Left: single 64-second exposure of Neptune in the BB-Ks band (2.182 μm), 2016-08-23T05:12:52.2635 UT August 23, 2016, revealing the satellites Proteus (P), Galatea (G), and Larissa (L). The frame is 5.39 × 5.92 arcsec² wide. The point source is due to a bad pixel cluster that is difficult to properly interpolate. Right: image of Neptune’s system obtained by co-adding 68 individual frames of the August 23, 2016, data (72 min and 32 s of total exposure time, between 04:24:50.5202 and 06:43:23.0627 UT). The frame is 6.99 × 6.99 arcsec² wide. We can see Proteus (P) and Larissa (L) along their respective orbits during this time interval. We can also see the trail of Galatea (G) and the arcs, which evolve along the much fainter Adams ring. The bright arc on the left is due to thermal electronic noise.