GeminiFocus July 2017 - Page 16

Figure 3. Rotational light curve of the largest fragment of P/2010 A2. Time- series g0-band photometry over two nights (upper panel) and phase based on the best-t double- peaked period of 11.36 hr (lower panel). A sine curve with a period of 11.36 hr was plotted in the upper panel (gray line). is targeting other clusters, dwarf galaxies, and individual stars in stellar streams. The pa- per is published in The Astrophysical Journal. Korean Astronomers Dissect a Fragmented Asteroid In January 2017, the active and fragmented main belt asteroid P/2010 A2 made its closest approach to the Earth after its 2010 discov- ery, when it exhibited a mysterious comet- like dust trail. Prior to this year’s passage, the fragments had not yet been characterized, due to the extremely small size (~ 120 meters in diameter) and faintness of this object. According to Kim, a variety of hypotheses could explain the history of this body, in- cluding rota