Philae Wakes Up! |
Philae Wakes Up! |
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#1
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 ![]() |
Got the info from a Radio that CNES get a 2mn contact with Philae last nigth and 40 second of data.
Please take this info with due precautions waiting for confirmation before opening a new topic. http://tempsreel.nouvelobs.com/en-direct/a...-spatiales.html -------------------- |
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#2
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![]() Member ![]() ![]() ![]() Group: Members Posts: 244 Joined: 2-March 15 Member No.: 7408 ![]() |
That new Rosetta Blog post contradicts the conclusion I reached regarding the latest timestamps. It says "the contact on 24 June started at 17:20 UT (on board Rosetta)". That is only 4 minutes before the first power system data point, so if the contact with Rosetta started at 17:20 UT, the timestamp couldn't possibly be the time it was received on the ground, because the signal travel time from Rosetta to Earth is around 16 minutes right now.
Either the two reported ground receipt times I used last night (to determine the nature of the timestamps) erroneously reported Rosetta contact times as ground receipt times, or the latest blog post is wrong, or the meaning of the timestamp changes for some reason. I'm inclined to believe that the latest blog post is correct and that the earlier reports simply misreported spacecraft times as ground times, because that makes the most sense, since the timestamps in the power system data from November 2014 are definitely spacecraft times and I don't have any other reason to think they would change. If they are Rosetta times, then that is good news because they indicate times that Rosetta was in stable-enough communication with Philae. I've never touched a SPICE kernel before, nor do I know much about them, but I may just have to play around with them later to see if I can figure out where Rosetta was during those contacts with Philae. The time spans of power system data points from the post-wakeup contacts are (all times UTC): 2015-06-13 20:28:46.025 - 2015-06-13 20:29:29.839 (84 Philae power system data points) 2015-06-14 21:22:51.609 - 2015-06-14 21:23:14.022 (only 2 data points) 2015-06-19 13:20:36.425 - 2015-06-19 13:35:58.438 (8 data points) 2015-06-20 13:55:29.277 - 2015-06-20 14:04:05.573 (62 data points) 2015-06-20 15:59:17.222 - 2015-06-20 15:59:31.859 (113 data points) 2015-06-21 02:32:53.429 - 2015-06-21 02:33:10.115 (20 data points) 2015-06-21 02:43:50.338 - 2015-06-21 02:44:16.879 (47 data points) (There was a MUPUS timestamp of 2015-06-21 02:44:16 tweeted as well) 2015-06-24 17:24:11.336 - 2015-06-24 17:37:24.992 (4 data points) (You could extend that range to the MUPUS timestamp tweeted yesterday, which was 2015-06-24 17:38:43) |
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