For those of you who are interested in checking out this exciting hobby, following is a list of many current data sources for rapidly released planetary image data. You may also want to check out my explainer on data types and software tools, my space image processing tutorials, and the work of amateur space image processing enthusiasts.

Missions that release image data directly (or nearly directly) to the Internet upon receipt from space

Missions that release image data in batches within weeks of receipt from space

New Horizons: Data from its Long-Range Reconnaissance Imager are released on Fridays, with each release including images returned as of the preceding Tuesday. Images are converted to JPEG format and automatically contrast-stretched before release. This mission is almost done returning all its data.

Juno: Data from JunoCam are released at weekly intervals, including data about a week to two weeks old, in a couple of formats. Right now and through October they are working on a "Marble Movie" with frames appearing at this buried location roughly once a week. When I notice that they have appeared, I download and repost them here.

Missions that do very rapid (within weeks to 3 months) release of science-quality data

(Apart from the ones mentioned above)

Rosetta: Navcam releases its science-quality data in monthly batches, with the most recent images being less than a month old. Sadly, that mission ends next week.

Navcam releases its science-quality data in monthly batches, with the most recent images being less than a month old. Sadly, that mission ends next week. Mars Reconnaissance Orbiter: HiRISE releases science-quality data in quarterly batches, with the most recent images being about a month old. You can browse it in their HiRISE image catalog, or use the map interface at ASU.

All other NASA and ESA planetary mission data becomes public eventually, typically released between 6 and 12 months after acquisition, to NASA's Planetary Data System or ESA's Planetary Science Archive. There's a bit of a learning curve involved, but it can be really rewarding to dig through these archives. Here's an introductory explainer on the PDS.

Go forth and enjoy all the pretty pictures!