A Caltech Library Service

Simulated SPHEREx spectra of asteroids and their implications for asteroid size and reflectance estimation

Ivezić, Željko and Ivezić, Vedrana and Moeyens, Joachim and Lisse, Carey M. and Bus, Schelte J. and Jones, Lynne and Crill, Brendan P. and Dorè, Olivier and Emery, Joshua P. (2022) Simulated SPHEREx spectra of asteroids and their implications for asteroid size and reflectance estimation. Icarus, 371 . Art. No. 114696. ISSN 0019-1035. doi:10.1016/j.icarus.2021.114696.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We describe the construction and analysis of simulated SPHEREx spectra of Main Belt and Trojan asteroids. SPHEREx will deliver the first all-sky spectral survey at 96 spectral channels between 0.75 µm and 5.0 µm. We have developed a method for correcting SPHEREx asteroid spectra for intrinsic rotational variability that does not require light curves and can enable studies before LSST light curves become available for this purpose. Using these spectra, we predict that SPHEREx will deliver meaningful flux measurements for about 100,000 asteroids, including close to 10,000 objects with high-quality spectra; this dataset will represent an increase over our current sample size by more than an order of magnitude. The main SPHEREx contribution to asteroid science will be derived from taxonomic classifications, detailed spectroscopic analyses involving a number of diagnostic spectral features associated with olivine, pyroxene, hydroxyl, water ice, and organics, and constraints on thermal properties. We argue that all asteroids with currently known orbits, about a million objects, should be included in the SPHEREx forced photometry object list to maximize its science impact. Our tools and the library of simulated spectra are made publicly available.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ivezić, Željko0000-0001-5250-2633
Ivezić, Vedrana0000-0001-5986-8929
Moeyens, Joachim0000-0001-5820-3925
Lisse, Carey M.0000-0002-9548-1526
Bus, Schelte J.0000-0003-4191-6536
Jones, Lynne0000-0001-5916-0031
Crill, Brendan P.0000-0002-4650-8518
Dorè, Olivier0000-0001-7432-2932
Emery, Joshua P.0000-0001-9265-9475
Additional Information:© 2021 Elsevier. Received 19 May 2021, Revised 21 August 2021, Accepted 3 September 2021, Available online 10 September 2021. J. Moeyens, L. Jones and Ž. Ivezić and acknowledge support from the University of Washington College of Arts and Sciences, United States, Department of Astronomy, and the DIRAC Institute. The DIRAC Institute is supported through generous gifts from the Charles and Lisa Simonyi Fund for Arts and Sciences, and the Washington Research Foundation, United States . C.M. Lisse, B.P. Crill, and O. Dore gratefully acknowledge support for their involvement in this work from the NASA SPHEREx project. Part of this work was done at Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Software. numpy (Oliphant, 2006), matplotlib (Hunter, 2007), scipy (Jones et al., 2001), astropy (Astropy Collaboration, 2013, Astropy Collaboration, 2018), astroML (VanderPlas et al., 2012), ATM (Moeyens et al., 2020).
Funding AgencyGrant Number
University of WashingtonUNSPECIFIED
Charles and Lisa Simonyi Fund for Arts and SciencesUNSPECIFIED
Washington Research FoundationUNSPECIFIED
Subject Keywords:Asteroids; Asteroids, surfaces; Near-Earth objects; Data reduction techniques
Record Number:CaltechAUTHORS:20210927-225706495
Persistent URL:
Official Citation:Željko Ivezić, Vedrana Ivezić, Joachim Moeyens, Carey M. Lisse, Schelte J. Bus, Lynne Jones, Brendan P. Crill, Olivier Doré, Joshua P. Emery, Simulated SPHEREx spectra of asteroids and their implications for asteroid size and reflectance estimation, Icarus, Volume 371, 2022, 114696, ISSN 0019-1035,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111075
Deposited By: George Porter
Deposited On:28 Sep 2021 14:47
Last Modified:28 Sep 2021 14:47

Repository Staff Only: item control page