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Planetary Society Blog for Saturday 30 May 2015
Planetary Society Blog
/////////////////////////////////////////// For LightSail Test Mission, Waiting is the Hardest Part Posted: 29 May 2015 02:02 PM PDT http://www.planetary.org/blogs/jason...dest-part.html The Planetary Society's LightSail spacecraft is now entering its second week of silence. /////////////////////////////////////////// Dawn Journal: Spiralling Closer to Ceres Posted: 29 May 2015 05:32 AM PDT http://www.planetary.org/blogs/guest...-to-ceres.html Dawn's Chief Engineer and Mission Director Marc Rayman gives an update as the spacecraft's orbit takes it even closer to the dwarf planet Ceres. |
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Planetary Society Blog for Saturday 30 May 2015
On 5/31/2015 9:07 AM, The Planetary Society via sci.space.science Admin
wrote: Planetary Society Blog /////////////////////////////////////////// For LightSail Test Mission, Waiting is the Hardest Part Posted: 29 May 2015 02:02 PM PDT http://www.planetary.org/blogs/jason...dest-part.html The Planetary Society's LightSail spacecraft is now entering its second week of silence. Shades of the old ordeal with the Mars Climate Orbiter. I read elsewhere that the probe launched with a known issue in its software. That being that live ping transmissions from the spacecraft were being logged in memory, until that memory was exhausted and then the software crashed. Seems unlikely they will be able to revive this craft unless there was a secondary control channel to allow remote restart of the processor. That appears to not be the case here. I'd say this one is one and done. What I find of note is that there was apparently no use of a watchdog timer. That would have forced the probe to restart on its own once the hardware watchdog triggered. Seems like a rookie mistake. Ah well, hopefully the Planetary Society didn't blow the budget on this one. Another kickstarter folks? Dave |
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Planetary Society Blog for Saturday 30 May 2015
In article , says...
On 5/31/2015 9:07 AM, The Planetary Society via sci.space.science Admin wrote: Planetary Society Blog /////////////////////////////////////////// For LightSail Test Mission, Waiting is the Hardest Part Posted: 29 May 2015 02:02 PM PDT http://www.planetary.org/blogs/jason...dest-part.html The Planetary Society's LightSail spacecraft is now entering its second week of silence. Shades of the old ordeal with the Mars Climate Orbiter. I read elsewhere that the probe launched with a known issue in its software. That being that live ping transmissions from the spacecraft were being logged in memory, until that memory was exhausted and then the software crashed. Seems unlikely they will be able to revive this craft unless there was a secondary control channel to allow remote restart of the processor. That appears to not be the case here. I'd say this one is one and done. What I find of note is that there was apparently no use of a watchdog timer. That would have forced the probe to restart on its own once the hardware watchdog triggered. Seems like a rookie mistake. Ah well, hopefully the Planetary Society didn't blow the budget on this one. Another kickstarter folks? Planetary Society Regains Communication With LightSail Spacecraft MAY 31, 2015 8:14 AM ET http://www.npr.org/sections/thetwo-w...857/planetary- society-regains-communication-with-lightsail-spacecraft Jeff -- "the perennial claim that hypersonic airbreathing propulsion would magically make space launch cheaper is nonsense -- LOX is much cheaper than advanced airbreathing engines, and so are the tanks to put it in and the extra thrust to carry it." - Henry Spencer |
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Planetary Society Blog for Saturday 30 May 2015
Le 5/31/15 6:35 PM, David Spain a écrit :
On 5/31/2015 9:07 AM, The Planetary Society via sci.space.science Admin wrote: Planetary Society Blog /////////////////////////////////////////// For LightSail Test Mission, Waiting is the Hardest Part Posted: 29 May 2015 02:02 PM PDT http://www.planetary.org/blogs/jason...dest-part.html The Planetary Society's LightSail spacecraft is now entering its second week of silence. Shades of the old ordeal with the Mars Climate Orbiter. I read elsewhere that the probe launched with a known issue in its software. That being that live ping transmissions from the spacecraft were being logged in memory, until that memory was exhausted and then the software crashed. Seems unlikely they will be able to revive this craft unless there was a secondary control channel to allow remote restart of the processor. That appears to not be the case here. I'd say this one is one and done. What I find of note is that there was apparently no use of a watchdog timer. That would have forced the probe to restart on its own once the hardware watchdog triggered. Seems like a rookie mistake. Ah well, hopefully the Planetary Society didn't blow the budget on this one. Another kickstarter folks? What a bummer! I like the light sail concept. I hope they build another one with better success. Alain Fournier |
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Planetary Society Blog for Saturday 30 May 2015
On 5/31/2015 9:18 PM, Jeff Findley wrote:
Planetary Society Regains Communication With LightSail Spacecraft MAY 31, 2015 8:14 AM ET http://www.npr.org/sections/thetwo-w...857/planetary- society-regains-communication-with-lightsail-spacecraft Jeff Well that's good news! Glad to hear it. Glad I was wrong. I had also read that were they able to regain contact they would immediately attempt to deploy the sail, then maybe attempt a software upgrade. As long as it's talking to them there is that possibility. So watchdog after all perhaps? Dave |
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