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Nearly ten years after its launch, the New Horizons spacecraft will reach its closest encounter with Pluto on July 14, 2015. NASA and the world science community will celebrate the landmark at the Applied Physics Laboratory (APL) at Johns Hopkins University, as well as at “PlutoPalooza” events around the world.
Three months ago, I posted an article explaining what to expect during the flyby. This is a revised version of the same post, with some errors corrected, the expected sizes of Nix and Hydra updated, and times of press briefings added.
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.
New Horizons—what will be NASA’s greatest success of 2015—was cancelled multiple times in its early life, and many times before that in its previous incarnations. A mission to Pluto was not inevitable, despite the overwhelming scientific and public excitement.
Casey is the public face of The Planetary Society's efforts to advance planetary exploration, planetary defense, and the search for life. He is a trusted expert in space policy and works to demystify the political and policy processes behind space exploration.
This photo combines a color image taken by New Horizons' Ralph MVIC instrument with a LORRI image taken near the same time. It is an enhanced color image, featuring infrared, red, and blue channels. It was taken at a distance of 137,000 kilometers on 1 January 2019 at 04:08 UT, slightly more than an hour before closest approach. Note the reduced red coloring at the neck of the object.
Binary systems formed when aggregates of pebbles accreted into separated binaries under the force of gravity. Eventually, the orbit destabilized and the two pieces came into contact at a very slow speed of 80 centimeters per second or so.
Just over 24 hours before its closest approach to Kuiper Belt object 2014 MU69, New Horizons sent back the first images that began to reveal its shape. The original images have a pixel size of 10 kilometers not much smaller than Ultima’s estimated size of 30 kilometers, so the object is only about 3 pixels across (left panel). However, image-sharpening techniques combining multiple images show that it is elongated, perhaps twice as long as it is wide (right panel). This shape roughly matches the outline of 2014 MU69's shadow that was seen in observations of the object passing in front of a star made from Argentina in 2017 and Senegal in 2018.