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The Planetary Society Weblog
Chat Log
12:04 ZeroOne : Emily's
Enceladus images:
12:05 CargoCult : The images in the top row look really familiar - but I'm trying
to think what they remind me of so much...
12:05 loonyman : eutopa
12:05 loonyman : europa even
12:06 CargoCult : More elephant-skin. :]
12:06 ugordan : Yep, Europa with low gravity
12:06 ZeroOne : QUESTION: Conjecture on the upper-right lump in: this image
12:10 loonyman : QUESTION given that they have water and a potential source of
energy, will the pheonix team concentrate more on organics now?
12:12 dragonsyoung : yay
12:12 nick601-1 : QUESTION: What's the origin of the dark horizontal line noise
in many of Cassini's narrow angle camera data?
12:12 ZeroOne : nick601: Cassini Image FAQ http://saturn.jpl.nasa.gov/faq/raw-images.cfm
if she doesn't answer
12:13 loonyman : QUESTION will they have slower flybys in the future?
12:13 rickqualls : "QUESTION" Did the thrusters roll the rock near
Stone Soup?
12:13 dragonsyoung : its notable in the images thought i was seeing things at
first lol
12:15 nick601-1 : ah, thanks for the link zero1.
12:15 CargoCult : image here
12:15 CargoCult : High-quality version!
12:16 Joehaber1 : QUESTION Whats the gravity at Enceladus?
12:16 loonyman : thanks cargo
12:17 ugordan : Joe: the surface gravity is 0.0113 G
12:17 ugordan : A hundred times weaker than Earth's
12:17 Joehaber1 : QUESTION Did they have time to do 3d Views of Enceladus?
12:17 ZeroOne : Square boulders! Alert Hoagland!
12:18 loonyman : laser cutters
12:18 ugordan : I think the closest approach images are actually lossy compressed
so the CICLOPS versions are as good as they get
12:19 nick601-1 : you wonder what the exposure time is for those images
12:19 nick601-1 : given the fun combination of high albedo and a high-speed pass
12:20 loonyman : QUESTION was there any temperature measurement running this
flyby?
12:20 ugordan : I think exposures in the narrow angle camera were roughly 20
ms or thereabouts
12:20 ugordan : It helps that Enceladus is so bright
12:20 nick601-1 : indeed :)
12:21 loonyman : giant crystals?
12:21 CargoCult : 1/50s in camera terms. ;]
12:22 ugordan : Which is fast for NAC standards!
12:22 MoreInput : cool!
12:22 ZeroOne : Everybody's got one.
12:23 nick601-1 : they're excellent images
12:23 ugordan : lol
12:24 nick601-1 : the boulders may be nucleation centres from sulci emissions
12:24 KStu : reminds me of Galileo Ganymede pics...
12:24 loonyman : sulci?
12:24 nick601-1 : the cracks :)
12:24 loonyman : sorry
12:24 loonyman : im a tigerstripe guy :-p
12:24 nick601-1 : same thing!
12:25 CargoCult : image
12:26 alro613 : QUESTION: Does the 'round' formation fall in where they suspected
'hot-zone' is supposed to be? Perhaps it's a vent?
12:26 KStu : this is best pic, I think... that mysterious "lump"
12:27 nick601-1 : kinda like the round, upwelling features on Europa?
12:27 ugordan : Might be
12:27 ugordan : diapirs are what they're called
12:27 nick601-1 : nifty
12:28 loonyman : hmmmm I see a patern forming :-)
12:28 ZeroOne : Lump!
12:28 KStu : we really need a proper nickname for that! ;-)
12:28 loonyman : icebreaker!!
12:29 Funkopolis : It looks like a bottle...
12:29 DEChengst : ugordan: thanks :)
12:29 dragonsyoung : crashed ship
12:29 ZeroOne : Polyp
12:29 KStu : remember the start of "Alien"...? :-O
12:29 Funkopolis : Enceledus may have water, but it may also have skin cancer
12:29 dragonsyoung : XD
12:30 nick601-1 : hm, the Latin for lump is apparently 'offa'
12:30 Funkopolis : QUESTION: Any similar formations on Earth/anywhere else that
could be clues?
12:31 dragonsyoung : QUESTION: these new images would serjest recent tectonic
activeity?
12:31 KStu : (clues to which formation Funk?)
12:31 dragonsyoung : kinda reminds me of glashers
12:31 Funkopolis : the lump/node/bottle/tumor on Encel, kstu
12:31 ugordan : I think he might be thinking of the 2Hz banding, not the line
truncation
12:31 KStu : thanks F
12:32 mammoth : QUESTION: How do you de-interlace the raw Cassini images?
12:32 loonyman : QUESTION as there is a large portion of enceladus that is pretty
batterd, and south pole looks so like Europa, does this confirm the "bloody
big lake " rather than the "global ocean" theory?
12:32 DEChengst : mammoth: you can use the deinterlace filter in Photoshop
12:32 mammoth : thanks
12:33 CargoCult : QUESTION: in the Enceladus close-ups, the base of some of the
larger 'cracks' looks much lighter than the surroundings. Is stuff falling in,
or being blown out? (Speculation!)
12:33 CargoCult : e.g. image
12:33 MoreInput : Enceladus looks like Europa
12:33 bjorn_jonsson : Actually you must be careful with the deinterlace filter
since it affects every other line, regardless of whether they are black or not
12:33 ugordan : yep, you need to select just the black portions
12:34 loonyman : QUESTION what sort of internal heating does this sort of motion
require, and any speculation on the source?
12:34 Funkopolis : QUESTION: Were any of the gas/particle sensors turned on at
all? Was there no venting going on at the time of the flyby? Or would the contrast
difference make it impossible to see?
12:35 KStu : (we've a long list of Qs now folks, so be ;patient ok ? :-) )
12:35 ugordan : lol
12:38 loonyman : QUESTION can we have a 2 hour camchat tonight ;-)
12:39 KStu : lol
12:39 KStu : no ;-)
12:41 KStu : ok folks, more q's... :-)
12:45 ugordan : QUESTION: How will the recent gravity pass help in constraining
the global/local melted portion?
12:45 nick601-1 : Titan's crust is uncoupled from the core iirc
12:45 nick601-1 : or at least it may be :)
12:45 Funkopolis : QUESTION: So are there plans for future/closer flybys?
12:46 ZeroOne : Next up is closer, in weeks
12:46 loonyman : october
12:46 Funkopolis : sweet
12:46 ugordan : The extended mission concentrates on Enceladus and Titan
12:46 ZeroOne : Instruments instead of cameras next pass
12:46 Funkopolis : I'm gonna dress as enceladus for halloween then. Think Belushi
in Animal House, but with ice water instead of mashed potatoes
12:46 loonyman : oct. 9th, 25km!!!!
12:47 loonyman : suck in those organics!!
12:47 loonyman : lol
12:47 CargoCult : ... and no doubt get bugs splatted against Cassini.
12:47 nick601-1 : either that or Enceladaus gets a Cassini-sized crater ;)
12:47 loonyman : pmsl
12:48 ugordan : yep
12:48 DEChengst : loonyman: nice, and we have the MESSENGER Mercury flyby three
days earlier
12:48 MoreInput : oct 25 is after the 10th september: start of LHC - end of world
:-)
12:48 loonyman : QUESTION could these big boulders be some form of crystal formation?
12:49 ugordan : good point on the plume visibility
12:49 loonyman : We live in wonderfull times folks :-)
12:50 nick601-1 : are you sure it's a 25km flyby? that's only about twice the
cruising altitude of a commerical jet
12:50 loonyman : yep, 15.5 miles
12:50 nick601-1 : wow
12:51 ugordan : their navigational accuracy is typically something like less
than 2 kilometers
12:51 loonyman : QUESTION allready warm fom what?
12:52 Funkopolis : QUESTION: Did the photos give any clues about the nature of
the 'hot spots'?
12:54 loonyman : QUESTION given these photos, dont you think this confirms a
dry prosses?
12:54 MoreInput : http://en.wikipedia.org/wiki/Clathrate
12:55 loonyman : QUESTION I meant WET prosses for the guesers, sorry
12:55 DEChengst : RichardLeis: all okay with HiRISE ?
12:56 volcanopele : hey hey all
12:56 ugordan : you're late, VP :D
12:56 DEChengst : volcanopele :)
12:56 volcanopele : glad I got some sleep after working on Enceladus all night
12:57 DEChengst : volcanopele is still bouncing from all the coffee
12:57 volcanopele : or a nap anyway
12:57 Funkopolis : <censored>, that's some commute... no wonder you're
late
12:57 nick601-1 : hehe
12:57 KStu : Hey Jason!
12:58 volcanopele : now we got the joy of caption writing, yeah...
12:58 KStu : CASSINI team did AWESOME job...
12:58 loonyman : I second that
12:59 ugordan : the image sharpness surprised me TBH
12:59 ugordan : absolutely no motion smear
12:59 ugordan : btw, VP, was the lossy compression used or is it just me?
12:59 DEChengst : yeah, the last time we got really close it was one sweared
mess
12:59 KStu : ok, no more questions folks...
12:59 volcanopele : ugordan: yes
12:59 loonyman : Hats off, you probably all know this link, but http://blogs.nasa.gov/cm/blog/cassini-aug08
is a must
01:00 volcanopele : in the skeet shot images
01:00 ugordan : was that purely because it's encoded faster?
01:00 volcanopele : data volume issue I presume
01:02 volcanopele : the boulders would break your fall
01:02 KStu : great job Emily, thanks!
01:02 surreyguy : Thank you!
01:02 MoreInput : happy vacation! thanks very much!
01:02 ZeroOne : Later
01:02 loonyman : Many Many thanks Emily
01:02 Funkopolis : Enjoy your holiday! thanks very much
01:02 ugordan : thanks, Emily!
01:02 dragonsyoung : yay ty emily
01:02 ZeroOne : Lou!
01:03 nick601-1 : thanks all, good chat
01:03 CargoCult : Thanks again!
01:03 redplanet1 : Thanks Emily! Have fun!
01:03 dragonsyoung : sounds grate
01:03 rickqualls : Happy Vacation!!!!
01:03 ZeroOne : out
01:03 Boggratt : Very interesting show, Thank You Emily...
01:03 surreyguy : 'bye!
01:03 MoreInput : Bye
01:03 KStu : some great questions tonight, thanks everyone! :-)
01:03 loonyman : our thanks to you!!! :-)
01:03 Funkopolis : Thanks for wranglin' 'em all, Stu
01:04 alro613 : Thank you for another great ustream..
01:04 Funkopolis : So, uh, did anyone press record? ;)
01:04 elakdawalla : Yes, it's archived now
01:04 elakdawalla : Should be on the show page
01:04 elakdawalla : A big thanks to Stu for question wrangling
01:04 Funkopolis : Cool. That was a good one.
01:04 loonyman : good work stu
01:05 KStu : no prob, easy when the Qs are all good ones.
01:05 volcanopele : sorry I only caught the end
01:05 dragonsyoung : grate show
01:05 dotdk : Stu: Youre trench color images are fantastic!
01:05 loonyman : emily, when are you gonna go and work for discovery channel
or something (you are bound to get snapped up soon!!!)
01:06 KStu : thanks dotdk, just love those trenches :-)
01:06 dragonsyoung : i agree
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