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Asteroid Polarimetric Phase Behavior in the Near-infrared: S- and C-complex Objects

Masiero, Joseph R. and Tinyanont, S. and Millar-Blanchaer, Maxwell A. (2022) Asteroid Polarimetric Phase Behavior in the Near-infrared: S- and C-complex Objects. Planetary Science Journal, 3 (4). Art. No. 90. ISSN 2632-3338. doi:10.3847/psj/ac6342.

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We present the first results of our survey of asteroid polarization phase curves in the near-infrared J and H bands using the WIRC+Pol instrument on the Palomar 200-inch telescope. We confirm through observations of standard stars that WIRC+Pol can reach the 0.1% precision needed for asteroid phase curve characterization, and we show that C-complex asteroids could act as an alternate calibration source, as they show less wavelength variation than stellar polarized standards. Initial polarization phase curve results for S-complex asteroids show a shift in behavior as a function of wavelength from visible to near-infrared bands, extending previously observed trends. Full near-infrared polarization phase curve characterization of individual asteroids will provide a unique constraint on surface composition of these objects by probing the wavelength dependence of albedo and index of refraction of the surface material.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Masiero, Joseph R.0000-0003-2638-720X
Tinyanont, S.0000-0002-1481-4676
Millar-Blanchaer, Maxwell A.0000-0001-6205-9233
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 February 11; revised 2022 March 28; accepted 2022 March 29; published 2022 April 22. The authors would like to thank the Palomar staff for their dedicated support and assistance that enabled our WIRC+Pol observing runs, especially as the COVID-19 pandemic upended regular operating procedures. We also thank the referees for their comments and suggestions that improved this paper. Based on observations obtained at the Hale Telescope, Palomar Observatory, as part of a continuing collaboration between the California Institute of Technology, NASA/JPL, Yale University, and the National Astronomical Observatories of China. This research made use of Photutils, an Astropy package for detection and photometry of astronomical sources (Bradley et al. 2019).
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:Asteroids; Asteroid surfaces; Polarimetry
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Asteroids (72); Asteroid surfaces (2209); Polarimetry (1278)
Record Number:CaltechAUTHORS:20220610-116180700
Persistent URL:
Official Citation:Joseph R. Masiero et al 2022 Planet. Sci. J. 3 90
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115125
Deposited By: Tony Diaz
Deposited On:10 Jun 2022 19:13
Last Modified:13 Jun 2022 16:46

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