Enceladus Rev 61 brush pass Wednesday 12th March 2008.

[exoscientist]

NASA To Release New Details From Close Flyby of Saturn Moon.<br />"NASA will hold a news conference at 2 p.m. EDT, Wednesday, March 26, to present new clues on the composition of the icy plumes jetting off the surface of Saturn's moon Enceladus. The findings were obtained March 12 during the closest flyby of the moon by the Cassini spacecraft."<br />http://newsblaze.com/story/20080320165927tsop.nb/newsblaze/TOPSTORY/Top-Stories.html<br /> <div class="Discussion_UserSignature"> </div>

 

[h2ouniverse]

Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>NASA To Release New Details From Close Flyby of Saturn Moon."NASA will hold a news conference at 2 p.m. EDT, Wednesday, March 26, to present new clues on the composition of the icy plumes jetting off the surface of Saturn's moon Enceladus. The findings were obtained March 12 during the closest flyby of the moon by the Cassini spacecraft."http://newsblaze.com/story/20080320165927tsop.nb/newsblaze/TOPSTORY/Top-Stories.html <br />Posted by exoscientist</DIV><br /><br />Dear all, the fly-by results are fantastic. Organics. (with C and N).<br />No ammonia (but logical as heat should have dissociated it into N2 and other <br />nitro-compounds, that are found, points to significant heat btw)<br />Speeds of jets up to several km/s. Density 100 times higher than expected...<br />

 

[h2ouniverse]

Organics confirmed: http://www.space.com/scienceastronomy/080326-cassini-flyby-update.html

 

[Philotas]

Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Organics confirmed: http://www.space.com/scienceastronomy/080326-cassini-flyby-update.html <br />Posted by h2ouniverse</DIV><br /><br />What is the origin of these organic molecules? Are they primordial? Could they be present on Europa also? <div class="Discussion_UserSignature"> </div>

 

[exoscientist]

<p>&nbsp;Anyone know what else we might have found out using the Cosmic Dust Analyzer if it had been working?</p><p>&nbsp;</p><p>&nbsp;&nbsp; Bob Clark<br />&nbsp; </p> <div class="Discussion_UserSignature"> </div>

 

[3488]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>&nbsp;<font color="#ff0000">Anyone know what else we might have found out using the Cosmic Dust Analyzer if it had been working?&nbsp;&nbsp;&nbsp; Bob Clark&nbsp; <br />Posted by exoscientist</font></DIV></p><p><font size="2" color="#003300"><strong>Hi Bob, its very difficult to know. The CDA AFAIK, measures the rate of impacting particles, so I guess, that we would have had a more accurate measure of the intensity of the particle ejections.</strong></font></p><p><strong><font size="2" color="#003300">Come August & October, I would geuss that mistake will not happen again.</font></strong></p><p><font color="#003300"><strong><font size="2">Below general makeup of the Enceladus plumes.</font><br /></strong></font><table border="0" cellspacing="0" cellpadding="0" style="display:inline;width:auto" id="ipb-attach-table-8900-0-06777600-1206638512"><tbody><tr><td><div id="ipb-attach-div-8900-0-06777600-1206638512" class="resized-linked-image" style="padding-right:8px;padding-left:8px;padding-bottom:5px;width:500px;padding-top:5px;height:413px;text-align:center"><div id="ipb-attach-ct-8900-0-06777600-1206638512" style="font-size:9px"><img style="vertical-align:middle" src="http://www.thespaceport.us/forum/style_images/1/img-resized.png" border="0" alt="" />&nbsp;Reduced 66%</div><img id="ipb-attach-img-8900-0-06777600-1206638512" style="cursorointer" class="ipb" src="http://thespaceport.us/forum/uploads/monthly_03_2008/post-774-1206570043_thumb.jpg" alt="Attached Image" title="Click to view full image" width="500" height="375" /> <div id="ipb-attach-cb-8900-0-06777600-1206638512" style="font-size:9px;margin:0px;text-align:center">1440 x 1080 (218.73K)</div></div>

 

[MeteorWayne]

<p>Very nice stuff, Andrew.</p><p>Tanks!! +<img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-cool.gif" border="0" alt="Cool" title="Cool" /></p> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[h2ouniverse]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>What is the origin of these organic molecules? Are they primordial? Could they be present on Europa also? <br />Posted by philotas</DIV><br /><br />Hi philotas</p><p>O,C and N quickly combine with H2 to form H2O, CH4, NH3 in the proto-stellar gas clouds.</p><p>Heat tends to break ammonia over time, forming C-N compounds (aminated compounds). Interesting as almost no ammonia has been found in the plume, as opposed to many C-N- compounds, indicating a significant heat source for a significant time.</p><p>&nbsp;On Titan or TNOs, CH4 exposed to radiation (in high atmosphere for Titan, no surface for TNOs) tends to form heavier carbonated chains, (starting with ethane C2H6), and in presence of NH3 or N2, C-N compounds. Even aromatic chains. </p><p>On icy bodies, NH3 tends to be "buried" as a first step, as the freezing of the water-ammonia will differentiate H2O from NH3, leaving an exterrnal shell of pure water ice and increasing gradually the concentration of NH3 in the subsyrface ocean, up to 32% (eutectic). Then, water-ammonia begins to freeze homogenously.</p><p>But most TNOs have N2 (gas or solid) on their surface. And Titan atmosphere is essentially N2. The formation of heavy carbonated chains results in large quantities of tholins.</p><p>&nbsp;Best regards.</p><p>&nbsp;</p>

 

[Philotas]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Hi philotasO,C and N quickly combine with H2 to form H2O, CH4, NH3 in the proto-stellar gas clouds.Heat tends to break ammonia over time, forming C-N compounds (aminated compounds). Interesting as almost no ammonia has been found in the plume, as opposed to many C-N- compounds, indicating a significant heat source for a significant time.&nbsp;On Titan or TNOs, CH4 exposed to radiation (in high atmosphere for Titan, no surface for TNOs) tends to form heavier carbonated chains, (starting with ethane C2H6), and in presence of NH3 or N2, C-N compounds. Even aromatic chains. On icy bodies, NH3 tends to be "buried" as a first step, as the freezing of the water-ammonia will differentiate H2O from NH3, leaving an exterrnal shell of pure water ice and increasing gradually the concentration of NH3 in the subsyrface ocean, up to 32% (eutectic). Then, water-ammonia begins to freeze homogenously.But most TNOs have N2 (gas or solid) on their surface. And Titan atmosphere is essentially N2. The formation of heavy carbonated chains results in large quantities of tholins.&nbsp;Best regards.&nbsp; <br />Posted by h2ouniverse</DIV></p><p>&nbsp;Thanks <strong>h2o</strong>, that cleared up things.</p> <div class="Discussion_UserSignature"> </div>