It has been designated as comet P/2010 A2 LINEAR but there is a lot of confusion over what exactly this thing is!
The Hubble didn't "discover" the comet, the X-shaped feature is a mystery but when it was discovered by LINEAR there was a lot of talk on comets-ml about what the "head-less" comet was.
I didn't know the Hubble was used to image it, obviously it's intrigue will last for a while!
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