Beagle 2 in HiRISE, Possible Targets |
Beagle 2 in HiRISE, Possible Targets |
Feb 14 2007, 05:04 PM
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
EDIT: Moved these posts from the Feb 14 HiRISE Release thread to here to collect all Beagle 2 search related stuff in one place.
I'm downloading them now too -- guess I can't blog about them until I've examined them very carefully! For a bit of history on the search, Here's a blog entry I wrote about this spot a while ago Here's the MOC team's take on that spot And here's the BBC page with the Beagle 2 team's take on it EDIT: and here's my updated blog entry with links to the Beagle 2 landing ellipse images split up into 40-MB chunks. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 17 2008, 09:16 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Two things have always put an entry-phase burn-up top of my list of Beagle 2 failure modes. Firstly, the lack of any parachute visible in MOC imagery (which would be very very visible) - and secondly - the fact that the B2 shape was Huygens like rather than Viking like.
Doug |
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Dec 18 2008, 02:19 PM
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Member Group: Members Posts: 613 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Two things have always put an entry-phase burn-up top of my list of Beagle 2 failure modes. Firstly, the lack of any parachute visible in MOC imagery (which would be very very visible) - and secondly - the fact that the B2 shape was Huygens like rather than Viking like. Eh? Huygens worked - not sure I follow. Havent read this new australian paper yet ; I always liked the ammonia-leaked-out theory |
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Dec 18 2008, 04:51 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
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Dec 18 2008, 05:52 PM
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
In all fairness, you can't compare surface conditions to entry conditions both probes experienced. Huygens entered at what, 6 km/s and isn't that a typical Mars entry velocity, too?
The bigger difference could have been entry angle, but even then if you had two identical probes on the outside and their centers of mass were located differently, they could behave entirely differently. A Huygens-lookalike probably isn't a bad thing by itself. -------------------- |
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Dec 19 2008, 12:25 AM
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#6
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Junior Member Group: Members Posts: 63 Joined: 18-November 08 Member No.: 4490 |
In all fairness, you can't compare surface conditions to entry conditions both probes experienced. Huygens entered at what, 6 km/s and isn't that a typical Mars entry velocity, too? According to the article, Beagle hit at mach 35, around 12 km/s - it detached prior to orbital insertion, to save MEX a bit of delta-V. For us lesser beings reading this thread, the wiki on atmospheric re-entry is actually pretty decent. Here's the Casani report for people who feel like reading it. Note section 6.2.2 in particular. http://www.bnsc.gov.uk/5278.aspx That is interesting - plenty of critisism but on aeroentry the report states "Both the quantity and quality of the work performed are outstanding." They were asked to reduce weight from 108kg to 60kg in 1998, and less mass has to mean more susceptibility to any chaotic forces on entry. On another thread on MEX/B2 I mooted the idea of sending Beagle-3 on an SEP first stage - it could be delivered to GTO as a mission of opportunity (like SMART-1), and take its time to spiral to Mars. An SEP stage would allow a larger delivered mass - indeed as a first ever use of such a delivery method for a planetary craft, it could be seen as a test mission. This time EDL comms would be a must too.. Only this time, instead of Blur, we should ask Monty Python to sponser the mission. Beagle, as part of its EDL, should broadcast "The Liberty Bell" during descent, with the big foot coming down at the time of its landing! |
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