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Comet P/Holmes (17P) "The massive ejection seen.
Extra data below the image. North Top - East Left.

It reminds me to look at, of a binary star where the primary is stripping material off a white dwarf star.
Mind you it is actually the opposite. I believe perhaps a huge gas bubble has been ejected or part of the
nucleus has broken off perhaps so to speak. Some explosive force, or Impact !
Observatory COD J93
OBS John Fletcher
CCD 21.42' x 15.95'
Pixel width 23.2 mm
Pixel height 22.4 mm
Focal length 1400.00mm
Regards John.