Pluto's perihelion libration is enabled by the orbit-averaged secular perturbations of Jupiter, Saturn, and Uranus, which raise the critical k² from about 0.30 to above Pluto's 0.87.
A deep analysis for New Horizons' KBO search images
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abstract
Observation datasets acquired by the Hyper Suprime-Cam (HSC) on the Subaru Telescope for NASA's New Horizons mission target search were analyzed through a method devised by JAXA. The method makes use of Field Programmable Gate arrays and was originally used to detect fast-moving objects such as space debris or near-Earth asteroids. Here we present an application of the method to detect slow-moving Kuiper Belt Objects (KBOs) in the New Horizons target search observations. A cadence that takes continuous images of one HSC field of view for half a night fits the method well. The observations for the New Horizons Kuiper Belt Extended Mission (NH/KEM) using HSC began in May 2020, and are ongoing. Here we show our result of the analysis of the dataset acquired from May 2020 through June 2021 that have already passed the proprietary period and are open to the public. We detected 84 KBO candidates in the June 2020 and June 2021 datasets, when the observation field was close to opposition.
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Libration of Pluto's argument of perihelion and the role of the major planets
Pluto's perihelion libration is enabled by the orbit-averaged secular perturbations of Jupiter, Saturn, and Uranus, which raise the critical k² from about 0.30 to above Pluto's 0.87.