Other than the Iapetus encounter, I noticed that flybys of Mimas (108,000 km), Enceladus (189,000 km), and Rhea (153,500km) are mentioned. Is anything planned for these flybys? I would normally just assume no, given their proximity to the Huygens mission (they are all on the 16th). But considering the Ta and Tc information sheets didn't mention the Tethys non-targeted flyby on Ta, I am surprised that they are mentioned at all. Given this, is any imaging planned?
Ted
Full Version: Other Satellites On Tc
Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw images
The one I know for sure about is Rhea, where we should get a good view of its giant ray crater (rays are giant, the crater itself maybe fairly small)
Great to hear. Will this include any of the wispy terrain?
QUOTE (volcanopele @ Dec 22 2004, 02:35 PM)
The one I know for sure about is Rhea, where we should get a good view of its giant ray crater (rays are giant, the crater itself maybe fairly small)
Do you know the approximate latitude and longitude of that crater ? I don't see it in Voyager-derived maps of Rhea (or maybe it's not obvious there), yet most of the areas in view in mid-January were rather well imaged by Voyager 1.
QUOTE (Bjorn Jonsson @ Dec 25 2004, 06:17 PM)
QUOTE (volcanopele @ Dec 22 2004, 02:35 PM)
The one I know for sure about is Rhea, where we should get a good view of its giant ray crater (rays are giant, the crater itself maybe fairly small)
Do you know the approximate latitude and longitude of that crater ? I don't see it in Voyager-derived maps of Rhea (or maybe it's not obvious there), yet most of the areas in view in mid-January were rather well imaged by Voyager 1.
Top Left bottom image Bjorn. http://astrogeology.usgs.gov/Projects/Satu...s/rhea_full.jpg
And link to site where this map was found.
http://astrogeology.usgs.gov/Projects/SaturnSatellites/
Another great link with the orginal voyager image with that crater.
http://planetary.org/saturn/rhea.html
http://planetary.org/saturn/rhea.html
Wasn 't sure if it was in the Voyager images, nor do I remember the lat and lon of the ray crater. I was just told that the images taken in January will show that ray crater.
I managed to figure this out myself. North seems to be roughly up in this image:
http://ciclops.lpl.arizona.edu/view.php?id=506
Assuming this I made the attached preliminary cylindrical map by adding the Cassini data to areas of lower resolution Voyager coverage. I only very crudely corrected for varying illumination. The big crater at upper left is visible in exactly the same location (but at lower resolution) in the Voyager based map so this map seems to be correct. Longitude 0 is at the center of the map. The next step is to render this thing to see what Cassini will image...
http://ciclops.lpl.arizona.edu/view.php?id=506
Assuming this I made the attached preliminary cylindrical map by adding the Cassini data to areas of lower resolution Voyager coverage. I only very crudely corrected for varying illumination. The big crater at upper left is visible in exactly the same location (but at lower resolution) in the Voyager based map so this map seems to be correct. Longitude 0 is at the center of the map. The next step is to render this thing to see what Cassini will image...
^Amazing!
Have you had time to do the same to dione using the recent images?
Have you had time to do the same to dione using the recent images?
Interesting...
From here bottom of page... http://www.planetary.org/news/2005/huygens...eline_0110.html
QUOTE
Spacecraft time (UTC) Ground time (UTC) Event
Jan 16
06:08 Jan 16
07:15 Cassini flies by Mimas
The flyby will be at a distance of 108,000 kilometers (67,000 miles) and a speed of 1.3 kilometers per second (2,900 miles per hour). This is just a little bit closer than Voyager 1 ever got.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
06:26 07:33 Saturn Periapsis
At a distance of 4.8 Saturn radii from the planet (or 290,000 kilometers, or about 180,000 miles), this is just outside the orbit of Enceladus.
11:58 13:05 Descending ring plane crossing
At a distance of 5.9 Saturn radii from the planet (or 360,000 kilometers, or about 220,000 miles), this is outside Enceladus' orbit, inside the E ring. Particles in the E ring are too small to be hazardous to Cassini.
15:51 16:58 Cassini flies by Rhea
The flyby will be at a distance of 153,500 kilometers (95,400 miles) and a speed of 5.1 kilometers per second (11,400 miles per hour). Voyager 1 got two times closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
Jan 16
06:08 Jan 16
07:15 Cassini flies by Mimas
The flyby will be at a distance of 108,000 kilometers (67,000 miles) and a speed of 1.3 kilometers per second (2,900 miles per hour). This is just a little bit closer than Voyager 1 ever got.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
06:26 07:33 Saturn Periapsis
At a distance of 4.8 Saturn radii from the planet (or 290,000 kilometers, or about 180,000 miles), this is just outside the orbit of Enceladus.
11:58 13:05 Descending ring plane crossing
At a distance of 5.9 Saturn radii from the planet (or 360,000 kilometers, or about 220,000 miles), this is outside Enceladus' orbit, inside the E ring. Particles in the E ring are too small to be hazardous to Cassini.
15:51 16:58 Cassini flies by Rhea
The flyby will be at a distance of 153,500 kilometers (95,400 miles) and a speed of 5.1 kilometers per second (11,400 miles per hour). Voyager 1 got two times closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
From here bottom of page... http://www.planetary.org/news/2005/huygens...eline_0110.html
I hope this means they are doing imaging.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
Not to mention that at Voyager's closest approach the scan platform was stuck and it didn't do any imaging at all!
I have noticed that there have been no raw images since those taken January 1. Is this due to the Titan encounter. I know it was going to stop at some point, but I didn't think it was that far out.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
Not to mention that at Voyager's closest approach the scan platform was stuck and it didn't do any imaging at all!
I have noticed that there have been no raw images since those taken January 1. Is this due to the Titan encounter. I know it was going to stop at some point, but I didn't think it was that far out.
QUOTE (tedstryk @ Jan 11 2005, 10:45 AM)
I hope this means they are doing imaging.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
Not to mention that at Voyager's closest approach the scan platform was stuck and it didn't do any imaging at all!
I have noticed that there have been no raw images since those taken January 1. Is this due to the Titan encounter. I know it was going to stop at some point, but I didn't think it was that far out.
06:16 07:23 Cassini flies by Enceladus
The flyby will be at a distance of 189,000 kilometers (117,000 miles) and a speed of 10.2 kilometers per second (22,800 miles per hour). Voyager 2 got 50% closer than that, but with the difference in quality between Cassini''s and Voyager's cameras, the Cassini images will be more informative.
Not to mention that at Voyager's closest approach the scan platform was stuck and it didn't do any imaging at all!
I have noticed that there have been no raw images since those taken January 1. Is this due to the Titan encounter. I know it was going to stop at some point, but I didn't think it was that far out.
I just took a look at the imaging plans for Tc, and yes, Mimas, Enceladus, and Rhea observations are planned to compliment the Iapetus, Tethys, Dione, and Phoebe coverage we have already.
QUOTE
Mimas, Enceladus, and Rhea observations are planned to compliment the Iapetus, Tethys, Dione, and Phoebe coverage we have already.
Phoebe?
What observations can we get from such a large distance we didn't get from the June flyby?
QUOTE (pioneer @ Jan 11 2005, 12:15 PM)
QUOTE
Mimas, Enceladus, and Rhea observations are planned to compliment the Iapetus, Tethys, Dione, and Phoebe coverage we have already.
Phoebe?
What observations can we get from such a large distance we didn't get from the June flyby? I meant that we already have regional scale (and in the case of Phoebe, local scale) coverage of Dione, Phoebe, Iapetus, and Tethys, and coverage in Tc will give us Enceladus, Mimas, and Rhea.
Looking at the Enceladus coverage, looks like it will be a gap fill in the leading hemisphere. Not as good as Voyager's best coverage, but it is much better than what we have of that region.
Why has no imagery from Jan 1 to Jan 6 when they turned the instruments off been posted?
Ted
Ted
QUOTE (tedstryk @ Jan 11 2005, 02:57 PM)
Why has no imagery from Jan 1 to Jan 6 when they turned the instruments off been posted?
Ted
Ted
Because no images were taken.
Good answer 
QUOTE
In order to serve a larger audience, we are temporarily disabling the raw image search function to allow a greater number of people to access press releases and materials related to the Huygens probe descent.
This service will return next week.
This service will return next week.
WHAT!
Great No raw images for week.
QUOTE (Decepticon @ Jan 15 2005, 12:39 PM)
WHAT!
Great No raw images for week.
Great No raw images for week.
That means we can't create any mosaics from the fly-bys on Sunday.
Exactly!
Does next week mean Sunday or a week from today?
Hopefully next week means next Monday (January 17). Actually I'm not surprised of this, yesterday it was almost impossible to access the Cassini website for several hours.
Meanwhile, here are some appetizers. First Mimas as it should appear near closest approach. The only problem is that I don't know when it will be imaged.
Meanwhile, here are some appetizers. First Mimas as it should appear near closest approach. The only problem is that I don't know when it will be imaged.
QUOTE (DEChengst @ Jan 15 2005, 12:47 PM)
QUOTE (Decepticon @ Jan 15 2005, 12:39 PM)
WHAT!
Great No raw images for week.
Great No raw images for week.
That means we can't create any mosaics from the fly-bys on Sunday. Well - you CAN - just not right now.
Doug
QUOTE (djellison @ Jan 15 2005, 02:51 PM)
Well - you CAN - just not right now.
I'm too lazy to wait that long
And here's Enceladus. As before, I do not know when it will be imaged, hardly near closest approach though since it occurs at a very high phase angle. The view near midnight looks nice though.
Note that the field of view in these renderings is 0.175 so Enceladus' relative size is two times what it will be in the actual images.
Note that the field of view in these renderings is 0.175 so Enceladus' relative size is two times what it will be in the actual images.
Have you done a rendering of Rhea for this orbit?
And finally, here's Rhea. These look a bit ugly since I used a preliminary map I did that contains data from a low-res Cassini image but I didn't remove the seams.
The bright rayed crater discussed earlier in this thread isn't visible until several hours after closest approach (i.e. not until the following midnight) so I assume Rhea will be imaged at at least two different times.
The field of view is 0.7 degrees, i.e. two times the FOV of Cassini's narrow angle camera.
Next project: An animation of the February Enceladus flyby.
The bright rayed crater discussed earlier in this thread isn't visible until several hours after closest approach (i.e. not until the following midnight) so I assume Rhea will be imaged at at least two different times.
The field of view is 0.7 degrees, i.e. two times the FOV of Cassini's narrow angle camera.
Next project: An animation of the February Enceladus flyby.
Went threw my bookmarks and I made a point of bookmarking latest 500 images just in case. (Last Week 
)
Keep an eye out for some pics since the Hyper Link was disabled on the Cassinni Page.
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
)Keep an eye out for some pics since the Hyper Link was disabled on the Cassinni Page.
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
Cool! Thanks. I thought they had really taken the raws down.
Ted
Ted
ISS imaging of Mimas, Rhea, and Enceladus is now on the ground.
You guys will love this view of Herschel 
Jason, do you know if the "raw images" section files are updated by a person or it is an automated process?
QUOTE (tedstryk @ Jan 16 2005, 07:06 PM)
Jason, do you know if the "raw images" section files are updated by a person or it is an automated process?
I believe it is an automated process, but sometimes it breaks.
New image of Mimas
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026509.jpg
look here if raw image link is still not available at cassini homepage
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
Thanks Decepticon for putting the link up
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026509.jpg
look here if raw image link is still not available at cassini homepage
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
Thanks Decepticon for putting the link up
Wow check out the groves on Enceladus
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026570.jpg
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026570.jpg
Another of Mimas
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026551.jpg
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026551.jpg
Check out the frosted craters on Rhea
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026548.jpg
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026548.jpg
Enceladus again
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026534.jpg
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026534.jpg
Enceladus with one crater all by itself
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026481.jpg
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026481.jpg
I think it's safe to say we can write off the idea of Europa being 'the smoothest moon in the solar system' in all the textbooks.
( yeah yeah, I know, the other hemisphere of Enceladus has craters... )
( yeah yeah, I know, the other hemisphere of Enceladus has craters...
)
I'm making color composites now for these...
Wow, this hemisphere of Enceladus looks much more interesting than the 'Voyager 2 hemisphere' which will be visible during the close flyby next month. Almost no craters are visible and those that can be seen are small.
Fortunately this hemisphere should be nicely covered during the targeted flyby in March.
Fortunately this hemisphere should be nicely covered during the targeted flyby in March.
To be honest - using RGB - there's little to be gained from a single b'n'w image
Slightly more on Enc using cl1-ir1 / p120-grn / p120-UV3
Cranking the levels a LOT with that - on the bottom image - you can see some sort of linear feature between two different types of surface very clearly - I dont think this is an imaging artifact - has this been seen before?
Doug
QUOTE (alan @ Jan 17 2005, 03:26 AM)
New image of Mimas
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026509.jpg
look here if raw image link is still not available at cassini homepage
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
Thanks Decepticon for putting the link up
http://saturn1.jpl.nasa.gov/multimedia/ima...7/N00026509.jpg
look here if raw image link is still not available at cassini homepage
http://saturn1.jpl.nasa.gov/multimedia/ima...?browseLatest=1
Thanks Decepticon for putting the link up
I knew it would come in Handy one day.
Enceladus will join my Most Favorite moon 2nd to Europa.
This moon may be going threw the same process as Europa.
I was hoping to see some Ice Volcanos!
This moon may be going threw the same process as Europa.
I was hoping to see some Ice Volcanos!
Maybe you will in February. If they exist, they may not be huge, or they may release flood "lavas" rather than plumes. Jason, do you know if VIMS took any data this orbit?
Here is my color attempt for Tc Rhea. After producing RGB color, I merged it with the clear filter image to use for grey, to mitigate the effects of spacecraft motion.
Here is my color attempt for Tc Rhea. After producing RGB color, I merged it with the clear filter image to use for grey, to mitigate the effects of spacecraft motion.
QUOTE (tedstryk @ Jan 17 2005, 06:54 AM)
Maybe you will in February. If they exist, they may not be huge, or they may release flood "lavas" rather than plumes. Jason, do you know if VIMS took any data this orbit?
Here is my color attempt for Tc Rhea. After producing RGB color, I merged it with the clear filter image to use for grey, to mitigate the effects of spacecraft motion.
Here is my color attempt for Tc Rhea. After producing RGB color, I merged it with the clear filter image to use for grey, to mitigate the effects of spacecraft motion.
Some of our Mimas and Enceladus observations were VIMS and UVIS ridealongs so I assume they took data as well.
For those doing color composites, I suggest IR3-GRN-UV3 for the Icy satellites. It seems to bring out some color.
QUOTE (djellison @ Jan 17 2005, 03:56 AM)
Slightly more on Enc using cl1-ir1 / p120-grn / p120-UV3
Cranking the levels a LOT with that - on the bottom image - you can see some sort of linear feature between two different types of surface very clearly - I dont think this is an imaging artifact - has this been seen before?
Doug
Cranking the levels a LOT with that - on the bottom image - you can see some sort of linear feature between two different types of surface very clearly - I dont think this is an imaging artifact - has this been seen before?
Doug
where did you get the images for the bottom frame?
More Rhea images to come. The images on the ground so far have a resolution ~3 km/pixel. There are 5 sets of observations left, with the next set having a resolution of 860 m/pixel.
They're identical to the top image - just stretching the brightness 'down' in photoshop
The more you take it down - the more obvious the deliniation between the two possible areas becomes.
Doug
The more you take it down - the more obvious the deliniation between the two possible areas becomes.
Doug
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