S/2010 J 1 is now known to be circling Jupiter at a average didtance of 14.57 million miles. This takes it 2.02 earth years to complete a lap aound it. Wile S/2010 J 2 only takes 1.69 earth years to go around Jupiter, at a average distance of 13.06 million miles.
“It was exciting to realize that this [S/2010 J 2] is the smallest moon in the solar system that was discovered and tracked from Earth,” said co-author Mark Alexandersen, of the University of British Columbia, in a statement.
Jupiter is surrounded by 50 main moon that have names, and at least 14 smaller provisional moons that are known only by their numbers.
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