by April 30. Aerospace Daily reports a post- flight test revealed a problem. As a result, it was scheduled to be returned to the manufacturer, United Technologies Corporation. The cell was damaged before removal last April 4. * * * The Galileo spacecraft is traveling at more than 78,000 miles per hour. It is setting a pace which will now begin to slow down the spacecraft by just 55 miles per hour --changing the speed by only one fifteenth of one percent. The process involves a series of tiny pulses that maneuvers the Galileo to a flight path for the Earth gravity assist in December. * * * Launch activities scheduled at Cape Canaveral Air Force Station have been delayed due to the launch scrub of the Space Shuttle Discovery. McDonnell Douglas Space Systems yesterday delayed launch of the Palapa B2-R telecommunications satellite by one day to April 13. It is now scheduled for 6:28 p.m. EDT on a Delta II booster. *********** ----------------------------------------------------------------- Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are Eastern. Thursday, April 12...... 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 Noon, EDT. ----------------------------------------------------------------- A service of the Internal Communications Branch, NASA HQ. ------------------------------ Date: Wed, 11 Apr 90 10:19:35 ADT From: LANG%UNB.CA@vma.cc.cmu.edu Subject: Re: Launch of 7th Block II GPS Satellite On 10 Apr 90 01:44:45 GMT zaphod.mps.ohio-state.edu!mips!daver!lynx!neal@think.com writes: > > In article LANG@UNB.CA writes: > >>7th Block II Global Positioning System Satellite Launched >>................................the satellite does appear to >>be in the B-plane. > > What exactly do you mean "in the B-plane"? Does this have something > to do with the various orbits that the GPS satellites travel in? The GPS satellites are being placed into 6 orbital planes with 3 or 4 satellites in each plane. The planes are equally spaced in right ascension; i.e., they are 60 degrees apart. Here is a summary of the status of both the Block I and Block II satellites (7th Block II not added yet). Navstar GPS Constellation Status Blk NASA Orbit II PRN Internat. Catalog Plane Launch Seq SVN Code ID Number Pos'n Date Status (90-03-05) -------------------------------------------------------------------------------- Block I 1 4 1978-020A 10684 (C-4) 78-02-22 Not usable since 85-07 2 7 1978-047A 10893 (A-4) 78-05-13 Not usable since 85-09 3 6 1978-093A 11054 A-3 78-10-06 Operating on Rb clock 4 8 1978-112A 11141 (C-3) 78-12-10 L-band signals turned off 89-10-14 5 5 1980-011A 11690 (C-1) 80-02-09 Not usable since 84-05 6 9 1980-032A 11783 A-2 80-04-26 Operating on 2nd Rb clock 7 81-12-18 Launch failure 8 11 1983-072A 14189 C-2 83-07-14 Operating on Cs clock 9 13 1984-059A 15039 C-1 84-06-13 Operating on Cs clock 10 12 1984-097A 15271 A-1 84-09-08 Operating on Cs clock 11 3 1985-093A 16129 D-1 85-10-09 Actually near position C-9; operating on Rb clock without temp. control Block II II-1 14 14 1989-013A 19802 E 89-02-14 Operating on Cs clock II-2 13 2 1989-044A 20061 B 89-06-10 Operating on Cs clock II-3 16 16 1989-064A 20185 E 89-08-18 Became available 89-10-14 II-4 19 19 1989-085A 20302 A 89-10-21 Became available 89-11-23 II-5 17 17 1989-097A 20361 D 89-12-11 L-band signals enabled 90-01-06 II-6 18 18 1990-008A 20452 F 90-01-24 Became available 90-02-14 22:26 UT; testing underway Notes 1. NASA Catalog Number is also known as NORAD or U.S. Space Command object number. 2. Bracketed orbital plane position = satellite no longer operational. ======================================================================== Richard B. Langley BITnet: LANG@UNB.CA or SE@UNB.CA Geodetic Research Laboratory Phone: (506) 453-5142 Dept. of Surveying Engineering Telex: 014-46202 University of New Brunswick FAX: (506) 453-4943 Fredericton, N.B., Canada E3B 5A3 ======================================================================== ------------------------------ Date: 12 Apr 90 01:00:49 GMT From: trident.arc.nasa.gov!yee@ames.arc.nasa.gov (Peter E. Yee) Subject: NASA Headline News for 04/10/90 [Afternoon] (Forwarded) ----------------------------------------------------------------- NASA Headline News, April 10 -- 3:00 P.M. Audio: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Tuesday, April 10.... The launch of the space shuttle Discovery with its Hubble Space Telescope payload has been delayed for a week to two weeks. NASA officials say they will reassess the delay in a couple of days. At four minutes before launch this morning, a problem was detected in an auxiliary power unit...or APU...aboard Discovery. The unit is one of three necessary to power the hydraulics aboard the orbiter. All three APUs are required for launch. There are two concerns now facing mission officials. The APU must be removed and replaced with another unit and must be thoroughly checked out before a launch attempt. The other concern is charging of the batteries aboard the telescope. They must be charged to a certain level before the mission can proceed. Work crews will drain the liquid propellants from the external tank and make the pad ready for work crews. No additional news briefings are scheduled today. * * The Jet Propulsion Lab reports the Galileo spacecraft is operating well. This week controllers will watch as the spacecraft makes a series of trajectory corrections necessary for its gravity-assist flyby of Earth in December. The maneuvers will slow Galileo down by about 55 miles per hour. It will take four small corrections, each lasting about six and 1/2 hours, to accomplish. The firt correction was done Monday. Galileo is traveling at a velocity of 78,000 miles per hour, relative to the Sun. It's 83-million miles from Earth. * * Two NASA centers will have new directors July 1. John Klineberg moves from his post as director of Lewis Research Center to become director of Goddard Space Flight Center. Klineberg's deputy...Lawrence Ross...will become Lewis' director. John Townsend will retire as director of Goddard June 30. ********************* ----------------------------------------------------------------- Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are eastern. Thursday, April 12...... ----------------------------------------------------------------- Wednesday, April 11, 1990 Audio Service: 202/755-1788 ----------------------------------------------------------------- This is NASA Headline News for Wednesday, April 11..... Kennedy Space Center engineers are preparing to replace an auxiliary power unit controling the space shuttle "power steering" and the pressure valves regulating the three hydrogen- oxygen fueled main engines. Mission managers stopped the countdown upon concern with erratic readings of a hydraulic valve. Changeout will take at least one week and two weeks at the most. A new launch date will be determined tomorrow. Ground crews are scheduled around the clock. At this time, the external tank has been drained of propellants. Removal of the cryogenic reactants from the fuel cells in the storage tanks located beneath the payload bay is now underway. The rotating structure will be moved away from the Discovery to provide access to the payload. However, work may be slowed due to rain at launch pad 39B. Although little risk is involved, a test team is keeping in mind how long it will actually take to replace the faulty power unit with the possibility of contamination of the Hubble Space Telescope. They are deciding to either remove the batteries for recharging outside the orbiter or to connect cables while still in place. * * * An orbiter Atlantis fuel cell accident inquiry board will provide a final report by April 30. Aerospace Daily reports a post- flight test revealed a problem. As a result, it was scheduled to be returned to the manufacturer, United Technologies Corporation. The cell was damaged before removal last April 4. * * * The Galileo spacecraft is traveling at more than 78,000 miles per hour. It is setting a pace which will now begin to slow down the spacecraft by just 55 miles per hour --changing the speed by only one fifteenth of one percent. The process involves a series of tiny pulses that maneuvers the Galileo to a flight path for the Earth gravity assist in December. * * * Launch activities scheduled at Cape Canaveral Air Force Station have been delayed due to the launch scrub of the Space Shuttle Discovery. McDonnell Douglas Space Systems yesterday delayed launch of the Palapa B2-R telecommunications satellite by one day to April 13. It is now scheduled for 6:28 p.m. EDT on a Delta II booster. *********** ----------------------------------------------------------------- Here's the broadcast schedule for Public Affairs events on NASA Select TV. All times are Eastern. Thursday, April 12...... 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 Noon, EDT. ----------------------------------------------------------------- A service of the Internal Communications Branch, NASA HQ. ------------------------------ End of SPACE Digest V11 #253 *******************