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Amazing image.
The Ultra-Compact Dwarf (UCD) galaxy is extremely obvious!
This new type of object was only first described in the year 2000, though there is some dispute as to who noticed them first..... and when.
"ultra-compact dwarf" is the exact way that the discoverers usually refer to these objects. But I suppose the dash in the name is somewhat unnecessary.
At least, the publication in the scientific literature, as a new type of galaxy, dates to the year 2000.
The newness of this discovery should make us aware that deep amateur images like Rolf's could well be hiding other surprises!
Here is a paper on UCD galaxies, illustrating how they compare to globular clusters and dwarf spheroidal galaxies:
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