I was looking for an inspiring image of a person on a horse riding out to adventure, in keeping with my 'back in the saddle' theme. Instead, I found something better. Almost exactly ten years ago (March 22, 2000) the spacecraft NEAR-Shoemaker took this image of the asteroid Eros. The major feature visible in the image is the 'saddle region'. On Earth, a 'saddle' is a geologic term for the depression between two mountains or hills. On Eros, it isn't clear what process was responsible for forming the saddle. There is an impact crater (5.5 kilometers in diameter) on the other side of the asteroid. This saddle might have formed by spallation from that event. Spallation occurs when a shock wave travels through a body and reaches the other side. As the wave interacts with the free boundary of the surface, material can be forced to break apart and be thrown outwards. Whatever the origin of the saddle, this prominent feature was chosen as the last resting place for the spacecraft itself. Almost exactly nine years ago, (February 12, 2001) NEAR was brought to a 4 mph landing right in the saddle. A position that took it out of contact with Earth forever.

Pax
Image credits: NASA, Public Domain
2 comments:
As an asteroid fan, I very much approve. I'm also reminded of another astronomical saddle, if one with a somewhat tenuous link: The Saddle Road on the Big Island of Hawaii crosses the island between Mauna Loa and Mauna Kea, and is the only way to get access to the observatories on the latter...
Keep writing!
Oh, good call. I forgot about the saddle road on the Big Island. Now you have me going through an internal trivia check of all the astronomy-related saddles I can think of ...
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