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Posted by: mgrodzki Mar 11 2007, 02:46 PM

When looking for good global images of Callisto… i keep seeing the same 2 or 3 and they look false color (especially from voyager). does callisto suffer from the lack of global images as europa does? also wondering if any of you magicians have worked your magic on any callisto images that are not in the mainstream.

Posted by: Decepticon Mar 11 2007, 05:28 PM

How about this?

Posted by: tedstryk Mar 11 2007, 07:59 PM

Well, there is this shot from Voyager:



Here is a Galileo shot (The only global view, other than a very distant one).



Here is another Galileo shot, processed by me.

Posted by: elakdawalla Mar 11 2007, 11:15 PM

Nice as usual, Ted. When was that second Galileo one taken?

--Emily

Posted by: tedstryk Mar 12 2007, 12:13 AM

The one I processed is from I31 (with Voyager color). The Galileo photojournal image is from C30.

Posted by: mgrodzki Mar 12 2007, 12:53 AM

yeah, that half phase one is something i have never seen before. it reminds me of your europa and ganymede half phase images. io would make a nice complete set!

Posted by: mgrodzki Mar 12 2007, 12:56 AM

Here is a Galileo shot (The only global view, other than a very distant one).


that's the one i see all the time. those colors are whack… i guess there was missing info in that which makes the edges blue? seems like the same problem with the more well-known europa images too.

Posted by: tedstryk Mar 12 2007, 02:44 AM

QUOTE (mgrodzki @ Mar 12 2007, 12:56 AM)

Posted by: JRehling Mar 12 2007, 02:50 AM

It's kind of amusing how similar in appearance Mercury and Callisto are, besides being virtually identical in size. But what a difference otherwise.

Posted by: tedstryk Mar 13 2007, 12:38 PM

I have done my own version of the C30 image. It turns out the "red" channel is IR-9680, so my "red" for doing the color here is a blend of the green channel and IR-9680, to try to approximate red. For the grayscale, I used the IR-9680 data more heavily, as the dataset, like most Galileo sets, is very limited, so I needed it to bolster the image clarity. This is at the original image scale. The quality of the original images is too poor of super-resolution (in fact, it was hard to make it look decent without shrinking it).

Posted by: PhilHorzempa Jun 3 2007, 08:40 PM

Great work on the Callisto global views!

Now a request for the UMSF photo-magicians --
Have you assembled mosaics from
the High Resolution close-up images of Callisto from Galileo?


Another Phil

Posted by: MarcF May 29 2019, 08:30 PM

A long time ago, I was used to visit the Callisto Crater Database by LPI: https://www.lpi.usra.edu/resources/cc/cchome.html. It contains images and information about the 150 major impact craters on Callisto. A similar database about craters on Ganymede also exists: https://www.lpi.usra.edu/resources/gc/gchome.html.
To my surprise, both are still accessible (as well as a third database about Venusian craters). As a biological database curator, I'm aware that maintaining and updating such databases is a big work, but I think it is a pity that they have never been updated with Galileo data. Many pics, new names and other information could have been added. Is there any chance this could happen once in the future ?
Regards,
Marc.

Posted by: JRehling Jan 4 2021, 04:58 AM

I realize that this is a semiquaver off the title of this dormant thread, but I was looking over the plans for Europa Clipper and JUICE to see what coverage Callisto would receive and the numbers being reported are a total of 21 flybys: 9 by Europa Clipper and 12 by JUICE. This is almost half the number that Europa will receive from the two missions, so Callisto coverage will be quite good. Moreover, as the functional role of the flybys is to receive a gravity assist, they should be quite close as well, although perhaps the geometry (and diversity of flyby geometries) may not be so good, for the same reason.

Sadly, Callisto was on the far side of Jupiter when New Horizons made its flyby, and Juno doesn't have any plans to take any close images, nor did Cassini, so we're looking at an interval of almost 30 years between the last closeups from the Galileo Orbiter and the next one. When the wait is over, however, the coverage of Callisto should be great.