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Phobos-Grunt
SFJCody
post Dec 12 2011, 06:01 AM
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I think the re-soldering info was sourced from Anatoly Zak's page.

http://www.russianspaceweb.com/phobos_grunt_2011.html
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mchan
post Dec 13 2011, 02:56 AM
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QUOTE (ElkGroveDan @ Dec 11 2011, 09:29 PM) *
Here's one of the technicians taking a break during the procedure.


Mmm, kegs of ALE (Jet Fuel vintage 2006). Just what we need for the UMSF drinking game!
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elakdawalla
post Dec 13 2011, 07:48 AM
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QUOTE (SFJCody @ Dec 11 2011, 10:01 PM) *
I think the re-soldering info was sourced from Anatoly Zak's page.

Yeah, kind of a shocking amount of "news" in English language media is sourced from that page. Zak is pretty good but he's not a primary source, so I'd take anything sourced from his page with a grain of salt, because his news is only as good as his sources.

I had an interesting email exchange with a couple of writers for RIA Novosti's Science pages. They told me that most of their "unnamed sources" are actually people from within Lavochkin or Roskosmos who just won't speak on the record. Which is good as far as that goes, but people who are not speaking on the record are also less obligated to be completely truthful or to tell the whole story, so while I'm slighly reassured, I'm still leery of those "unnamed sources." As for official sources, well, it's Russia, so there's a nonzero chance that officials are, if not lying, at least glossing over certain facts or not telling the whole story. Given all these uncertainties I still try to stick as much as possible to reporting on the official story, if only because that'll make it easier to discover eventually if there is a contradiction that makes it clear that there was something fishy about some part of the official story.


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PDP8E
post Dec 14 2011, 03:51 AM
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Here is a recent article (dated today 12/12/2011) on "universe today" about FG

http://www.universetoday.com/91766/russian...grunt-re-entry/

It was submitted by David Warmflash, M.D., an astrobiologist and science lead for the U.S. team of the Planetary Society's Phobos Living Interplanetary Flight Experiment.


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Daba
post Dec 17 2011, 06:49 PM
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According to Simone Corbellini, who calculated this from flare observations, FG maintains Sun orientation on the longitudinal axis. He added the prediction calculation to his website.

http://www.satflare.com/track.php?q=phobos#LIST
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Daba
post Jan 5 2012, 07:58 AM
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Another stunning video from Thierry Legault!

http://legault.perso.sfr.fr/phobos-grunt.html
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dilo
post Jan 5 2012, 09:24 AM
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I see some similarities...
Attached thumbnail(s)
Attached Image
 


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tedstryk
post Jan 5 2012, 02:25 PM
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Seriously, Dilo? The chap in the picture on the left clearly isn't wearing sunglasses.


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dilo
post Jan 5 2012, 02:42 PM
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Well, glasses are clearly reflecting the Earth glow! wink.gif


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hendric
post Jan 5 2012, 05:26 PM
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Looks like it is still maintaining orientation. Really wish they could have saved it.


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dilo
post Jan 5 2012, 10:04 PM
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Just discovered that Roscosmos gives daily orbital values:
http://www.roscosmos.ru/main.php?id=375
I made plots from these data:
Attached Image

Note that perigee distance is noticeably higher compared to Corbellini's last plot (192km vs 227km):
http://www.satflare.com/track.php?q=phobos#MAP


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Jaheira
post Jan 6 2012, 06:12 PM
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QUOTE (hendric @ Jan 5 2012, 05:26 PM) *
Looks like it is still maintaining orientation. Really wish they could have saved it.

I hope the Russians actually learn some lessons from all of this. Most importantly, to include an onmidirectional low gain antenna on all deep space missions that CANNOT be obscured whatever the circumstances.
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Greg Hullender
post Jan 6 2012, 09:21 PM
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I can't think of an easy way to estimate the reentry date. However, we know the resistance will climb exponentially as the altitude decreases, and, based on the slope change at the end of that altitude curve, it won't be long. has anyone made a prediction?

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hendric
post Jan 6 2012, 09:34 PM
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QUOTE (Jaheira @ Jan 6 2012, 12:12 PM) *
I hope the Russians actually learn some lessons from all of this. Most importantly, to include an onmidirectional low gain antenna on all deep space missions that CANNOT be obscured whatever the circumstances.

Well, as Doug has said repeatedly, it's all about tradeoffs. How many potentially small-chance events do you design against before you are providing less benefit than it's worth is always going to be a judgement call.

On the other hand, comms is pretty critical to making sure you *understand* that last failure. (re: Beagle/MPL/DS2/etc)


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jamescanvin
post Jan 9 2012, 09:06 AM
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QUOTE (Greg Hullender @ Jan 6 2012, 09:21 PM) *
I can't think of an easy way to estimate the reentry date. However, we know the resistance will climb exponentially as the altitude decreases, and, based on the slope change at the end of that altitude curve, it won't be long. has anyone made a prediction?


Follow @PhG_Reentry

Currently 16th Jan 07:15 UTC +/- 36 hours


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