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Beagle 2 in HiRISE, Possible Targets
elakdawalla
post Feb 14 2007, 05:04 PM
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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


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dvandorn
post Dec 18 2008, 06:34 PM
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As I understand it, though, what's now being speculated is that Beagle 2 failed to successfully cross transition boundaries, not that the heat shield failed during the heat pulse. The shape of the entry vehicle is critical to how the vehicle maintains stability through hypersonic to supersonic velocities, and there are a lot of factors, including the actual atmospheric deceleration rate, that affect how the shape and the regime interact.

Huygens continued to decelerate at a faster and faster rate as it dug into Titan's thicker atmosphere. Beagle 2 continued moving faster for longer after it hit its maximum deceleration (which would have been less decel than Huygens saw, since Mars' atmosphere doesn't thicken with depth to the extent that Titan's does). I would be extremely surprised if Huygens and Beagle 2 were traveling at similar airspeed velocities a minute after the end of peak heating.

You would have to plug in speed, deceleration rate and air density throughout the descent profile for each probe to determine the differences in transition boundaries between the two events. I guess what I'm thinking is that Huygens was slowed more quickly and effectively, and thus plowed through the transition boundaries very quickly, with very little time for the vehicle to become unstable (and, as I recall, there *are* some indications that Huygens tumbled briefly at some points during its descent). Because of the thinner air, Beagle 2 slowed more slowly and spent more time passing through transition boundaries than Huygens did, thus increasing the possibility that both its spin rate and any inherent instability in the aerodynamics of the vehicle's shape would cause the craft to tumble while still in a fairly challenging heating regime.

Make sense?

-the other Doug


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Posts in this topic
- elakdawalla   Beagle 2 in HiRISE   Feb 14 2007, 05:04 PM
- - Zvezdichko   Hmm...after a quck glance nothing on these picture...   Feb 14 2007, 05:28 PM
- - elakdawalla   There are two HiRISE images labeled as being Beagl...   Feb 14 2007, 06:30 PM
- - elakdawalla   Here's the area right around that dark crater....   Feb 14 2007, 06:40 PM
|- - AlexBlackwell   QUOTE (elakdawalla @ Feb 14 2007, 08:40 A...   Feb 14 2007, 10:07 PM
- - Zvezdichko   So... it's sure that Beagle 2 is not in this a...   Feb 14 2007, 07:28 PM
- - djellison   Well - I've not looked at every sq. foot of th...   Feb 14 2007, 07:32 PM
|- - Zvezdichko   QUOTE (djellison @ Feb 14 2007, 07:32 PM)...   Feb 14 2007, 07:57 PM
- - djellison   Sorry to be brutal - but with that spec, it's ...   Feb 14 2007, 08:49 PM
- - elakdawalla   I am working on cutting up the part of the .jp2 th...   Feb 14 2007, 08:52 PM
- - djellison   One of them's easy to place - but not t'ot...   Feb 14 2007, 10:01 PM
- - djellison   A small house - I make that rock approx 1m across ...   Feb 14 2007, 10:17 PM
|- - AlexBlackwell   QUOTE (djellison @ Feb 14 2007, 12:17 PM)...   Feb 14 2007, 10:21 PM
- - djellison   To be fair you posted a link to "Astronaut Ch...   Feb 14 2007, 10:35 PM
|- - AlexBlackwell   QUOTE (djellison @ Feb 14 2007, 12:35 PM)...   Feb 14 2007, 10:46 PM
- - djellison   I know - that's what the caption says. Dou...   Feb 14 2007, 10:50 PM
|- - AlexBlackwell   QUOTE (djellison @ Feb 14 2007, 12:50 PM)...   Feb 14 2007, 10:53 PM
- - AlexBlackwell   Emily has a new blog entry.   Feb 14 2007, 10:57 PM
- - elakdawalla   ...and it contains the links to the pieces of the ...   Feb 14 2007, 11:00 PM
- - dvandorn   Outhouse Rock was indeed the smaller rock (roughly...   Feb 15 2007, 03:13 AM
- - Zvezdichko   Thank you, Emily! The chunks will help us a l...   Feb 15 2007, 08:10 AM
- - nprev   Does anyone happen to know the IR characteristics ...   Feb 15 2007, 09:04 AM
- - djellison   When I get home tonight I'll check if any spec...   Feb 15 2007, 10:11 AM
|- - ustrax   I have a candidate for the heatshield... A cand...   Feb 15 2007, 10:38 AM
- - djellison   Starting a thread for possible B2 stuff within HiR...   Feb 15 2007, 10:45 AM
|- - ustrax   Doug From your 3D rendering I would change my can...   Feb 15 2007, 10:47 AM
- - djellison   Fair play to you - it's an interesting target....   Feb 15 2007, 10:54 AM
|- - ustrax   QUOTE (djellison @ Feb 15 2007, 10:54 AM)...   Feb 15 2007, 11:07 AM
- - djellison   Depends how much of the EDL sequence worked. Burn...   Feb 15 2007, 11:15 AM
|- - ustrax   QUOTE (djellison @ Feb 15 2007, 11:15 AM)...   Feb 15 2007, 11:31 AM
- - prometheus   Beagle Splat? Looks like the main chute didn...   Feb 15 2007, 12:38 PM
|- - ustrax   QUOTE (prometheus @ Feb 15 2007, 12:38 PM...   Feb 15 2007, 12:46 PM
- - djellison   You're zoomed out by about 5x... to give you ...   Feb 15 2007, 01:15 PM
- - prometheus   Are we looking at the same area?   Feb 15 2007, 01:25 PM
- - djellison   Yes - you're zoomed out a huge ammount - perha...   Feb 15 2007, 01:31 PM
- - prometheus   I used Stereo Photo Maker with the 2.5 Mb jpg imag...   Feb 15 2007, 01:37 PM
|- - djellison   QUOTE (prometheus @ Feb 15 2007, 01:37 PM...   Feb 15 2007, 03:22 PM
- - prometheus   I used the wrong image scale. Sorry for that.   Feb 15 2007, 01:55 PM
|- - ustrax   I know that I promised to stand still and I also k...   Feb 15 2007, 03:04 PM
|- - Littlebit   QUOTE (ustrax @ Feb 15 2007, 08:04 AM) I ...   Feb 15 2007, 07:48 PM
|- - ustrax   Here I am again... I grabbed Beagle's last ...   Feb 16 2007, 02:56 PM
- - ugordan   What do you gain by reprojecting the image like th...   Feb 15 2007, 03:10 PM
|- - ustrax   ugordan, some sense of perspective I don't get...   Feb 15 2007, 03:15 PM
- - djellison   After The BA mentioned Emily's blog entry abou...   Feb 15 2007, 05:12 PM
|- - ElkGroveDan   QUOTE (djellison @ Feb 15 2007, 09:12 AM)...   Feb 15 2007, 05:49 PM
- - elakdawalla   Why up-range? Wouldn't it be down-range if pa...   Feb 15 2007, 05:54 PM
- - ElkGroveDan   I wasn't pegging it the failure on EDL malfunc...   Feb 15 2007, 06:18 PM
- - elakdawalla   As it turns out, the atmospheric aberrations cause...   Feb 15 2007, 06:45 PM
- - ElkGroveDan   Then I guess I'll only throw down a few small ...   Feb 15 2007, 06:52 PM
- - ugordan   I have to say, that bright object seems to be too ...   Feb 16 2007, 03:07 PM
- - djellison   Remember - a cosmic ray hit might be a single pixe...   Feb 16 2007, 03:58 PM
|- - ugordan   The point about map projection certainly holds. My...   Feb 16 2007, 04:06 PM
|- - ustrax   My oppinion too ugordan, mostly due to the fact th...   Feb 16 2007, 04:10 PM
- - djellison   As the simulation shows - it would be the right so...   Feb 16 2007, 04:13 PM
|- - ustrax   QUOTE (djellison @ Feb 16 2007, 04:13 PM)...   Feb 16 2007, 05:29 PM
- - ugordan   If only someone could sneak us the raw, non map-pr...   Feb 16 2007, 04:14 PM
|- - tuvas   QUOTE (ugordan @ Feb 16 2007, 09:14 AM) I...   Feb 16 2007, 05:03 PM
- - hendric   Doug, Have you tried map-projecting your simulat...   Feb 16 2007, 04:37 PM
- - djellison   There wouldn't be much point - I don't kno...   Feb 16 2007, 04:43 PM
- - ugordan   Well, having a sample of the artifacts wouldn...   Feb 16 2007, 05:07 PM
- - kenny   Alex is correct. That is a smaller rock beside Ho...   Feb 17 2007, 10:12 AM
- - Ames   Not sure about this one but it looks different to ...   Feb 17 2007, 11:52 AM
- - Sunspot   That feature looks quite interesting actually. Is...   Feb 17 2007, 12:16 PM
- - Ames   Yes 100% http://farm1.static.flickr.com/77/392880...   Feb 17 2007, 12:45 PM
- - djellison   Looks like a shadow behind an unusual shape rock. ...   Feb 17 2007, 01:19 PM
- - Sunspot   OK heres your "spot" resized up by 500% ...   Feb 17 2007, 02:00 PM
|- - Ames   Yep, propbably just a rock This one is a little d...   Feb 17 2007, 03:10 PM
- - JTN   FWIW, I've Zoomified one of the Beagle 2 ellip...   Feb 17 2007, 03:51 PM
- - Sunspot   Are there plans to take more images of the landing...   Feb 18 2007, 12:26 AM
- - AlexBlackwell   I don't know if this press release was mention...   Feb 23 2007, 06:47 PM
- - djellison   Emily pointed out that the Isidis image for Osiris...   Mar 7 2007, 09:14 PM
|- - FIN Mars   Beagle 2 Back Shell and Parachute? Probably not...   Oct 24 2008, 02:58 PM
- - djellison   Which image and what coords is that from? I woudl...   Oct 24 2008, 03:27 PM
|- - FIN Mars   QUOTE (djellison @ Oct 24 2008, 06:27 PM)...   Oct 24 2008, 04:51 PM
- - Sunspot   Beagle 2 may have tumbled to a fiery doom http://...   Dec 17 2008, 08:23 PM
|- - Paolo   QUOTE (Sunspot @ Dec 17 2008, 09:23 PM) B...   Jan 2 2009, 11:54 AM
|- - rlorenz   QUOTE (Paolo @ Jan 2 2009, 06:54 AM) Jour...   Jan 2 2009, 03:05 PM
- - djellison   Two things have always put an entry-phase burn-up ...   Dec 17 2008, 09:16 PM
|- - rlorenz   QUOTE (djellison @ Dec 17 2008, 04:16 PM)...   Dec 18 2008, 02:19 PM
|- - djellison   QUOTE (rlorenz @ Dec 18 2008, 02:19 PM) E...   Dec 18 2008, 04:51 PM
|- - ugordan   In all fairness, you can't compare surface con...   Dec 18 2008, 05:52 PM
|- - sci44   QUOTE (ugordan @ Dec 18 2008, 05:52 PM) I...   Dec 19 2008, 12:25 AM
- - mchan   It could be that a shape designed for the thicker ...   Dec 18 2008, 04:32 PM
- - dvandorn   As I understand it, though, what's now being s...   Dec 18 2008, 06:34 PM
|- - mcaplinger   QUOTE (dvandorn @ Dec 18 2008, 10:34 AM) ...   Dec 18 2008, 07:24 PM
- - Doc   Perfectly Doug! But the question now is what t...   Dec 18 2008, 07:22 PM
|- - Stu   QUOTE (Doc @ Dec 18 2008, 07:22 PM) Hones...   Dec 18 2008, 09:02 PM
- - Enceladus75   So the evidence from new analysis is pointing to a...   Dec 18 2008, 08:27 PM
|- - mcaplinger   QUOTE (Enceladus75 @ Dec 18 2008, 12:27 P...   Dec 18 2008, 08:45 PM
- - Enceladus75   QUOTE (mcaplinger @ Dec 18 2008, 08:45 PM...   Dec 18 2008, 08:57 PM
|- - mcaplinger   Here's the Casani report for people who feel l...   Dec 18 2008, 09:36 PM
- - climber   A bit OT but anyway, do you know if Phoenix EDL re...   Dec 18 2008, 08:58 PM
- - Doc   Don't you worry Stu, I vented my anger a long ...   Dec 18 2008, 09:41 PM
- - nprev   Well said, Stu. It should also be noted that in e...   Dec 18 2008, 09:51 PM
- - sci44   Well the Beagle 2 mission scientists (Pillinger, S...   Jan 3 2009, 03:14 PM
- - Zvezdichko   By the way, while I respect you opinion, I think t...   Jan 3 2009, 09:09 PM
|- - sci44   QUOTE (Zvezdichko @ Jan 3 2009, 09:09 PM)...   Jan 3 2009, 11:24 PM
- - djellison   Something I learnt from Mark Sims (Beagle 2) last ...   Apr 15 2009, 02:30 PM
- - Phil Stooke   That's going to make it a lot easier! M...   Apr 15 2009, 03:41 PM
- - ElkGroveDan   QUOTE (Phil Stooke @ Apr 15 2009, 07:41 A...   Apr 15 2009, 03:49 PM
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