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Notes about cylindrical maps and perijove passes

We create cylindrical maps from the telescopic images supplied by our amateur astronomers, and we update them every 2 weeks. Jupiter has a dynamic atmosphere where winds in the belts (brown) and zones (white) go in opposite directions. Storms develop and evolve, and other atmospheric features come and go. With each new map, we move all of the POI markers — sometimes POIs disappear, sometimes they get torn apart.

In its 53 day orbit, Juno spends most of the time distant from Jupiter. The spacecraft swoops from the north to the south pole in just 2 hours, which we call a "perijove pass". That means that the images JunoCam can take are restricted to a swath of longitude – we will not be able to select from all the points of interest every orbit. On the Voting page we will say which POI's are likely to be within our field of view on a given perijove pass and you will participate in the selection of which POI's to image.

We will have a conversation on every perijove pass about which POIs to image, and the debate will be based on the threads of discussion associated with those POIs. 

General Comments

If you'd like to share commentary on Jupiter's atmosphere that is not related to a specific Point of Interest, please contribute below.


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  1. comment by Hornung on 2017-07-15 13:29 UT

    Jupiter doesn’t seem to have a solid surface like Earth or Mars. It’s just a huge ball of hydrogen and helium gas, with smidgeons of other substances included. So, there is no volcano under the Red Spot. But there are some hydrocarbons and chemicals like ammonium hydrosulfide in Jupiter’s air, and these may generate red-colored stuff when exposed to sunlight and other radiation striking the planet from outside. The white cloud bands, called “zones,” are pure ammonia crystals that freeze higher up in the atmosphere. The reddish bands, called “belts,” are this red-colored stuff I just mentioned. The red stuff is probably all over Jupiter, but covered up by the white zones because it is lower down in the atmosphere.

    Now for the Red Spot. Its cloud tops are even higher than the white zones are, thus exposing the red to view. I’m not sure why, but I think it’s because the gases and clouds in the Red Spot are warmer than average. Gas expands when it is heated, so the Red Spot rides buoyantly upward like a hot air balloon. But I’m not an astronomer, just a retired engineer.

  2. comment by BrianSwift on 2017-07-14 23:47 UT

    Question for the pipeline team - why is the south pole methane image JNCE_2017192_07M00065_V01-mapprojected.png rotated about 13 degrees relative to the companion RGB image JNCE_2017192_07C00064_V01-mapprojected.png.

  3. comment by Val_Thomas_Abapo on 2017-07-14 01:54 UT

    If stitched raw images from junocam would be shared - It would be great! Good day everyone!

  4. comment by Eudora-93 on 2017-07-14 01:26 UT

    Sorry but I am find it difficult to locate unprocessed images, I've looked all around, up and down pages. Looking for a url to point me toward Fit or Tiff files