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Odd Galileo Observations |
 Mar 15 2007, 09:53 PM
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Founder  Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1  |
Perusing the PDS, looking for some ring-obs to compare with the NH stuff that's just come down... are these Galileo ring obs or something else?
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Mar 20 2007, 02:34 PM
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Founder Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Wow - I've never heard/seen of those images - were they NIMS or SSI?
Doug |
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Mar 20 2007, 02:57 PM
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#3
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 Interplanetary Dumpster Diver Group: Admin Posts: 4408 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I never heard that one. It wouldn't surprise me though. They were trying to study the exact configuration of the antenna. Had they switched to the folded up HGA, there was a chance for a substantially higher data rate. There was also, however, a high chance that this would end up garbling the data, making it uninterpretable. As I understand it, the command to switch back to the LGA would have to then be received through the HGA, so if the negative scenario played out, it would have been the end of the mission.
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| Guest_Analyst_* |
Mar 20 2007, 05:30 PM
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#4
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Guests |
QUOTE (tedstryk @ Mar 20 2007, 03:57 PM)  Had they switched to the folded up HGA, there was a chance for a substantially higher data rate. There was also, however, a high chance that this would end up garbling the data, making it uninterpretable. As I understand it, the command to switch back to the LGA would have to then be received through the HGA, so if the negative scenario played out, it would have been the end of the mission. This is simply wrong. They could (and would) have loaded a sequence to switch back to the LGA before trying to use the HGA for a short test. You don't have to command this in real time. This has nothing to do with the old computer. Voyager could do this too, look at the recent HYBIC test switch there. And even if this does not work for whatever reason, you end up in some kind of command loss routine, with the spacecraft trying to reestablish contact by switching hardware components. One such switch would be from HGA to LGA. They did not try the HGA because there has been no hope to use the HGA. Analyst |
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Mar 20 2007, 06:35 PM
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#5
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
QUOTE (Analyst @ Mar 20 2007, 10:30 AM) This is simply wrong... They did not try the HGA because there has been no hope to use the HGA. You're both wrong. They did try the HGA, and it didn't help. And just for fun, here's an actual reference (see page 46): http://descanso.jpl.nasa.gov/DPSummary/Des...Galileo_new.pdf -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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djellison Odd Galileo Observations Mar 15 2007, 09:53 PM
tedstryk QUOTE (djellison @ Mar 15 2007, 09:53 PM)... Mar 15 2007, 09:55 PM djellison Ahhh...
http://photojournal.jpl.nasa.gov/catalog/... Mar 15 2007, 10:10 PM djellison Other odd pictures... Mar 15 2007, 10:16 PM ugordan Would that be an Io - Amalthea mutual event? Mar 15 2007, 10:22 PM djellison I think it is - shows the albedo difference. Mar 15 2007, 10:28 PM volcanopele Do you have the date and time for that observation... Mar 15 2007, 11:15 PM djellison IMAGE_TIME = 1997-11-06T20:36:51.484Z Mar 15 2007, 11:21 PM volcanopele Nice Catch. I thought it was one of those on-chip... Mar 15 2007, 11:26 PM
tedstryk There were more images in the series. As I unders... Mar 15 2007, 11:36 PM djellison It's a bit odd - like a lot of SSI images, the... Mar 15 2007, 11:46 PM tedstryk The observation was a color view of Io. All but o... Mar 16 2007, 12:37 AM djellison So which PDS header thing am I missing - because ... Mar 16 2007, 08:15 AM tedstryk I inferred it from the horizontal and vertical pix... Mar 16 2007, 10:34 AM tedstryk I always thought this shot of Metis was neat. Mar 16 2007, 11:40 AM mchan Wow! I have not seen that one before. Thanks... Mar 16 2007, 12:06 PM ugordan Man, think of all the wasted Kodak moments Galileo... Mar 16 2007, 12:10 PM gpurcell Yep. I've always felt we saw Jupiter "th... Mar 16 2007, 07:18 PM JRehling QUOTE (gpurcell @ Mar 16 2007, 12:18 PM) ... Mar 16 2007, 07:56 PM tedstryk The real problem with the 95 percent has another, ... Mar 16 2007, 09:37 PM djellison The 5% we lost was about 95% of the images I'd... Mar 16 2007, 07:37 PM elakdawalla Just imagine how different our impression of the M... Mar 16 2007, 07:45 PM nprev Just out of curiosity, what prevented Galileo from... Mar 18 2007, 04:01 PM djellison You've got X hours of downlink at 120bps inste... Mar 18 2007, 04:23 PM nprev Gotcha...and DSN time is not an infinite commodity... Mar 18 2007, 04:41 PM helvick The other limit in the equation was the ~109Meg on... Mar 18 2007, 05:28 PM tedstryk QUOTE (helvick @ Mar 18 2007, 05:28 PM) T... Mar 18 2007, 06:02 PM tedstryk It is sad to look at some of the images and think ... Mar 18 2007, 06:12 PM tty QUOTE (helvick @ Mar 18 2007, 06:28 PM) T... Mar 18 2007, 06:19 PM tedstryk QUOTE (tty @ Mar 18 2007, 06:19 PM) Also,... Mar 18 2007, 06:33 PM nprev Good grief... ...I really had no idea that it was... Mar 18 2007, 06:06 PM edstrick They had put a software block on the tape recorder... Mar 19 2007, 09:23 AM CAP-Team I vaguely recall that Galileo shot some pictures o... Mar 20 2007, 02:33 PM tedstryk I was looking at page 57. Mar 20 2007, 06:45 PM tedstryk As it turns out, I wrongly remembered that the dat... Mar 20 2007, 06:43 PM AlexBlackwell QUOTE (djellison @ Mar 20 2007, 04:34 AM)... Mar 20 2007, 04:50 PM Edward Schmitz It strikes me that they could have uploaded a sequ... Mar 20 2007, 04:10 PM tedstryk The computer was extremely old. The switch from t... Mar 20 2007, 04:29 PM djellison WEll - it should be in the PDS somewhere - and it ... Mar 20 2007, 05:17 PM AlexBlackwell QUOTE (djellison @ Mar 20 2007, 07:17 AM)... Mar 20 2007, 05:23 PM Analyst Thanks. I should have said if they did not try the... Mar 20 2007, 07:25 PM tedstryk I have added some G28 images to my Jupiter page. ... Mar 21 2007, 11:47 AM ugordan Is that Europa's or Ganymede's shadow? Mar 21 2007, 02:37 PM tedstryk Not sure. I am at work right now, and don't h... Mar 21 2007, 02:38 PM ugordan I'd guess Europa judging by the fuzziness of t... Mar 21 2007, 02:53 PM |
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