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Mars Global Surveyor : It's Dead, Jim.
Brian Gaff wrote: Not heard the latest myself, but I'd not have thought a dodgy panel motor was too much of a problem. I seem to recall that there were problems with the arrays at the very start though. Brian Gene: I do wish there were a website where more recent information could be found. After all, on Wed of this week, there was to be an attempt to spot MGS and if that worked, on Friday a more accurate image was to be attempted. Did either of these work? I have no idea because the MRO website has no info and the MGS site has no info either. No info on sci.space.news and no real update here either. :-( Anyone have an actual link to an official statement? |
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Mars Global Surveyor : It's Dead, Jim.
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Mars Global Surveyor : It's Dead, Jim.
Brian Gaff wrote: Not heard the latest myself, but I'd not have thought a dodgy panel motor was too much of a problem. I seem to recall that there were problems with the arrays at the very start though. Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ "Thomas Lee Elifritz" wrote in message ... Get over it. http://cosmic.lifeform.org I think the article from nasa on Tuesday, can be correlated with the paper located at the site below, would give a high probability indication that after a long successful mission the MGS damaged solar panel eventually failed causing the recent communications failure. http://www.nasa.gov/mission_pages/mgs/mgs-20061121.html Update, Nov. 21, 7 p.m. EST (4 p.m. PST): NASA's Mars Exploration Rover Opportunity did not detect any signal from Mars Global Surveyor on Tuesday during an attempt to get the orbiter to transmit to the rover. The commands will be repeated Wednesday. ..Pasadena, Calif. - NASA's Mars Global Surveyor has likely finished its operating career. The orbiter has not communicated with Earth since Nov. 2. ...Preliminary indications are that a solar panel became difficult to pivot, raising the possibility that the spacecraft may no longer be able to generate enough power to communicate. Engineers are also exploring other possible explanations for the radio silence." http://mars.jpl.nasa.gov/mgs/sci/aerobrake/SFMech.html "AAS 98-112 MARS GLOBAL SURVEYOR AEROBRAKING AT MARS M. D. Johnston, P. B. Esposito, V. Alwar, S. W. Demcak*, E. J. Graat, R. A. Mase "On September 12, 1997, the Mars Global Surveyor (MGS) spacecraft was successfully inserted into a highly elliptical capture orbit about Mars. To establish the required mapping orbit, the MGS spacecraft must supplement its propulsive capabilities by aerobraking. This paper describes the aerobraking strategy developed for the MGS mission. This description includes the aerobraking constraints imposed on the trajectory design, the approach toward aerobraking trajectory control, and the aerobraking flight profile that resulted from the planning activities that occurred after launch. The initial aerobraking results are contrasted to the planned baseline trajectory. Additionally, this paper describes the aerobraking progress of the MGS spacecraft made following a three week aerobraking hiatus that occurred in October 1997. This hiatus was initiated in order to provide time to evaluate the viability of continuing aerobraking with newly discovered damage to one of the two spacecraft's solar arrays. The results of the stand-down forced a major re-evaluation of the MGS mission and this paper briefly describes the new mission outlook. INTRODUCTION This paper describes the aerobraking strategy developed for the MGS mission. This description includes the aerobraking constraints imposed on the trajectory design, the approach toward aerobraking trajectory control, and the aerobraking flight profile that resulted from the planning activities that occurred after launch. The initial aerobraking results are contrasted to the planned baseline trajectory. Additionally, this paper describes the aerobraking progress the MGS spacecraft made following a three week aerobraking stand-down that occurred in October 1997. This hiatus was initiated in order to provide time to evaluate the viability of continuing aerobraking with newly discovered damage to one of the two spacecraft's solar arrays. The previously undetected damage was attributed to a failure that occurred during the original solar array deployment sequence at launch. The review concluded that it was safe to resume aerobraking albeit at much lower levels of dynamic pressure. The results of the stand-down forced a major re-evaluation of the MGS mission and this paper briefly describes the new mission outlook." Open sharing of information is crucial to improving everybody's understanding of the universe around us. Tom |
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