Bulls-eye (concentric craters)

[mckennapsean]

Please tag and discuss images you notice with bulls-eye / concentric craters.

[JimNumn]

I see a lot of central craters, surrounded by a circle of craters. Usually the central crater looks like a cone, which might mean the surrounding craters are actually volcanic subsidence.

So do I mark this as a single feature, a "bulls-eye," or as group of crater markings?

[IreneAnt]

Hi JimNumm,

If you could post an image of what you are talking about, that would be very helpful. I think you might be talking about the ejecta deposit around a crater, but I can't be sure until I see an image.

[JimNumn]

I can't seem to upload a sample today.

I'm looking at 00001.png.There is a large crater in the center of the photo. Half way to the bottom is a smaller, sharp-edged crater, with larger, less-defined craters at 12, 3 and 6 o'clock, with a hint of one between 9 and 10.

Is this what you mean by a bulls-eye crater? And if so, do I mark the complex as a single crater, or mark the center as one and the surrounding ones separately?

[IreneAnt]

Hi JimNumn,

I'm sorry, I don't know which image is 00001.png, so I can't comment.
Could you try to upload the image again? I would love to help you, but can't do that without seeing the image.

However, I can tell you that if you are in fact seeing a concentric crater, then that is 1 crater, not 2, and should be marked as a single crater. The bulls-eye is caused by different layers in the surface behaving slightly differently. Read more about that in the Surface Features Glossary, where you will also find a link to an image of a concentric crater on the Moon.

[CJSF]

Oh - so it's not a second impact making a "hole in one". I didn't realize that. Thanks for the clarification!

CJSF

[IreneAnt]

Happy to help <smiley face>

[WINSGER]

Decent, need to accomplish something like this with mine.

[publiusr]

Something to do as a very long term art project--have a series of ever smaller asteroids make ever smaller craters.