應該是觀測後分類出 28個新的小行星家族
The NEOWISE team looked at about 120,000 main belt asteroids out of the approximately 600,000 known. They found that about 38,000 of these objects, roughly one third of the observed population, could be assigned to 76 families, 28 of which are new. In addition, some asteroids thought to belong to a particular family were reclassified.
http://www.nasa.gov/mission_pages/WISE/news/wise20130529.html