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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 Yakage-67 on 2017-04-24 14:33 UT

    Taking a photograph of the dark side of Jupiter with a camera that's designed to capture only visible light wouldn't yield the same kinds of results that taking a photo of the illuminated side. Junocam only captures visible light, whereas Hubble captures images across a pretty wide swathe of the electromagnetic spectrum. You could negate the relative lack of light on the darker side of the planet by increasing exposure time, but movement of both the probe and the cloud layers would probably result in some fairly noticeable blurring.

    It's highly likely that we wouldn't see anything remarkably different in any photos of the unlit side of Jupiter. In the case of Hubble photos, astronomers are using a principle that amateur and professional astronomers know well - you're more likely to be able to see something in the sky if you gather more light. The sensitivity of the Hubble sensors allowed them to gather more light than previous telescopes or the human eye to capture those images. The same principle could apply to lengthening the exposure time on the darker side, but see my comment above about the impact on image quality.

    In any case, Jupiter rotates on its axis every few hours. Any phenomena on the "dark" hemisphere would just be clearly visible within less than half a day and could be photographed then. I know someone is then going to mention the "dark side" of the Moon, but that principle doesn't apply here. We only ever see the same side of the moon because of the way that its orbit around the Earth affects the amount of light that reaches its surface.

  2. comment by Andrew-Klekociuk on 2017-04-21 10:40 UT

    Definitely interested in the northern foot of the Io flux tube.

  3. comment by Alicemonet-89 on 2017-04-01 11:48 UT

    When I download pictures, they are png format. How I can download pictures, that those are raw format and I could modify them with D x O Optics. I suppouse there is very easy solution, but I just can't find it.

  4. comment by Manek-08 on 2017-03-31 03:51 UT

    Dose anyone knows what are those spikes around the horizon on the picture The Six Sister Credit: Gervasio Robert 2017-03-27 20:19 UT? out side the edge of the picture.