| Revision as of 19:54, 6 July 2005 editVolcanopele (talk | contribs)Extended confirmed users, Pending changes reviewers1,788 edits →Mass and Density Figures← Previous edit |
Latest revision as of 13:01, 10 July 2024 edit undoQwerfjkl (bot) (talk | contribs)Bots, Mass message senders4,012,452 editsm Removed deprecated parameters in {{Talk header}} that are now handled automatically (Task 30)Tag: paws [2.2] |
| (490 intermediate revisions by more than 100 users not shown) |
| Line 1: |
Line 1: |
|
|
{{Talk header}} |
|
English pronunciation . |
|
|
|
{{Article history |
|
|
|action1=PR |
|
|
|action1date=18:02, 17 April 2006 |
|
|
|action1link=Misplaced Pages:Peer review/Enceladus (moon)/archive2 |
|
|
|action1result=reviewed |
|
|
|action1oldid=48723945 |
|
|
|
|
|
|
|action2=FAC |
|
|
|action2date=09:46, 2 June 2006 |
|
|
|action2link=Misplaced Pages:Featured article candidates/Enceladus (moon) |
|
|
|action2result=promoted |
|
|
|action2oldid=56463732 |
|
|
|
|
|
|
|action3=FAR |
|
== Atmosphere == |
|
|
|
|action3date=2016-07-26 |
|
|
|action3link=Misplaced Pages:Featured article review/Enceladus/archive1 |
|
|
|action3result=kept |
|
|
|action3oldid=729926532 |
|
|
|
|
|
|
|maindate=July 20, 2006 |
|
An atmosphere exists around every larger body of the solar system. The substantial information which is missing here is the pressure / density of the atmosphere. ] 18:52, 18 Mar 2005 (UTC) |
|
|
|
|currentstatus=FA |
|
:The press release announcing the discovery gave no information on the atmospheric properties, only that it is "substantial", whatever that means. --] 20:13, Mar 18, 2005 (UTC) |
|
|
|
|itn1date=5 April 2014|itn1link=Misplaced Pages:Main_Page_history/2014_April_5 |
|
|
|otd1date=2012-08-28|otd1oldid=509618644 |
|
|
|otd2date=2017-08-28|otd2oldid=797677356 |
|
|
|otd3date=2021-08-28|otd3oldid=1040895529 |
|
|
|otd4date=2023-08-28|otd4oldid=1172419350 |
|
|
}} |
|
|
{{WikiProject banner shell|class=FA|vital=yes|1= |
|
|
{{WikiProject Astronomy|object=yes|importance=Top|solar_system=yes|ss-importance=High}} |
|
|
{{WikiProject Volcanoes|importance=Low}} |
|
|
{{WikiProject Spoken Misplaced Pages}} |
|
|
{{WikiProject Weather|importance=Low |space-weather-task-force=yes}} |
|
|
}} |
|
|
<!--- Auto archiving configured by ] ---> |
|
|
{{User:MiszaBot/config |
|
|
|algo = old(60d) |
|
|
|archive = Talk:Enceladus/Archive %(counter)d |
|
|
|counter = 2 |
|
|
|maxarchivesize = 150K |
|
|
|archiveheader = {{tan}} |
|
|
|minthreadstoarchive = 1 |
|
|
|minthreadsleft = 0 |
|
|
}} |
|
|
|
|
|
|
{{old move|date=16 June 2022|destination=Enceladus (moon)|result=not moved|link=Special:Permalink/1095314267#Requested move 16 June 2022}} |
|
== False color image == |
|
|
|
{{Annual readership}} |
|
|
==Cassini flyby of plume == |
|
|
The data gathered by Cassini in her final flybys in October (E21) and December 2015 (E22) are expected to yield some clues regarding the chemistry of the moon's ocean and prospects for some form of biochemistry. The data may not be published until December 2016, it seems.... |
|
|
|
|
|
|
: Cassini did a final flyby of Enceladus in late October that targeted the chemistry of the plumes directly. The INMS team, which includes Glein, is searching for molecular hydrogen in that plume, which would be chemical evidence of active serpentinization. An absence of molecular hydrogen would be a sign that the serpentinization is extinct. The data analysis from this flyby may be completed in time for the American Geophysical Union's fall meeting in December. Glein added that the planned NASA mission to Europa includes advanced descendants of both the CDA and INMS instruments, meaning that in a decade or two, scientists can start to make these same measurements at Europa. This will allow us to better understand the importance of serpentinization across the Solar System. |
|
I definitely prefer the old picture over the new false color image. I will revert, if nobody objects! ] 13:15, 27 Apr 2005 (UTC) |
|
|
|
|
|
|
|
http://www.space.com/32021-how-life-friendly-is-enceladus-ocean.html |
|
Done. ] 13:55, 28 Apr 2005 (UTC) |
|
|
|
|
|
:Yes, on ] the concensus was that the main image of a body should look as realistic as possible. Specifically, false-colour images were considered inferior. In fact, apparently you were the one who reverted that one. :-) --] 17:52, Apr 28, 2005 (UTC) |
|
|
|
|
|
::I'm not at all sure that the current image has true colors whatever that means. Enceladus, with its extremely high albedo, is actually bright white or gray, not brown like in this image which looks like a colorized one. But I've to admit that the current image looks much better.--] 19:45, Apr 28, 2005 (UTC) |
|
|
|
|
|
Yes, there should be a better picture, since this is an old Voyager image, I believe. I will take a look at the JPL/Cassini image archive. ] 19:58, 28 Apr 2005 (UTC) |
|
|
|
|
|
I can only find raw images, close-up images of the surface, or false color images that are better than the Voyager image. All other visible light images from the whole moon have less resolution. However, those pictures show a white surface! Should we replace? ] 20:14, 28 Apr 2005 (UTC) |
|
|
|
|
|
Personally I would include both on the page. Most of the images I have added following my revisions earlier this month are high resolution images that don't show the whole disk and perhaps one of the full disk images from Cassini could be added to highlight the blue cliffs of Enceladus (to go along with the high resolution image I have for that purpose. ] 17:37, Jun 20, 2005 (UTC) |
|
|
|
|
|
== Mass and Density Figures == |
|
|
|
|
|
I have updated the mass and density numbers for Enceladus based on a given by Zibi Turtle last month (not my only source of that information, but it is the only public mention of the change that I am aware of). The density figure is now 1.6 g/cm<sup>3</sup>, compared to the previous value of 1.3. This update is based on the Cassini NAV team's assessment of the reconstructed trajectory of Cassini following two recent flybys. This makes Enceladus denser than the other Saturnian mid-sized icy satellites, suggesting that it is composed of more iron and silicates that those other moons. I'm planning on making a mention of this in the article itself. ] 22:06, 01 Jun 2005 (UTC) |
|
|
|
|
|
There have been a few updates to the mass numbers lately by other members, mostly because I forgot to change the source on some more recent figures. I have once again put in the more recent numbers (1.08x10^20 kg; 1.61 g/cm^3) based on the GM numbers in the Cassini pck SPICE kernels. I have now linked to the source of those numbers, but the calculations are my own. If others want to check my work, go ahead, just make sure to read the documentation in the source document on the units used for GM (gravitational constant times the mass), so you do the right conversions. I also used a different radius for density, escape velocity, and surface gravitational acceleration from the March 9 flyby. ] July 6, 2005 19:54 (UTC) |
|
|
|
|
|
== Major changes coming == |
|
|
|
|
|
I am working on some major edits to the Enceladus article after having spending the last week working on Enceladus images. The edits will be confined to the "Physical Characteristics" section, plus a new section on the history of Enceladus exploration. The Physical Characteristics section will have the following outline: |
|
|
|
|
|
* Interior |
|
|
* Surface |
|
|
** General Geology |
|
|
*** Voyager 2 results |
|
|
*** New Insights from Cassini |
|
|
** Impact Craters |
|
|
** Tectonics |
|
|
** "Planitia" |
|
|
** Cryovolanism? |
|
|
* Atmosphere |
|
|
|
|
|
This would generally follow an inside out approach to discussing this satellite. The atmosphere section will largely remain intact as it is now, though I may de-emphasize the "current events" nature of the section. |
|
|
|
|
|
Just wanted to give a heads up to the changes I am working on. |
|
|
|
|
|
- ] 19:29, Jun 3, 2005 (UTC) |
|
|
|
|
|
== Temperature == |
|
|
|
|
|
What is Enceladus' surface temperature? Googling seems to mostly repeat the tidbit mentioned here, that is to say 70 K. But that's way too hot for the albedo of 0.99! 70 K implies an albedo of 0.67-0.68; an albedo of 0.99 implies 29 K (but that value is very sensitive to the actual albedo at that point). Anyone have an actual measurement they can quote? |
|
|
|
|
|
] 2005 July 5 03:43 (UTC) |
|
|
|
|
|
says it was measured in February. What was the result? |
|
|
|
|
|
] 2005 July 5 03:45 (UTC) |
|
|
|
|
|
I recently read a source with temperatures derived from Voyager IRIS data. I'll need to find it again and post the information here. In terms of Cassini results, I don't think the Cassini CIRS results from the flyby have been posted, and certainly not temperature data, AFAIK. |
|
|
Also, don't forget that other factors contribute to surface temperature, including surface roughness, as well as albedo. |
|
|
] July 6, 2005 19:44 (UTC) |
|
The data gathered by Cassini in her final flybys in October (E21) and December 2015 (E22) are expected to yield some clues regarding the chemistry of the moon's ocean and prospects for some form of biochemistry. The data may not be published until December 2016, it seems....
level-4 vital article is rated FA-class on Misplaced Pages's content assessment scale..jpg){kind=small}
