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Headshot of Emily Lakdawalla

Pretty picture: Jupiter photo from an unusual source

Posted by Emily Lakdawalla

26-12-2012 13:02 CST

Topics: Earth observing missions, Io, pretty pictures, astronomy by planetary missions, animation, Jupiter

One of the reasons I find Twitter so useful is that through the people I follow all over the world, I find out about cool things that I may never had heard of by any other means. Today's example: a nice little animation of a rotating Jupiter and moving Io, shot by Pleiades-1B. (Thanks to Daniel Fischer for the tweet.)

What's Pleaides-1B? It's a French Earth observation satellite that's intended to perform very high-resolution (50-centimeter) imaging of nearly any location on Earth with a daily cadence. It was launched on December 2.

The two Pleaides-1 spacecraft are described as being unusually "agile", in that they can do highly accurate off-nadir point-and-shoot imaging of targeted locations. As one step in Pleiades-1B's calibration and commissioning, it is being pointed at more than 1000 stars -- once again, as they have been for millennia, we steer our ships by the stars. This observation of Jupiter was commanded as part of the commissioning phase.

Jupiter and Io from Pleiades-1B (animation)

CNES / Astrium Services / Spot Image

Jupiter and Io from Pleiades-1B (animation)
A week after its December 2 launch, the high-resolution Earth-observation satellite Pleiades-1B pointed at Jupiter to take this sequence of eight photos. The photos are separated by about 45 minutes and were taken during the calibration and commissioning phase of the spacecraft.

I did have trouble figuring out which moon was in the animation, because the times given in the caption to the image don't quite match up with reality. It states December 7 between 1300 and 1800 GMT, but the first frame has a moon hidden behind the globe, which then comes out from behind it in the second frame. Io did that at roughly 0939 on December 7. Adding 33 minutes of one-way light time doesn't get me all the way to 1300. It has to be Io, because other moons would appear farther above Jupiter's equator, so I know I have the moon identification correct.

See other posts from December 2012


Or read more blog entries about: Earth observing missions, Io, pretty pictures, astronomy by planetary missions, animation, Jupiter


Patrick Wiggins: 12/27/2012 04:01 CST

Nice find. If Pleiades-1B does that well on Jupiter I can only imagine how well it will do when it turns it attention at the much closer features on Earth. Not that I doubted your method of identifying the satellite in the image but I thought I'd try confirming it by using the Great Red Spot as a guide. So I froze the Pleiades-1B animation at frame #5 which shows the GRS just coming around the limb. Then I used a really nifty iPad app from Software Bisque called Gas Giants. Moving through 7 December I stopped the app when the GRS was in the same position as in frame 5 of the animation and, sure enough, it showed Io in the same position as in frame 5 of the animation. The time, BTW, was about 14:30 UT.

Bob Ware: 12/30/2012 07:09 CST

That is some impressive imaging ability they have! The GRS and its surrounding areas meteorology look intriguing also. I hope to see the Earth imaging they are planning on doing. That should be really beneficial especially at the resolution of 50 cm as you stated. Thanks for the great post!

Leon Sll: 01/01/2013 07:11 CST

hi emily happy new year. Planet jupiter is a gas planet right?

Bob Ware: 01/05/2013 06:45 CST

Hi Leon -- The gas giants in our planetary system are Jupiter, Saturn, Uranus and Neptune.

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