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Death of a Spacecraft: The Unknown Fate of Cassini, Decision on Cassini's fate
Rakhir
post Nov 8 2006, 12:23 PM
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Death of a Spacecraft: The Unknown Fate of Cassini
http://space.com/businesstechnology/061108_cassini_fate.html

I like the Cassini Mercury crash option, even if unlikely.

Rakhir
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Big_Gazza
post Nov 15 2006, 10:53 AM
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QUOTE (Rakhir @ Nov 15 2006, 07:51 PM) *
RTGs are designed to have chance to survive a launch failure so they may also reach the surface of Titan almost intact (and thus not fully sterilized by the heat of the entry). They will then produce a significant heat for many decades.


Nope, don't believe a word of it. The RTGs may be designed to survive a launch accident within earths atmosphere while travelling at relatively low velocities, but slamming in an airless ball of cryogenic ice (ie hard as stone) at orbital velocity will result in complete vaporisation of the RTG and the ejection of vapourised plutonium fuel as part of the ejecta cloud. With the fuel so dispersed, the heating effects will be negligible.

Remember Deep Impact at Tempel 1? Does anyone really think that any part of the impactor survived intact?
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- Rakhir   Death of a Spacecraft: The Unknown Fate of Cassini   Nov 8 2006, 12:23 PM
- - ugordan   Yikes Rakhir, you should choose topic titles more ...   Nov 8 2006, 12:42 PM
|- - Rakhir   QUOTE (ugordan @ Nov 8 2006, 03:42 PM) Yi...   Nov 8 2006, 01:05 PM
|- - jsheff   QUOTE (Rakhir @ Nov 8 2006, 08:05 AM) Ind...   Nov 8 2006, 07:04 PM
|- - ugordan   You're not suggesting MGS is dead, are you?   Nov 8 2006, 07:21 PM
|- - jsheff   QUOTE (ugordan @ Nov 8 2006, 02:21 PM) Yo...   Nov 8 2006, 07:46 PM
|- - ugordan   I wouldn't write MGS off just yet. This is ...   Nov 8 2006, 07:52 PM
- - jsheff   QUOTE (Rakhir @ Nov 8 2006, 07:23 AM) Dea...   Nov 8 2006, 07:34 PM
- - Mariner9   It's been a long time since I got that A+ in O...   Nov 8 2006, 09:47 PM
- - Big_Gazza   Does anyone seriously consider the possibility of ...   Nov 9 2006, 12:07 AM
|- - Stephen   QUOTE (Big_Gazza @ Nov 9 2006, 11:07 AM) ...   Nov 9 2006, 01:55 AM
||- - ugordan   Since Huygens wasn't sterilized, I can't s...   Nov 9 2006, 08:01 AM
||- - Jim from NSF.com   QUOTE (ugordan @ Nov 9 2006, 03:01 AM) Si...   Nov 9 2006, 02:47 PM
||- - ugordan   Huygens had 35 approximately 1 Watt radioisotope h...   Nov 9 2006, 03:04 PM
|- - JRehling   QUOTE (Big_Gazza @ Nov 8 2006, 04:07 PM) ...   Nov 9 2006, 03:45 PM
- - tasp   Let's go to Chiron!   Nov 9 2006, 03:03 PM
|- - stevesliva   QUOTE (tasp @ Nov 9 2006, 10:03 AM) Let...   Nov 9 2006, 07:09 PM
- - Ant103   Maybe it's unprobable but, they can put Cassin...   Nov 10 2006, 10:41 AM
- - djellison   No......it can use gravity assists to try and get ...   Nov 10 2006, 12:38 PM
|- - ugordan   What I'd like to know is how plausible these S...   Nov 10 2006, 12:50 PM
|- - volcanopele   QUOTE (ugordan @ Nov 10 2006, 05:50 AM) W...   Nov 10 2006, 03:46 PM
- - nprev   Gotta admit, I like the Saturn system escape optio...   Nov 10 2006, 03:04 PM
|- - Bjorn Jonsson   QUOTE (nprev @ Nov 10 2006, 03:04 PM) Got...   Nov 10 2006, 04:03 PM
|- - JRehling   QUOTE (nprev @ Nov 10 2006, 07:04 AM) Got...   Nov 10 2006, 05:47 PM
- - nprev   ...okay, well that's that, then. I'll be l...   Nov 10 2006, 03:51 PM
- - nprev   Actually, I agree, Bjorn. However, wasn't ther...   Nov 10 2006, 04:32 PM
|- - ugordan   QUOTE (nprev @ Nov 10 2006, 05:32 PM) Wou...   Nov 10 2006, 04:46 PM
|- - Stephen   QUOTE (nprev @ Nov 11 2006, 03:32 AM) Wou...   Nov 15 2006, 01:26 AM
|- - nprev   QUOTE (Stephen @ Nov 14 2006, 05:26 PM) W...   Nov 15 2006, 01:42 AM
- - Sunspot   I sure i remember Cassini manager Bob Mitchell tal...   Nov 10 2006, 04:42 PM
- - nprev   Thanks, UG...I understand the situation much bette...   Nov 10 2006, 05:02 PM
- - Myran   I am afraid that volcanopele most likely are right...   Nov 10 2006, 07:34 PM
- - Greg Hullender   I've been impressed by Martin Lo's work on...   Nov 10 2006, 10:00 PM
|- - tedstryk   I think a big difference between Galileo and Cassi...   Nov 10 2006, 10:10 PM
|- - ugordan   Yeah, but Cassini needs to turn the HGA to Earth f...   Nov 10 2006, 10:25 PM
- - stellarlight   Some questions: Although it seems fascinating to ...   Nov 13 2006, 04:24 PM
|- - ugordan   1. The RTGs should last for a while. Radioisotopes...   Nov 13 2006, 04:33 PM
|- - JRehling   QUOTE (stellarlight @ Nov 13 2006, 08:24 ...   Nov 13 2006, 04:36 PM
|- - stevesliva   QUOTE (JRehling @ Nov 13 2006, 11:36 AM) ...   Nov 13 2006, 06:02 PM
||- - ugordan   Just to give an example of just how hard it is to ...   Nov 13 2006, 06:53 PM
|- - mchan   QUOTE (JRehling @ Nov 13 2006, 08:36 AM) ...   Nov 14 2006, 10:41 AM
|- - TritonAntares   QUOTE (JRehling @ Nov 13 2006, 05:36 PM) ...   Nov 14 2006, 11:50 PM
- - djellison   You need the Encounter MFD http://www.orbitermar...   Nov 13 2006, 08:32 PM
|- - ugordan   Hm... and I thought TransX was the advanced one ou...   Nov 13 2006, 08:36 PM
- - djellison   Trans X is all a bit complicated for me - the Enco...   Nov 13 2006, 08:39 PM
|- - ugordan   Yes, it's complicated and has a convoluted int...   Nov 13 2006, 08:47 PM
- - nprev   Sounds interesting to me too, TritonAntares. Speak...   Nov 15 2006, 12:14 AM
- - rogelio   Why dispose of Cassini as if it were some embarras...   Nov 15 2006, 12:59 AM
|- - Rakhir   QUOTE (rogelio @ Nov 15 2006, 03:59 AM) W...   Nov 15 2006, 08:51 AM
- - nprev   I appreciate your sentiments, but I'm actually...   Nov 15 2006, 01:34 AM
- - edstrick   Something I don't know but would like to... If...   Nov 15 2006, 10:16 AM
- - djellison   If one is truely worried about contaminating Enc o...   Nov 15 2006, 10:28 AM
- - Big_Gazza   QUOTE (Rakhir @ Nov 15 2006, 07:51 PM) RT...   Nov 15 2006, 10:53 AM
|- - ugordan   Not to mention the impact speed at Enceladus would...   Nov 15 2006, 11:41 AM
|- - Rakhir   QUOTE (Big_Gazza @ Nov 15 2006, 01:53 PM)...   Nov 15 2006, 11:51 AM
- - dvandorn   I will point out that the Apollo 13 situation isn...   Nov 16 2006, 03:23 AM
|- - Greg Hullender   QUOTE (dvandorn @ Nov 15 2006, 07:23 PM) ...   Nov 16 2006, 04:15 AM
|- - helvick   QUOTE (Greg Hullender @ Nov 16 2006, 04:1...   Nov 16 2006, 12:37 PM
|- - Rakhir   QUOTE (Greg Hullender @ Nov 16 2006, 07:1...   Nov 16 2006, 01:55 PM
|- - dilo   Only now I realized that, if they smash Cassini on...   Nov 19 2006, 05:38 PM
|- - stevesliva   QUOTE (Rakhir @ Nov 16 2006, 08:55 AM) Ju...   Nov 20 2006, 04:20 PM
- - nprev   Hmm...Maybe the answer is a highly elliptical orbi...   Nov 16 2006, 03:41 AM

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