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Red, Rough, Fast, and Perturbed: New Horizons Observations of KBO (15810) 1994 JR1 from the Kuiper Belt | | Simon B. Porter
; John R. Spencer
; Susan Benecchi
; Anne Verbiscer
; Amanda M. Zangari
; H. A. Weaver
; Tod R. Lauer
; Alex H. Parker
; Marc W. Buie
; Andrew F. Cheng
; Leslie A. Young
; Cathy B. Olkin
; Kimberly Ennico
; S. Alan Stern
; New Horizons Science Team
; | | Date: |
17 May 2016 | | Abstract: | The 3:2 resonant KBO (15810) 1994 JR1 was observed by NASA’s New Horizons
spacecraft on November 2, 2015 from a distance of 1.85 AU, and again on April
7, 2016 from a distance of 0.71 AU. Acquired using the LOng Range
Reconnaissance Imager (LORRI), these were the first close observations of any
KBO other than Pluto, and the first ever of a small KBO. Combining ground-based
and HST observations at small phase angles and the LORRI observations at higher
phase angles, we produced the first disk-integrated solar phase curve of a
typical KBO from alpha=0.6-58 degrees. Observations at these geometries,
attainable only from a spacecraft in the outer Solar System, constrain surface
properties such as macroscopic roughness and the single particle phase
function. 1994 JR1 has a rough surface with a 37+/-5 degree mean topographic
slope angle and has a relatively rapid rotation period of 5.47+/-0.33 hours.
1994 JR1 is currently 2.7 AU from Pluto; our astrometric points enable
high-precision orbit determination and integrations which show that it comes
this close to Pluto every 2.4 million years, causing Pluto to perturb 1994 JR1.
During the November spacecraft observation, the KBO was simultaneously observed
using the Hubble Space Telescope in two colors, confirming its very red
spectral slope. These observations have laid the groundwork for numerous
potential future distant KBO observations in the proposed New Horizons-Kuiper
Belt Extended Mission. | | Source: | arXiv, 1605.5376 | | Services: | Forum | Review | PDF | Favorites | |
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