TY - JOUR
T1 - Physical Characterization of 2015 JD1
T2 - A Possibly Inhomogeneous Near-Earth Asteroid
AU - López-Oquendo, Andy
AU - Trilling, David E.
AU - Gustafsson, Annika
AU - Virkki, Anne
AU - Rivera-Valentín, Edgard G.
AU - Granvik, Mikael
AU - Chandler, Colin Orion
AU - Chatelain, Joseph
AU - Taylor, Patrick
AU - Fernanda-Zambrano, Luisa
N1 - Funding Information:
This work was supported in part by the Arizona Board of Regents, Arizona’s Technology and Research Initiative Fund, and NASA grant No. NNX15AF81G to D.E.T. These results made use of the Lowell Discovery Telescope (LDT) at Lowell Observatory. The LDT is localized on homelands sacred to Native Americans. We thank them for allowing part of their sacred lands to be used for astronomical research. Lowell is a private, nonprofit institution dedicated to astrophysical research and public appreciation of astronomy and operates the LDT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University, and Yale University.
Funding Information:
This material is supported in part by the National Science Foundation Graduate Research Fellowship Program under grants No. 2021318193 to A.J.L.O. and No. 2018258765 to C.O.C. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
Funding Information:
Part of this work was done at the Arecibo Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by the University of Central Florida, Yang Enterprises, Inc., and Universidad Metropoli-tana. The Arecibo Planetary Radar Program is supported by NASA grants 80NSSC19K0523 and NNX13AQ46G through the Near-Earth Object Observations program.
Funding Information:
This work was supported in part by the Arizona Board of Regents, Arizona’s Technology and Research Initiative Fund, and NASA grant No. NNX15AF81G to D.E.T. These results made use of the Lowell Discovery Telescope (LDT) at Lowell Observatory. The LDT is localized on homelands sacred to Native Americans. We thank them for allowing part of their sacred lands to be used for astronomical research. Lowell is a private, nonprofit institution dedicated to astrophysical research and public appreciation of astronomy and operates the LDT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University, and Yale University. The Near-Infrared High Throughput Spectrograph was funded by NASA award No. NNX09AB54G through its Planetary Astronomy and Planetary Major Equipment programs. The Large Monolithic Imager was built by Lowell Observatory using funds provided by the National Science Foundation (AST-1005313). Part of this work was done at the Arecibo Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by the University of Central Florida, Yang Enterprises, Inc., and Universidad Metropolitana. The Arecibo Planetary Radar Program is supported by NASA grants 80NSSC19K0523 and NNX13AQ46G through the Near-Earth Object Observations program. This material is supported in part by the National Science Foundation Graduate Research Fellowship Program under grants No. 2021318193 to A.J.L.O. and No. 2018258765 to C.O.C. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
Funding Information:
The Near-Infrared High Throughput Spectrograph was funded by NASA award No. NNX09AB54G through its Planetary Astronomy and Planetary Major Equipment programs. The Large Monolithic Imager was built by Lowell Observatory using funds provided by the National Science Foundation (AST-1005313).
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/8/1
Y1 - 2022/8/1
N2 - The surfaces of airless bodies such as asteroids are exposed to many phenomena that can alter their physical properties. Bennu, the target of the OSIRIS-REx mission, has demonstrated how complex the surface of a small body can be. In 2019 November, the potentially hazardous asteroid 2015 JD1 experienced a close approach of 0.033 1 au from the Earth. We present results of the physical characterization of 2015 JD1 based on ground-based radar, spectroscopy, and photometric observations acquired during 2019 November. Radar polarimetry measurements from the Arecibo Observatory indicate a morphologically complex surface. The delay-Doppler images reveal a contact binary asteroid with an estimated visible extent of ∼150 m. Our observations suggest that 2015 JD1 is an E-type asteroid with a surface composition similar to aubrites, a class of differentiated enstatite meteorites. The dynamical properties of 2015 JD1 suggest that it came from the ν6 resonance with Jupiter, and spectral comparison with major E-type bodies suggests that it may have been derived from a parental body similar to the progenitor of the E-type (64) Angelina. Significantly, we find rotational spectral variation across the surface of 2015 JD1 from the red to blue spectral slope. Our compositional analysis suggests that the spectral slope variation could be due to the lack of iron and sulfides in one area of the surface of 2015 JD1 and/or differences in grain sizes.
AB - The surfaces of airless bodies such as asteroids are exposed to many phenomena that can alter their physical properties. Bennu, the target of the OSIRIS-REx mission, has demonstrated how complex the surface of a small body can be. In 2019 November, the potentially hazardous asteroid 2015 JD1 experienced a close approach of 0.033 1 au from the Earth. We present results of the physical characterization of 2015 JD1 based on ground-based radar, spectroscopy, and photometric observations acquired during 2019 November. Radar polarimetry measurements from the Arecibo Observatory indicate a morphologically complex surface. The delay-Doppler images reveal a contact binary asteroid with an estimated visible extent of ∼150 m. Our observations suggest that 2015 JD1 is an E-type asteroid with a surface composition similar to aubrites, a class of differentiated enstatite meteorites. The dynamical properties of 2015 JD1 suggest that it came from the ν6 resonance with Jupiter, and spectral comparison with major E-type bodies suggests that it may have been derived from a parental body similar to the progenitor of the E-type (64) Angelina. Significantly, we find rotational spectral variation across the surface of 2015 JD1 from the red to blue spectral slope. Our compositional analysis suggests that the spectral slope variation could be due to the lack of iron and sulfides in one area of the surface of 2015 JD1 and/or differences in grain sizes.
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U2 - 10.3847/PSJ/ac7e4f
DO - 10.3847/PSJ/ac7e4f
M3 - Article
AN - SCOPUS:85142008860
SN - 2632-3338
VL - 3
JO - Planetary Science Journal
JF - Planetary Science Journal
IS - 8
M1 - 189
ER -