New Horizons is back in action after going quiet for a period of solar conjunction following the 1 January flyby of 2014 MU69 (informally nicknamed "Ultima Thule"). The spacecraft is returning new data, as exemplified by these images, shared this morning in a tweet by principal investigator Alan Stern. The pictures were taken before closest approach and don't add anything much in the way of news about the world, but: new images, woohoo!!!
NASA / JHUAPL / SwRI
Optical navigation images from New Horizons' approach to 2014 MU69
Four images taken on 31 December 2018 document the rotation and increasing apparent size of 2014 MU69 (informally nicknamed "Ultima Thule") to New Horizons. The top row shows the images as returned from the spacecraft. In the bottom row, the images have been "deconvolved," processed to correct for the known properties of the camera optics to reveal more detail. In all the images, the little world's binary shape, bright neck region, and mottled surface are clearly visible.
As New Horizons approached 2014 MU69 between 31 December 2018 at 20:00 UT and 1 January 2019 at 05:01 (UT), it captured a set of images to observe the little world's rotation. This movie includes 15 such images (as many as had been downlinked by 15 January) and covers about half a rotation as New Horizons closed from a distance of 500,000 to only 28,000 kilometers. Over that range, the image scale decreased from 2.5 kilometers per pixel to 140 meters per pixel.
The New Horizons team is sharing its data from the MU69 encounter relatively quickly after acquisition on the APL website. This is a montage of representative raw images, and is up-to-date as of 3 January 2019. Over time, as New Horizons returns more data, the sequence will be filled in.