Here is Herschel's actual map (left). I compare it with a mid-20th Century map in the same projection (azimuthal, extending from the south pole at centre to the mid-latitudes in the northern hemisphere). There's no coordinate grid but it vaguely resembles the more modern map. It's the first map of Mars, but not the first map of another planet. Anyone care to speculate who made the first map of another planet, and which one? #maps#Mars#Herschel

Here is a modern (i.e. Cassini) map of Rhea with feature names:

https://asc-planetarynames-data.s3.us-west-2.amazonaws.com/rhea_comp.pdf

If you want to explore all such solar system names, go here:

https://planetarynames.wr.usgs.gov/

Use the menu bar underneath the banner image to explore names on maps of many worlds. You will notice asteroids are included. But interestingly, for some reason, not comets. I don't know why not. Even Rosetta's amazing comet 67P, which did get names in publications, never got official status for them. #maps #planets